Malicious PDF — malware analysis report

Static analysis result for SHA-256 81fd97e4f26544ec…

MALICIOUS

PDF

73.7 KB Created: 2021-03-01 05:18:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 834aee10499399b1fad97ea340377ebb SHA-1: eb937e74bd0f2dd736a812781dc1fd0d056f4028 SHA-256: 81fd97e4f26544ec7db5189155a98892e5bc2ea4f66c609c84b419caa4c679e6
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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://ponafet.ru/123?utm_term=books+like+the+opposite+of+loneliness PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4484358/normal_6016dbb2e7194.pdfIn PDF document text
    • http://detonic-official.website/okami_treasure_guidesa8qa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369183/normal_600206223bf77.pdfIn PDF document text
    • http://idealicaitalia-official.site/inverse_functions_homework_flamingo_math_answers8kx54.pdfIn PDF document text
    • https://cdn.sqhk.co/darojopul/eOTicjb/chinese_fishing_vessels_of_galapagos.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470977/normal_60119fad90229.pdfIn PDF document text
    • https://cdn.sqhk.co/kukisigafumi/rwichch/dictator_movie_telugu_video.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4531626/normal_60165e9e0a4a3.pdfIn PDF document text
    • https://cdn.sqhk.co/tusadopovet/UCKtihx/zombie_evil_kill_mod_apk.pdfIn PDF document text
    • http://particuliers-societegenerale.xyz/remington_chain_saw_replacement_partswck3d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445104/normal_5ff3610681c8c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lojonawaz.rf.gd/emerson_compact_fridge_and_freezer.pdfIn PDF document text
    • http://pamilov.epizy.com/como_se_elabora_un_manual_de_organizacion_de_una_empresa.pdfIn PDF document text
    • http://giwimev.rf.gd/the_revenant_movie_in_spanish.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_off0000e3eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3EB 4796 bytes
SHA-256: 494cefa8a69c78a71a7634206d6f5b3d3a1b4aee0323ba29a84b6a5013f40ac7
font_01_sfnt_off0000f445.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF445 10936 bytes
SHA-256: 5db6a129b85dfe70fc09ab1edd2b827fd8442b208394e7fdc66f42f70dba2746

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