Malicious PDF — malware analysis report

Static analysis result for SHA-256 83cbe7d528114d1d…

MALICIOUS

PDF

67.6 KB Created: 2020-11-26 07:26:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e2e147c1e3b4e6399c1a9ba78c1b8ae8 SHA-1: d6fe0af1968a79c48d4e39e70129ffe39ee3929e SHA-256: 83cbe7d528114d1d8be30f747c5046420f661b879c58dc4f1fdc6f39c08f09e3
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and an ML classifier, specifically flagged for containing a large number of external links, characteristic of a link farm. The primary URL, https://trafffe.ru/123?utm_term=slim+x+genie+keto+shark+tank, suggests a potential phishing or scam attempt related to weight loss products. No scripts were extracted, but the PDF structure itself facilitates the redirection to these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://trafffe.ru/123?utm_term=slim+x+genie+keto+shark+tank
    • https://cdn-cms.f-static.net/uploads/4374951/normal_5f8ea772471a2.pdf
    • https://cdn-cms.f-static.net/uploads/4405430/normal_5f91b3701f3e1.pdf
    • https://cdn-cms.f-static.net/uploads/4454982/normal_5fa415414f31f.pdf
    • https://lodirunesu.weebly.com/uploads/1/3/0/8/130874391/gexenop.pdf
    • https://bumarotijij.weebly.com/uploads/1/3/4/6/134688095/rozadebutipibobizaka.pdf
    • https://cdn-cms.f-static.net/uploads/4418556/normal_5fa6985c886fe.pdf
    • https://newogofifexepe.weebly.com/uploads/1/3/4/8/134884114/vafogumiraseb_ferotuje_nogelujo.pdf
    • https://dedotomonifagax.weebly.com/uploads/1/3/1/6/131606429/241cd2f55e718e9.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/35cb0545-e564-4162-9c51-2f52e3ec19f4/75380870820.pdf
    • https://uploads.strikinglycdn.com/files/d791cfff-0553-446c-915c-a3bf8a849025/victory_motorcycle_salvage_parts.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_off0000ca78.bin
efa2acb433b66ee5270f58f47e1170b22f2e329e32991e88fdf8c3bd0497c298
pdf-font-stream PDF embedded font (sfnt) at offset 0xCA78 5332 bytes
font_01_sfnt_off0000dc71.bin
e266c9bbc8167b8995df8b1a4f354521a93eb3a56950f145a18c8bb8826bbfbf
pdf-font-stream PDF embedded font (sfnt) at offset 0xDC71 11160 bytes