Malicious PDF — malware analysis report

Static analysis result for SHA-256 e772fe8e9b863499…

MALICIOUS

PDF

94.2 KB Created: 2021-05-31 03:01:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: e0dfadd388ac5cfaab6eccd8aeca13f2 SHA-1: d8f7dbe01c01fcb5c54404e7a7b39ef6505274ad SHA-256: e772fe8e9b86349937923cdd980f01d8d4bc0d7f22e6fc6045f08b7c751b9d7b
186 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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://xajibur.ru/strik?utm_term=hofstadter+anti-intellectualism+in+american+life+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4413004/normal_60144a00258a0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457592/normal_606bbc104e198.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378830/normal_6042e0b46c8aa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501364/normal_5fdfa5f3c00f2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414332/normal_5fe93943bc215.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384155/normal_605baa1a07495.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408701/normal_5fd3319f0fe1c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409814/normal_5fc70191c6bf9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413578/normal_5fd386a0d1615.pdfIn PDF document text
    • https://manoduxasef.weebly.com/uploads/1/3/4/0/134041035/vadifevobiligefo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408483/normal_604af5477748e.pdfIn PDF document text
    • https://waluxine.weebly.com/uploads/1/3/4/7/134759732/1d03c5477d1f01.pdfIn PDF document text
    • https://kuvovoturuja.weebly.com/uploads/1/3/5/3/135322548/nofujasewo-dokiwedapipova-xeloj-fadibevijomeni.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446017/normal_604ed31455afa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488141/normal_600d953d6873a.pdfIn PDF document text
    • https://wuwudaxu.weebly.com/uploads/1/3/4/4/134493329/1146060.pdfIn PDF document text
    • https://domexuvuk.weebly.com/uploads/1/3/0/7/130740212/369c0a65.pdfIn PDF document text
    • https://figiroxofidun.weebly.com/uploads/1/3/0/7/130740151/9fc7c49b2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374698/normal_606e1edddf1ac.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468550/normal_60001546cd0e3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off00013309.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13309 5296 bytes
SHA-256: ee25d81d998453bb901bf319bf3470998bb3f8efe52ec5dc994f78e663bc2e0a
font_01_sfnt_off000144ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144FF 11204 bytes
SHA-256: 8e95127f1c12590d3c97dd079a61fb38cf396f788cb2347571cf67ed8c492d55

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