Malicious PDF — malware analysis report

Static analysis result for SHA-256 f124f55914f6b5b3…

MALICIOUS

PDF

80.9 KB Created: 2021-02-22 09:35:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 666bc461288d31901d922189de855508 SHA-1: 208dcaf8045ac496915fcaba9037971dee871276 SHA-256: f124f55914f6b5b3af9aad5c0b939cab662ef6bfc08f72d8c2d091e8ec4f38df
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are disguised as legitimate content or search results, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards a malicious document designed to redirect users to potentially harmful 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 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.
  • 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/strik?utm_term=jim+carrey+christmas+carol+full+movie+youtube PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4495264/normal_602a210e56c18.pdfIn PDF document text
    • https://finiluxib.weebly.com/uploads/1/3/5/3/135350298/soxetifexukege_ratiredoxasi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452607/normal_5fd33414c32bd.pdfIn PDF document text
    • https://cdn.sqhk.co/fasotaluvose/eihpqha/lamorogozuforodonudolofa.pdfIn PDF document text
    • https://cdn.sqhk.co/torixugajo/cQILjbX/within_participants_design_definition.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471234/normal_60120a4e5e32c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367279/normal_5fe973c313dd7.pdfIn PDF document text
    • https://cdn.sqhk.co/potiribuwuf/fCorihV/soccer_championship_game_2019.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420608/normal_600b369f73197.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419836/normal_60265f10709ad.pdfIn PDF document text
    • https://cdn.sqhk.co/gutemokerezo/injf3UM/kaiser_anaheim_covid_testing_hours.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/bupijila/catholic_holy_bible_in_english.pdfIn PDF document text
    • https://s3.amazonaws.com/vajefam/interval_estimation_questions_and_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/jebupofedijakuk/amestrian_military_uniform.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_off0000f2da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2DA 3320 bytes
SHA-256: 3e4ac762062c8d56bb5e848013f2965939ea217716e4298233c9bd505dade9a5
font_01_sfnt_off0000fec5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEC5 5412 bytes
SHA-256: a100ad711c29e5729ba92b426145a1e78299b8bfaa99f8b2f8cfcad50925030a
font_02_sfnt_off0001110f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1110F 11056 bytes
SHA-256: e1d255e0edb19eda478cacf703559880870c58289ebe2958b7ca72722ac5dd97

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