Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8f5fdd83a8a2538…

MALICIOUS

PDF

70.8 KB Created: 2021-06-09 14:59:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: d84938a4d38e63537c687a1cf0981dab SHA-1: cfb5bc11cc0d8cf66df9bf9c04381590b43edee9 SHA-256: c8f5fdd83a8a2538d9ece6f8e5a2f6d5a626a8e088394f22748956235f9aff90
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs pointing to link farms and disposable hosting, suggesting a phishing or malware distribution campaign. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a deliberate attempt to create a deceptive link farm. No scripts were extracted from this sample, but the presence of multiple external URIs suggests it is 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://laborke.ru/pbw?utm_term=21+month+baby+boy+weight+in+kg PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4426972/normal_6019736f319a6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503791/normal_6066ed76a4d0e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480748/normal_604d014ad5540.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447647/normal_6058fd8a7c7e6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383137/normal_5fd84db616b05.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383577/normal_60281342341a8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463272/normal_6060219a485d6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488315/normal_606c8cebba902.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370088/normal_6057fccc3d0d5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wiliser.pbworks.com/f/64973187145.pdfIn PDF document text
    • http://guwodav.pbworks.com/w/file/fetch/144779226/how_to_turn_off_secret_conversation_on_messenger_july_2020.pdfIn PDF document text
    • http://sonubugu.pbworks.com/w/file/fetch/144894297/78482380980.pdfIn PDF document text
    • http://tikomegeto.pbworks.com/f/solving_quadratic_equations_by_graphing_worksheet_answers_algebra_2.pdfIn PDF document text
    • http://juwelite.pbworks.com/f/89372728090.pdfIn PDF document text
    • http://rukutuxeriro.pbworks.com/f/8507584153.pdfIn PDF document text
    • http://lorugaz.pbworks.com/w/file/fetch/144880617/anderson_fundamentals_of_aerodynamics.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_off0000d8f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8F4 5280 bytes
SHA-256: 7c82312af37e02f4757f711da7033925fecebcea5aae7c7e371a4d59d81f7964
font_01_sfnt_off0000eaea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAEA 10424 bytes
SHA-256: ffbc0e96d93096eecb8264e950fbc32312eaaa6a9c88e75dc6a7fd82550e470b

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