Malicious PDF — malware analysis report

Static analysis result for SHA-256 4915a75a649be57a…

MALICIOUS

PDF

153.2 KB Created: 2021-04-06 16:17:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 6e2cc7959647cc3650c5fc608d8fc968 SHA-1: 14872495ecabd87a74606609190023a657698887 SHA-256: 4915a75a649be57ac711a7f130d9042159c510bff3c5c0d49c05ef8fffed8e78
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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.
  • 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://fokemale.ru/strik?utm_term=pilgrim%2527s+progress+movie+2019 PDF link annotation
    • http://drenajkrasnodar.ru/how_to_make_a_secret_order_on_amazoni80n3.pdfIn PDF document text
    • http://nubolats.xyz/a_touch_of_class_limousine_marylandguq3z.pdfIn PDF document text
    • http://finipupote.mywebcommunity.org/the_old_man_and_the_sea_english_free_download.pdfIn PDF document text
    • http://tagaporigowekis.mygamesonline.org/benim_hocam_tyt_corafya_ders_notlar.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375070/normal_5fce6f9da4d88.pdfIn PDF document text
    • http://circulyarkadigital.xyz/gudulanawomevidawawupesainuv2.pdfIn PDF document text
    • http://ig-supportcenter.xyz/wiwelipodeti1nn5t.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425484/normal_604871535d437.pdfIn PDF document text
    • http://rusherx.studio/what_is_a_rare_genetic_disorder26irj.pdfIn PDF document text
    • http://italywom.space/negikiwzxx9z.pdfIn PDF document text
    • http://bitcoinov.site/denon_avr-x4200w_service_manual4f79c.pdfIn PDF document text
    • http://hydrofthol.space/why_wont_my_jazzy_chair_wont_chargew0wea.pdfIn PDF document text
    • http://prod-fruit.space/xivobev0pbv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492536/normal_60501f1094b77.pdfIn PDF document text
    • http://nemugub.mywebcommunity.org/zoxegogokogovedetevu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/muvazi/24140309531.pdfIn PDF document text
    • https://s3.amazonaws.com/satedafadusizo/rowovaxixisasedudipizavu.pdfIn PDF document text
    • https://s3.amazonaws.com/savukojubusum/poguzev.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001f084.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F084 6500 bytes
SHA-256: d87305001222918722232bffeaf6db57d9600ef0f419394a7c8cae9a06a45bd9
font_01_sfnt_off000206d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x206D2 5508 bytes
SHA-256: 2e986d4ffccdcbdc0478a8d30b45f0c7282976709599e89262032d6ad3a7d022
font_02_sfnt_off00021995.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21995 11720 bytes
SHA-256: 4e1dd9ed8a2a1b1de4dfbd080dcdec076d0589c2b9dba26698e137da1455922e
font_03_sfnt_off00024148.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24148 16204 bytes
SHA-256: 541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501