Malicious PDF — malware analysis report

Static analysis result for SHA-256 14be84b3a4250a3b…

MALICIOUS

PDF

67.4 KB Created: 2020-11-14 00:03:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 01e42f0aff80df69cbad174e43b281b1 SHA-1: dff930eafc767aa592e679f4c3145c99fb0bca23 SHA-256: 14be84b3a4250a3b3fbea4020db04080a6fc93f121b26fa6e66a2580a86c8cd3
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 0.9997

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://trafffe.ru/123?utm_term=what+is+a+dog+kennel+run PDF link annotation
    • https://tegugozitofo.weebly.com/uploads/1/3/0/8/130874592/815444.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409107/normal_5f9f5b2b7cbf1.pdfIn PDF document text
    • https://mabanopovofed.weebly.com/uploads/1/3/1/4/131453130/1881682.pdfIn PDF document text
    • https://wumotobu.weebly.com/uploads/1/3/4/3/134370577/vovusasemetiparab.pdfIn PDF document text
    • https://mumixopid.weebly.com/uploads/1/3/1/8/131872042/wujago-ruxakudo.pdfIn PDF document text
    • https://xogexemufak.weebly.com/uploads/1/3/1/4/131437987/f5938ae993d5266.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383568/normal_5f911a6b89c17.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/xanebavifamopez/reasoning_ability_questions_for_bank_exams.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4d21a90-c655-4a80-b66b-4a338a8fb235/tavijim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/80879548-e46b-4734-a7ce-847d6e4ae850/ruwaralokesovemademivaf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc76ce9a-8572-4436-87da-59c1b16e05ee/4440523357.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/902a713d-6e1e-4577-839d-10344fc6b62d/lezujume.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_off0000cdbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDBD 5164 bytes
SHA-256: 1fcca219827c69533d7f18e19bf1043ea98ff228bd0372d549ee428eef6f7fe8
font_01_sfnt_off0000df51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF51 9940 bytes
SHA-256: 711faac9e3b0eac8a465314e13c20b5c21ac6d4b7cf0a9a25c02c7dc521c5f80

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