Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ab718f8d79a1e64…

MALICIOUS

PDF

66.5 KB Created: 2020-11-11 05:05:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: f0da8eeade32aed0d999c9db65fea877 SHA-1: 21f33cd0383998a837513216f9a9132574349170 SHA-256: 7ab718f8d79a1e640584a12d798427f3c1b36a89fe21071c76f813d97fd2184b
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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://traffnew.ru/strik?keyword=wanda+atv+tires+p341 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4415302/normal_5f9a2efead0e3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383925/normal_5f91cbc8ee058.pdfIn PDF document text
    • https://falibapop.weebly.com/uploads/1/3/3/9/133997194/sivag.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409396/normal_5faa1c2221c78.pdfIn PDF document text
    • https://taruzabob.weebly.com/uploads/1/3/4/4/134493447/sutekin_remikijojozagix_vabutigegakog_tiwumobojekepix.pdfIn PDF document text
    • https://wefamojugibe.weebly.com/uploads/1/3/1/1/131164519/ebb6fa87afd6f50.pdfIn PDF document text
    • https://mabamakozipapap.weebly.com/uploads/1/3/4/3/134315796/97082e103c.pdfIn PDF document text
    • https://bajukurufutot.weebly.com/uploads/1/3/4/5/134525313/lalezo_zapovazem.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zarusegibitumet/curso_de_ingls_avanzado.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8d915af-0eab-430a-b8a8-9c5516c83575/wolf_spider_dnd_5e.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad0c4cf9-115c-40d6-98a2-cc743d8ee2c0/42563295841.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5bf6d28b-0a7e-4752-8dfd-fa68e8da8245/radically_open_dbt_skills_training_manual.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_off0000c710.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC710 5296 bytes
SHA-256: 12fe99ab988163417fbfc2480654e916faaa393d493ea7812a2c5ee6945fccb4
font_01_sfnt_off0000d941.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD941 10748 bytes
SHA-256: 92b8ef7c793469ac5002070de8bfe433efbdc684b669a81b299e59167933d537

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