Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f189be9b6e99d56…

MALICIOUS

PDF

84.2 KB Created: 2021-03-03 17:40:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 889433dea3336d619a53edd298189cee SHA-1: 390175dc863ec54b601ba864840b3d99514ffe8b SHA-256: 1f189be9b6e99d5629f5a7e982ece8030198e13e947f3079c58b4607c9d356e7
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ML and ClamAV, indicating malicious intent. It contains numerous embedded URLs pointing to disposable domains, suggesting a phishing or malware distribution scheme. The document body, though partially corrupted, appears to be a lure related to a book summary, which is a common tactic for social engineering.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://maypoin.ru/strik?utm_term=resumen+del+libro+rayuela+de+julio+cortazar PDF link annotation
    • http://medgaj.com/86055350265tlvut.pdfIn PDF document text
    • http://oneitshop.info/asignaturas_psicologia_unedh1y9f.pdfIn PDF document text
    • http://republvinb.fun/410717141762au74.pdfIn PDF document text
    • https://cdn.sqhk.co/xifobariw/jdgcAgc/kekajiwemilijabolod.pdfIn PDF document text
    • http://raftgjgr.space/attu_movie_song_in_starmusiqrb7tr.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385434/normal_6020a4ded726d.pdfIn PDF document text
    • http://italiahot.fun/refededglno.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414849/normal_5ff8afa79af1e.pdfIn PDF document text
    • http://the-job.ru/m-audio_keyrig_49_reviewg997g.pdfIn PDF document text
    • http://tells.fun/12657180481adwti.pdfIn PDF document text
    • http://ketrovk.xyz/fifosumadpkb7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jigiwema.epizy.com/4636571233.pdfIn PDF document text
    • https://s3.amazonaws.com/dufekifaral/siwobabogajugebulezowawup.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f36a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF36A 5460 bytes
SHA-256: 97b2500cc9951a60b7aff4f0623e12476330f4b11994fd92208ea99b224e28b3
font_01_sfnt_off000105f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105F5 11784 bytes
SHA-256: effa1795e34a284302af68ec805682e17852c4fa51e4332726453600acd87055
font_02_sfnt_off00012c5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C5D 16376 bytes
SHA-256: f267a97a42ed964490c0c36cf8d24d30f5cfc386ee24850e75bb3a4991f11828

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