Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff257d7db472cb4e…

MALICIOUS

PDF

118.7 KB Created: 2021-04-02 23:55:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 74bc0a064adc59d925371176c4d5074e SHA-1: 3ce4cba5d207824b0c44502c4c2dc4370ecf7dfe SHA-256: ff257d7db472cb4e588223bfa5e01e6128fcda13ec6295abf1dddbcecd4d7f00
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting, suggesting a link farm or SEO spam operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://druttle.ru/award?keyword=asterix+i+obelix+komiksy+pdf PDF link annotation
    • https://tawusizigegik.weebly.com/uploads/1/3/3/9/133997505/lebojabanomevifosopa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366633/normal_5fe8d1b5c81c4.pdfIn PDF document text
    • https://xemegejimeje.weebly.com/uploads/1/3/1/6/131636808/nozaza_nakerowidaz_gesomudodo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379473/normal_6027ff738811b.pdfIn PDF document text
    • https://guwiretaxuzaji.weebly.com/uploads/1/3/4/6/134687660/e500d0c3f72b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404515/normal_6006274e9e5f8.pdfIn PDF document text
    • https://cdn.sqhk.co/luwesefizi/Shiigog/juwuzivajizupujubiwurego.pdfIn PDF document text
    • https://cdn.sqhk.co/wudawagirus/eSNidjb/losuvima.pdfIn PDF document text
    • https://tewiwumorivare.weebly.com/uploads/1/3/1/4/131409909/pewapuzavabiwe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379605/normal_5ff8fe3880be0.pdfIn PDF document text
    • https://cdn.sqhk.co/dajusonas/hidpgeM/granny_horror_map_for_minecraft_pe.pdfIn PDF document text
    • https://vevatujiv.weebly.com/uploads/1/3/1/4/131482893/pebatazukebuwabewak.pdfIn PDF document text
    • https://wilibuluso.weebly.com/uploads/1/3/6/0/136086636/fd980975.pdfIn PDF document text
    • https://demepeli.weebly.com/uploads/1/3/4/6/134632839/vekotixunuw_mufolegut_rogasaki_masikebebibip.pdfIn PDF document text
    • https://vujezogovi.weebly.com/uploads/1/3/5/3/135348950/cbf958fd826.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/2d15599c-97a5-4e11-9a93-f1f321d613a8/jawamubo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/340ad248-0792-488b-aae3-6554fed58cc1/lonely_planet_japan_2019_review.pdfIn PDF document text
    • https://s3.amazonaws.com/wuvepilamamuse/lupus_nephritis_management_guidelines_compared.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e74466aa-f9e7-483d-848c-4d64fceb6317/27180403652.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/300a7e20-dcc0-46cb-97aa-b5e5480645f3/how_to_install_poll_everywhere_in_powerpoint.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66dcf08e-e465-4030-b715-855a8fa6543e/is_push_pull_legs_good_for_fat_loss.pdfIn PDF document text
    • https://s3.amazonaws.com/sowirutelevolur/891734221.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://sinhala.sourceforge.net/In PDF document text
    • http://sinhala.cvs.sourceforge.net/viewvc/*checkout*/sinhala/sinhala/fonts/CREDITSIn PDF document text
    • http://www.gnu.org/licenses/gpl-2.0.htmlIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016db5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16DB5 5024 bytes
SHA-256: 550ea57bc460807b2c15a8be4b16fbec6dc87cb3329a3ca781b7e7f393ed6c02
font_01_sfnt_off00017e93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17E93 4348 bytes
SHA-256: 6c5e4ef0cb2f0ba33611e8bf95454a30a09c98bc4b3cdd5b6d4da305b73fe583
font_02_sfnt_off00018d50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18D50 15900 bytes
SHA-256: 9158bd8942d3640f824cc29499f0f8032b3965f14018ca1aa33b6690c906bfa1
font_03_sfnt_off0001bd59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BD59 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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