Malicious PDF — malware analysis report

Static analysis result for SHA-256 4965df7d42e4272f…

MALICIOUS

PDF

63.0 KB Created: 2021-02-15 20:46:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: c4ed82aa680a9f3ff44cad8ceb10b1af SHA-1: e5c27a25810de014f3006d509ae73ecf17f2b3ab SHA-256: 4965df7d42e4272f8e4fad20d15e1266fb23935bb306ae9ee93f3992314b3967
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 5

  • 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 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://jottigo.ru/strik?utm_term=zojirushi+bb-cec20+parts PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4483870/normal_5fcdecdb52b5f.pdfIn PDF document text
    • https://cdn.sqhk.co/lexoxuxoluvi/gjdhgcs/29415624963.pdfIn PDF document text
    • https://gekitudofu.weebly.com/uploads/1/3/4/4/134403565/5727336.pdfIn PDF document text
    • https://lekevemu.weebly.com/uploads/1/3/0/7/130776436/pexuguw-molabed-garomavoraz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448535/normal_5ff4284020015.pdfIn PDF document text
    • https://cdn.sqhk.co/figegixo/njgLuGT/77508970586.pdfIn PDF document text
    • https://talogaxuzule.weebly.com/uploads/1/3/4/5/134596774/xavukose.pdfIn PDF document text
    • https://vamubediva.weebly.com/uploads/1/3/4/9/134901044/0dba2f03c4123.pdfIn PDF document text
    • https://cdn.sqhk.co/kunimanujage/BHjgjiN/ion_water_rocker_party_speaker_review.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://forawoxo.epizy.com/eclipse_python_windows_7.pdfIn PDF document text
    • http://silinodev.rf.gd/anstoss_2_gold_free.pdfIn PDF document text
    • http://nareboveridur.epizy.com/wish_you_happy_birthday_cake_photos.pdfIn 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_off0000b95d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB95D 5468 bytes
SHA-256: f6d7d7d397743b2aa0917a1003651f09f1ac1af869591e2437a52b028558cefe
font_01_sfnt_off0000cbfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBFC 10488 bytes
SHA-256: 148bc4be3efab713858c7dc95b1b856f9a1e2a40da910c2b4920ed85fbe10b53

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