Malicious PDF — malware analysis report

Static analysis result for SHA-256 b78404d5fe8f5df2…

MALICIOUS

PDF

76.2 KB Created: 2020-11-10 07:48:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 60c486408804277c1426f9b910323ad2 SHA-1: b9a20db35c975601bf782b7d0208cb24f93c4af9 SHA-256: b78404d5fe8f5df230c16fd6139aa8294a06e6922daaada89af9631d83448db0
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, suggesting a phishing or SEO poisoning attempt. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful content.

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?keyword=8th+grade+spanish+book
    • https://cdn-cms.f-static.net/uploads/4370777/normal_5f8deffdcf7fa.pdf
    • https://cdn-cms.f-static.net/uploads/4417652/normal_5f9c965d5961a.pdf
    • https://cdn-cms.f-static.net/uploads/4381976/normal_5f90c86f6c6fb.pdf
    • https://cdn-cms.f-static.net/uploads/4410952/normal_5fa4a3b53805f.pdf
    • https://bugusurev.weebly.com/uploads/1/3/4/6/134615575/molejugab.pdf
    • https://cdn-cms.f-static.net/uploads/4366369/normal_5f9335fc8a93e.pdf
    • https://xamorefozinibir.weebly.com/uploads/1/3/4/6/134643183/348911.pdf
    • https://cdn-cms.f-static.net/uploads/4413112/normal_5f9d1764cce46.pdf
    • https://cdn-cms.f-static.net/uploads/4374360/normal_5f97e76309d2c.pdf
    • https://cdn-cms.f-static.net/uploads/4446147/normal_5fa9c588d1876.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/1fbbdf68-3f0d-402b-95ae-f70de8cfa5cc/battery_operated_chandelier_for_gazebo.pdf
    • https://uploads.strikinglycdn.com/files/59aab4ef-dc25-4428-984f-2f7e4fdd373e/54906900723.pdf
    • https://s3.amazonaws.com/rovotafavap/soul_eater_manga_free.pdf
    • https://s3.amazonaws.com/kufazete/tekirujoj.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_off0000eb1e.bin
84282b9f3de06ffd08d372acc9c9666357c5a4097222db57b70f5b2ceb1c1dda
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB1E 5492 bytes
font_01_sfnt_off0000fdb5.bin
d97ace4e423031487d59035126c08b908f452f07e125063fc675fde65b6800c4
pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB5 10888 bytes