Malicious PDF — malware analysis report

Static analysis result for SHA-256 85ba46289301620a…

MALICIOUS

PDF

69.3 KB Created: 2020-12-03 11:42:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: bbfa89fa4bc373a1b868236d7426dfe4 SHA-1: d17740e03f4d0aad5252caeeb368343a86a64db6 SHA-256: 85ba46289301620a68a0032ca701d1be95b0ada07a49cd9dfe736e97597c665c
194 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://trafffi.ru/aws?utm_term=%25E1%25BB%25A9ng+d%25E1%25BB%25A5ng+unikey+4.+0+rc2 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4446944/normal_5fa58d952077d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386081/normal_5f911223c1f36.pdfIn PDF document text
    • https://polirafula.weebly.com/uploads/1/3/4/5/134528493/2986822b.pdfIn PDF document text
    • https://dapunilak.weebly.com/uploads/1/3/4/5/134506399/69166a21b22e3.pdfIn PDF document text
    • https://sekorora.weebly.com/uploads/1/3/4/8/134856449/kepaxikuwelaf.pdfIn PDF document text
    • https://nukubutoti.weebly.com/uploads/1/3/2/3/132302768/sejewemivo_jusubebovoweda_xevotadarodebo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426701/normal_5fa74fc16649a.pdfIn PDF document text
    • https://wunimebi.weebly.com/uploads/1/3/4/3/134361225/kokabeketizozad.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/3408e864-027e-40fe-a58a-0a08a17dd0ac/sidixi.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0fd9af9866f3fd2d4d777/t/5fc13a51a97599144e24363f/1606498897587/kutumeker.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd265826-28f3-4ca0-9400-7573fe1c8415/leda_and_the_swan_poem.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe1f71e18c5c478ec479d7/1606295410384/3703079955.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2cde6573-4392-4495-b426-ce03a07d3274/woodward_academy_football_roster.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c8cfe4c-dceb-4127-944a-0da12c6df2ed/12880094706.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b601.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB601 5396 bytes
SHA-256: 4091f5829da6388b51b7a922acf5e4daeecc2288928d7000ca9a63b80b0cc46e
font_01_sfnt_off0000c866.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC866 13760 bytes
SHA-256: 99d73cecd61c27e73825d0fcc5556749b5aba87cf8c2b4f819ad6340b2f04a73
font_02_sfnt_off0000f0f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F4 16340 bytes
SHA-256: de4d8b2f57bd79f1a868fabda613d9936b110e31710edd4728466090b424b6ff

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