Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5f9b035fab56068…

MALICIOUS

PDF

92.4 KB Created: 2021-01-25 18:10:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: b43426e32989a64f87090f982aef5d1d SHA-1: 1dbbaf481946daeaee01cdcbb7f3bf5fbaf03632 SHA-256: f5f9b035fab560680cec778b25dcc5a6aa964cc4e8e93fa46f761de033751d75
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains and link farms, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious content.

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://trafficel.ru/123?utm_term=the+shelby+star+mugshots PDF link annotation
    • http://belkwigs.com/mugejalmxp8.pdfIn PDF document text
    • https://sefuxogam.weebly.com/uploads/1/3/4/4/134466031/zokogubasuvis.pdfIn PDF document text
    • https://gojatoxemoniro.weebly.com/uploads/1/3/4/8/134894745/8d9f9cddef6b.pdfIn PDF document text
    • https://jijobowuzum.weebly.com/uploads/1/3/4/5/134590228/2910262.pdfIn PDF document text
    • https://cdn.sqhk.co/nokotadi/dia90tl/download_royal_robots_battleground_mod_apk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414486/normal_600075253b82b.pdfIn PDF document text
    • https://fejamelaluboj.weebly.com/uploads/1/3/4/3/134311679/4579787.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457560/normal_5ff8da81a486b.pdfIn PDF document text
    • http://milanomoda-italy.website/plants_vs_zombies_heroes_daily_challenge_todayyq2bt.pdfIn PDF document text
    • http://uaportal.site/65068722995j8f32.pdfIn PDF document text
    • https://cdn.sqhk.co/kikolibub/jRKggE1/ditosirafabemujutabi.pdfIn PDF document text
    • http://natorg.fun/digidesign_mbox_2_mini_how_to_turn_onyso7d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375708/normal_5fe2728864e89.pdfIn PDF document text
    • http://azorocheat5.xyz/mansions_of_madness_second_edition_investigator_cardsc2ewv.pdfIn PDF document text
    • https://lenexemumuvag.weebly.com/uploads/1/3/1/4/131438583/6503a.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/dudujopixejikug/63502750422.pdfIn PDF document text
    • https://s3.amazonaws.com/fosalizuzu/41596565863.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_off00012e10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E10 5288 bytes
SHA-256: 9dbe9ad06ff7f5a55965c45e32aa625002d81d24de7b9e6c0c6e9cb485051ec5
font_01_sfnt_off00013feb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FEB 10656 bytes
SHA-256: cea486f89cd34b52afb8f45e165cf967ab40a3ef8e9f904f213c7a841399d507

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