Malicious PDF — malware analysis report

Static analysis result for SHA-256 6683dcfdc70b6664…

MALICIOUS

PDF

74.8 KB Created: 2021-02-19 02:45:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: a0e4be3fa2e37e4d0838a69aa70caaf2 SHA-1: 06bf405179f1a5c4761bde27a901ce6708f53852 SHA-256: 6683dcfdc70b6664c52fac47c67835437041cd58011bb97d78763a8a69252543
186 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded links, such as the one pointing to 'bologen.ru', are likely used to redirect users to malicious websites for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bologen.ru/aws?utm_term=how+to+login+to+microsoft+project+online PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4450160/normal_6018606be3124.pdfIn PDF document text
    • https://nipoxumafoji.weebly.com/uploads/1/3/4/7/134717148/3562483.pdfIn PDF document text
    • http://ceiling48.ru/sword_of_shadows_book_5iq8k0.pdfIn PDF document text
    • https://pazisurezufil.weebly.com/uploads/1/3/4/5/134594691/nulerimumarimi.pdfIn PDF document text
    • http://arboozfilm.com/dodge_journey_2020_manualt8pzx.pdfIn PDF document text
    • https://fufopijubotuxo.weebly.com/uploads/1/3/1/3/131381544/gasigatuxifexorarus.pdfIn PDF document text
    • http://lynciguest.com/dinosaurs_vs_aliens_comic_onlineve4uk.pdfIn PDF document text
    • https://rizomoxus.weebly.com/uploads/1/3/4/5/134589692/35f24.pdfIn PDF document text
    • http://gejekewawe.iblogger.org/tutoxisuzawujaz.pdfIn PDF document text
    • http://fastpeysistem.online/sitewn4kjf.pdfIn PDF document text
    • http://dkblogin-de.best/duzovatogopoliposodisonnmwsj.pdfIn PDF document text
    • https://kisisegexorev.weebly.com/uploads/1/3/2/3/132302984/77ce54addef69.pdfIn PDF document text
    • http://help-bluebadgecustomer.com/bonogugogn7k3.pdfIn PDF document text
    • https://bilujadaju.weebly.com/uploads/1/3/4/7/134772480/8478955.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dijijesuwaxon.epizy.com/hp_laserjet_pro_mfp_m227fdw_spec_sheet.pdfIn PDF document text
    • http://nuxumejaxumem.epizy.com/gugolagiwebojalud.pdfIn PDF document text
    • http://vevubajiziju.epizy.com/76700312172.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_off0000e668.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE668 5256 bytes
SHA-256: 31eda56c9c0562475fd70fbd51cd6a2951dc16aeaa6487dfebc5ddff7fd6bb12
font_01_sfnt_off0000f854.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF854 10468 bytes
SHA-256: f870e5f9951141a6d0452a31a03652f29a5e6401c6fb861ac2de7c536c828f55

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