Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e573499b6a57378…

MALICIOUS

PDF

100.5 KB Created: 2021-06-09 08:57:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 6f8654cf2ae21a3c6fc0cf1c738cb755 SHA-1: 3c12a77c30d69098f08a438288bf324c723db13b SHA-256: 3e573499b6a57378ab655112e6b0d4dc6dd69fc28ab9d979e9e86fec59227398
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous external links, characteristic of a link farm designed to redirect users to malicious sites. The heuristic PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM indicate a large number of links hosted on disposable domains, suggesting an attempt to obscure the true malicious destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9810

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://inwebjor.ru/pbw?utm_term=math+book+of+class+9+pdf PDF link annotation
    • https://xekekulok.weebly.com/uploads/1/3/1/8/131857590/sisonemegi-mefem-wodojavebuge-kutabogesikutow.pdfIn PDF document text
    • https://nazugawexavidi.weebly.com/uploads/1/3/4/6/134678572/zevutabizumoze.pdfIn PDF document text
    • https://sofirutowik.weebly.com/uploads/1/3/1/3/131381411/kureduxi-guleximusupatos.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468553/normal_600993dbcb542.pdfIn PDF document text
    • https://xififaxapid.weebly.com/uploads/1/3/4/3/134344339/3725352.pdfIn PDF document text
    • https://figurera.weebly.com/uploads/1/3/4/4/134437403/e6e5f6a.pdfIn PDF document text
    • https://wekegakusujesal.weebly.com/uploads/1/3/4/2/134266445/fabuviru.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491725/normal_602ab49acd683.pdfIn PDF document text
    • https://mojabizozawobe.weebly.com/uploads/1/3/4/6/134699592/9893826.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377100/normal_600e4623ef28d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474752/normal_5feb749b9040c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419003/normal_5fdf335abc178.pdfIn PDF document text
    • https://sifumoxijobobo.weebly.com/uploads/1/3/4/4/134493963/f2972349763.pdfIn PDF document text
    • https://gaxezoxo.weebly.com/uploads/1/3/0/7/130776828/cf1877d7d84.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/ebe758df-5267-4c85-a47f-a0bd69e3a5a7/team_fortress_2_hat_generator_v5_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/48ecd31e-069c-4ad0-ab4f-6b8352d21bf0/how_to_refill_polaroid_film.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b20585b1-7c7f-42ad-96d9-35e00141471b/greek_mythology_edith_hamilton_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0e92f9b-c2c9-4f23-be86-c27447741a8c/20728648806.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d36dbb9d-6e22-4953-afec-0ca4ff785873/can_android_phones_play_imessage_games.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ecb5fff5-9f55-4e1d-ae50-fdf6f609292a/63655341145.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc00b397-96ee-4296-a485-6f97336fa467/rakojoguvaxowiruzediw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34180083-7b8c-4089-a022-bcc5cab0bb16/86713204129.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51087496-ce2b-4e59-9ec9-d6e472a7ef79/landlord_apartment_walkthrough_checklist.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e945535b-a749-40f0-a258-aa51f78f3a5e/lesojelenoxegivi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a382abe-66e1-496d-8b69-7b856c6b1ebd/zulexiluturexokines.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4fa718d4-d062-42fc-919a-d2079c1ad07c/linux_shell_script_command_line_arguments_example.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3AF 5028 bytes
SHA-256: 88a65d9ccf892527934cadf6c866ef201af338dc9e0f99fdf651a5dce0601f2b
font_01_sfnt_off000104cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104CB 16480 bytes
SHA-256: c0bffb4362ab894ab22b0502714d13e84bc285fb969b92729777841aaa68388f
font_02_sfnt_off0001370f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1370F 11040 bytes
SHA-256: 6645dd7dab7389ef98c1064b228a32b1d7f9b2c73be361225597ac9c4693df62
font_03_sfnt_off00015d2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D2F 16384 bytes
SHA-256: a8f82ce1cdc57d6cf73caeb35ba0a534b8f114798d4dfc5d6ed82df03316e49d
font_04_sfnt_off000172f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x172F8 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176