Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ef986b188d22abd…

MALICIOUS

PDF

68.2 KB Created: 2020-11-24 13:43:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5eba2687442dc619c58b98b9e28d22fb SHA-1: d2d02b2cefd8006c6336f0a22fc09b23286093f6 SHA-256: 4ef986b188d22abd21e8497f9e03dba6ba6424d4d38b28d9851b11659d061ac4
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains a large number of external links, many pointing to Weebly-hosted PDF files, suggesting a link farm or SEO abuse. The document body, though heavily corrupted, contains metadata related to algebra answer keys, likely a lure to attract clicks. No scripts were extracted, but the PDF structure itself facilitates the redirection to these external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://traffset.ru/123?utm_term=all+things+algebra+answer+key+2015+unit+1
    • https://fibovasononeboj.weebly.com/uploads/1/3/4/7/134732795/jasesuxikofunadow.pdf
    • https://vidojibirulon.weebly.com/uploads/1/3/1/0/131070792/zosuxavotojo.pdf
    • https://nebegozanukasaz.weebly.com/uploads/1/3/4/6/134699913/fubifisuwak.pdf
    • https://raboxodibol.weebly.com/uploads/1/3/4/0/134096122/ponawapedefuma.pdf
    • https://cdn-cms.f-static.net/uploads/4410000/normal_5f9a479868a12.pdf
    • https://jerefukixuludew.weebly.com/uploads/1/3/4/6/134686450/somuke.pdf
    • https://sisodiwitamusoz.weebly.com/uploads/1/3/2/6/132681746/xepadazasu.pdf
    • https://pijafajabivigin.weebly.com/uploads/1/3/4/6/134635516/7960408.pdf
    • https://dugizixenopiloj.weebly.com/uploads/1/3/4/4/134457585/f3532e5.pdf
    • https://cdn-cms.f-static.net/uploads/4488817/normal_5fb3c5e9c8436.pdf
    • https://gimejexoxixaza.weebly.com/uploads/1/3/1/8/131872185/monirafulowafix.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/e50bd2c3-4ca9-4bbe-85f3-790357a429b9/nigonelunoj.pdf
    • https://uploads.strikinglycdn.com/files/ac1a7080-46c9-4c78-8ceb-c0de73250204/75015563245.pdf
    • https://uploads.strikinglycdn.com/files/a3ccc5ab-b72c-4272-94ac-21833243e5ab/somonerifuzobune.pdf
    • https://uploads.strikinglycdn.com/files/590bf173-d211-4f58-b54e-614d7d2cef21/mixed_second_and_third_conditionals.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc59.bin
f0067dd0aa6dd64aab3a4d5a58461f0feb690a10fc5599b708865b507acf7a19		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCC59 5784 bytes
font_01_sfnt_off0000e026.bin
ce0589fb9a31ab68443ba428eab1a45ed8074c3e3dc1b02c619cbc66f96c9e68		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE026 10512 bytes

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