Malicious PDF — malware analysis report

Static analysis result for SHA-256 da1f24998fff2078…

MALICIOUS

PDF

72.9 KB Created: 2021-02-21 18:47:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 1a305626deb82c2cd3b05b476b8448d6 SHA-1: 73d34b673daf36bb71bb423a0a43b895c8292582 SHA-256: da1f24998fff2078cae4aca573f62e59c007abc1db4edc59d711ba5f9918a21f
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with many pointing to disposable hosting services, indicative of a link farm designed to obscure malicious destinations. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites.

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://maypoin.ru/123?utm_term=the+tibetan+book+of+the+dead+quotes PDF link annotation
    • https://mejibafizafev.weebly.com/uploads/1/3/4/0/134042836/muxegorakujow.pdfIn PDF document text
    • https://cdn.sqhk.co/xojelumegasi/fggMxic/big_baby_tape_net_worth.pdfIn PDF document text
    • https://wabibazo.weebly.com/uploads/1/3/5/2/135295983/0fc2d.pdfIn PDF document text
    • http://biomanix.best/tabla_conversion_mm_a_pulgadas_fraccionarias3dm80.pdfIn PDF document text
    • https://dafufiwe.weebly.com/uploads/1/3/4/3/134368649/f66ac9fab01.pdfIn PDF document text
    • https://tuwavufubuxa.weebly.com/uploads/1/3/3/9/133997694/kuvibafarolile.pdfIn PDF document text
    • http://justiciaforjustice.com/supply_chain_management_salary_in_indiaoy7y4.pdfIn PDF document text
    • http://trokot-shtorki.online/brene_brown_netflix_special_lengthien4a.pdfIn PDF document text
    • http://legalvictory.group/satisfying_slime_videos_before_bedx6sje.pdfIn PDF document text
    • http://cosmosqrab.online/bapisopewk9ku2.pdfIn PDF document text
    • https://fokifukamanur.weebly.com/uploads/1/3/0/8/130874497/5013794.pdfIn PDF document text
    • http://misstourist.info/7303344551nxb2h.pdfIn PDF document text
    • http://nobirejajatit.iblogger.org/21478226767.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lonivone.rf.gd/71257672937.pdfIn PDF document text
    • http://fakatidewejuna.epizy.com/chemical_equations_balancing_equations_challenge_answers.pdfIn PDF document text
    • http://fezajeb.epizy.com/sesasudosirakotajisemelip.pdfIn PDF document text
    • http://mowumaja.epizy.com/lalabuxezabud.pdfIn PDF document text
    • http://merekum.rf.gd/embodiment_of_evil_frieza_1st_form.pdfIn PDF document text
    • http://mosararivifu.rf.gd/dilisejepojamot.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_off0000de9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE9A 5148 bytes
SHA-256: 735a3445047dd974cd6d24e5da0cb6ab5e9f082c33a8206b40f4801ac000a9f5
font_01_sfnt_off0000f018.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF018 11320 bytes
SHA-256: 7ca83096ebbc5b0185f70c2d32b13bfaa439224232191df5525b73a77aa63292

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