Malicious PDF — malware analysis report

Static analysis result for SHA-256 8413f3ae0e17273f…

MALICIOUS

PDF

86.4 KB Created: 2021-06-12 01:10:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8b0e961ad420b4360e035edf2e109a04 SHA-1: 763308a0deb8f16d77c791defa3a4682b7162a71 SHA-256: 8413f3ae0e17273f7126b6af116b224d6f0b2b8a49f2bdaa5824b13c31efc38d
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains numerous external links, with the primary URL being ketchas.ru, suggesting a phishing or malware distribution campaign. The PDF structure also indicates a link farm, likely intended to host or redirect to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://ketchas.ru/pbw?utm_term=gta+treasure+hunt+map
    • https://kuwuxezito.weebly.com/uploads/1/3/6/0/136090431/4599782.pdf
    • https://static.s123-cdn-static.com/uploads/4369653/normal_5ff9b6de148ba.pdf
    • https://cdn-cms.f-static.net/uploads/4477401/normal_60c1831864907.pdf
    • https://static.s123-cdn-static.com/uploads/4367299/normal_5ff66bcfaa4b1.pdf
    • https://cdn-cms.f-static.net/uploads/4479237/normal_5fd12856149d7.pdf
    • https://cdn-cms.f-static.net/uploads/4383804/normal_603169f9af92f.pdf
    • https://cdn-cms.f-static.net/uploads/4385847/normal_6052b1ff8f58c.pdf
    • https://lomekizawulom.weebly.com/uploads/1/3/4/7/134704223/8551547.pdf
    • https://static.s123-cdn-static.com/uploads/4379723/normal_5fc8d4eea3bdd.pdf
    • https://vewudati.weebly.com/uploads/1/3/0/8/130873955/gugeruzujiwoxu.pdf
    • https://static.s123-cdn-static.com/uploads/4495999/normal_5fffeb0268329.pdf
    • https://boziwigezuzes.weebly.com/uploads/1/3/5/9/135984517/tidewiligomeni.pdf
    • https://kuxobemif.weebly.com/uploads/1/3/1/3/131379353/welafajed_zinuma.pdf
    • https://luradubesi.weebly.com/uploads/1/3/4/4/134486829/dutal.pdf
    • https://cdn-cms.f-static.net/uploads/4375884/normal_605b8b94eb86e.pdf
    • https://cdn-cms.f-static.net/uploads/4501204/normal_606b48a2738db.pdf
    • https://cdn-cms.f-static.net/uploads/4377115/normal_606c2a6564eae.pdf
    • https://cdn-cms.f-static.net/uploads/4414358/normal_5fe929dff0293.pdf
    • https://tiwebusimevadeb.weebly.com/uploads/1/3/5/3/135346158/vurim_kunawig_gobuduwa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://ronefete.pbworks.com/f/povetomedukuxubifagu.pdf
    • http://poforezufovu.pbworks.com/f/cannizzaro_reaction_with_formaldehyde.pdf
    • http://zobafolu.pbworks.com/f/20002885643.pdf
    • http://lururefisu.pbworks.com/f/85250016153.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_off00010dce.bin
5d8fd735d5c2f6461cfde34d554bc2ec900ec52a25772603e6569ee5205a9128		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10DCE 5060 bytes
font_01_sfnt_off00011ed4.bin
78f8590154f89b4ee5671acf194c8fa7198b6fd38d5d95ee0d56af9d017519c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11ED4 13512 bytes

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