Malicious PDF — malware analysis report

Static analysis result for SHA-256 2781832e5fe1ebfe…

MALICIOUS

PDF

75.7 KB Created: 2021-06-02 11:05:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: febf7dbf23ea347728fb2c001f12fa9d SHA-1: ae9a21927fbef0d16a2f0bac4910fb16f13efcf4 SHA-256: 2781832e5fe1ebfe7d86f9cba3e53aef1cf0288c6db1a0f10cbbda84c21454cb
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9998

Heuristics 5

  • 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 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://bologen.ru/123?utm_term=android+google+maps+offline+sd+card PDF link annotation
    • https://gexemuxu.weebly.com/uploads/1/3/5/3/135394015/vekejarizezevet_jawuzovapu_joguxopexalig.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410216/normal_600e373dc9a01.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366982/normal_600beff6e4380.pdfIn PDF document text
    • https://rubasabavajexo.weebly.com/uploads/1/3/6/0/136028040/vufufaxoz.pdfIn PDF document text
    • https://digavonuvuveg.weebly.com/uploads/1/3/4/8/134851043/4df95023c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425915/normal_606593bc102a3.pdfIn PDF document text
    • https://xukoperupe.weebly.com/uploads/1/3/4/7/134743664/rutokavalegijinixef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481663/normal_60433fbd2e542.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367643/normal_600d5416235a2.pdfIn PDF document text
    • https://kowojifab.weebly.com/uploads/1/3/4/6/134622532/5819900.pdfIn PDF document text
    • https://punotajevi.weebly.com/uploads/1/3/4/2/134266109/gejavepamuboz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427097/normal_5fdafd7b4e519.pdfIn PDF document text
    • https://fiwisiroveton.weebly.com/uploads/1/3/4/3/134339953/3913322.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pefagisunel.pbworks.com/w/file/fetch/144490158/18341514154.pdfIn PDF document text
    • http://bemulopawed.pbworks.com/w/file/fetch/144444597/jogudefu.pdfIn PDF document text
    • http://rasovuxosew.pbworks.com/w/file/fetch/144431730/tutuxafitefemunutusakasav.pdfIn PDF document text
    • http://mizunebapod.pbworks.com/f/31870553832.pdfIn PDF document text
    • http://fokopaviwu.pbworks.com/w/file/fetch/144475905/terzaghi_bearing_capacity_factors_formula.pdfIn PDF document text
    • http://wotasaful.pbworks.com/w/file/fetch/144456132/strategic_human_resource_management_anna_university_notes.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB7C 5464 bytes
SHA-256: cfa9290fb00382115f82e0c8942422bafa1429890879ab44dda2f99567b7f996
font_01_sfnt_off0000fdfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDFD 10480 bytes
SHA-256: dc7c5a5aca8ab2787c8b1d74a8ee2ac25637393615618daa0eb4c84c5472a154

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