Malicious PDF — malware analysis report

Static analysis result for SHA-256 82ea6ac2447580ac…

MALICIOUS

PDF

107.8 KB Created: 2021-02-15 08:16:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: d62c5a8c85e3e02754aee15e1cf263c4 SHA-1: fcef036185ee4840d52f8b2db13721dd713c512f SHA-256: 82ea6ac2447580acde61da8406b167991da618c36aa6a6dc6fb260f04e20aa0a
186 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, with many pointing to disposable domains, indicating a link farm or SEO manipulation tactic. One critical heuristic specifically flags it as a 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM'. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the link farm suggest a potential for redirecting users to malicious sites or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://leonvi.ru/wix?keyword=megaman+x4+best+boss+order PDF link annotation
    • http://helplnstagramcontact6088756.com/rawomujuwefobojoldfrqz.pdfIn PDF document text
    • https://pigiwikabulate.weebly.com/uploads/1/3/1/8/131856715/1da7b8bbbc87.pdfIn PDF document text
    • https://rawoxozuk.weebly.com/uploads/1/3/2/6/132695352/6013703.pdfIn PDF document text
    • https://fumevido.weebly.com/uploads/1/3/0/8/130874276/78bdc0.pdfIn PDF document text
    • https://gojudewusidaza.weebly.com/uploads/1/3/4/8/134888042/bubefujaxiga.pdfIn PDF document text
    • https://cdn.sqhk.co/pukefoxer/iihhia9/bikapolupuvalananogow.pdfIn PDF document text
    • http://xexufonek.iblogger.org/33910047459.pdfIn PDF document text
    • http://helper-badges.com/etapa_precientifica_del_trabajo_social_boris_limai0a6a.pdfIn PDF document text
    • https://cdn.sqhk.co/mudonisogub/jbhfhg5/yahoo_games_text_twist_1.pdfIn PDF document text
    • https://mogeletonedilo.weebly.com/uploads/1/3/1/4/131482944/buzosak.pdfIn PDF document text
    • http://gufutaca5.xyz/beep_sound_mp4ols1s.pdfIn PDF document text
    • https://surevasod.weebly.com/uploads/1/3/1/8/131856145/laxojomadotoxo-pasoligepojomox-kotokolisodumow.pdfIn PDF document text
    • http://dwatches.site/nowokoradanezhay7.pdfIn PDF document text
    • http://vienvozvrat.site/3359719999v9how.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://favekagopu.epizy.com/bipolar_type_2_treatment_guidelines.pdfIn PDF document text
    • http://tororixiranop.rf.gd/technical_writing_notes.pdfIn PDF document text
    • http://rebokomixuxoj.epizy.com/charminar_kannada_film_audio_songs.pdfIn PDF document text
    • http://jaxojuruwak.rf.gd/aflac_cancer_wellness_benefit_claim_form_2017.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012c60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C60 17200 bytes
SHA-256: 1465123392ee1b1b70766f2cdc535f7866dc6869bb9117fcc716dda3bc24f093
font_01_sfnt_off000163f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x163F3 5412 bytes
SHA-256: 34f4d19ee26316dca9feebd61f999e20e8e01d0fa9f0b0882a0ade1c72574777
font_02_sfnt_off0001765a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1765A 13436 bytes
SHA-256: ba4b9f6da0de498573aea451edc5bdec0331bac11f6374b20545156bbffff319

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