Malicious PDF — malware analysis report

Static analysis result for SHA-256 afab3cbb6b931329…

MALICIOUS

PDF

77.6 KB Created: 2021-03-03 22:40:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 8c51ebde7b086eb8d8f659ca938e79bc SHA-1: fe2d566119a4eda020939384251e82e7fe5be41a SHA-256: afab3cbb6b931329d0df37a15bc3a74a3fd31dc04e1d14597d8d620776dfe987
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or redirection scheme to host malicious content. The document body, though heavily obfuscated, contains metadata related to its creation, but the primary malicious intent appears to be directing users to external, untrusted websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://ponafet.ru/award?keyword=what+are+the+three+approaches+to+curriculum PDF link annotation
    • https://cdn.sqhk.co/nisikevepoxi/jjTH8J9/domuf.pdfIn PDF document text
    • http://swiss-family.space/olympus_om-d_e-m1_mark_iii_manualt2ybd.pdfIn PDF document text
    • http://filanion.online/4th_grade_math_test_questionsu0hde.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450628/normal_5fcb2c0ea968d.pdfIn PDF document text
    • http://snt-br.ru/30397082362f0sip.pdfIn PDF document text
    • https://cdn.sqhk.co/mumaxifup/Uhagf3d/brick_breaker_champion_cheats.pdfIn PDF document text
    • http://jushq.pro/ramijimofemipqdume.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412413/normal_602ee43dc2270.pdfIn PDF document text
    • https://cdn.sqhk.co/viwiratoposu/jg3igfA/99675025952.pdfIn PDF document text
    • http://meetcabinets.xyz/standard_tire_size_for_2007_chevy_impalaf2qr5.pdfIn PDF document text
    • https://cdn.sqhk.co/bagadogod/Y0ghQia/19400299798.pdfIn PDF document text
    • http://fukoxonezadanom.22web.org/japori.pdfIn PDF document text
    • http://optarfes.com/jupebutokokubiwusou6m5l.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/fonibinaraj/background_hd_black_images.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_off0000f2b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B5 5188 bytes
SHA-256: c7c7047cdc4eb8f9a328b1470def4ce0563fcb4ad89ef27be77a178b25def982
font_01_sfnt_off0001043a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1043A 10888 bytes
SHA-256: f35b9f538a885980ed472c62901ca9b8053b101775bae3ed4bf53175be906b72

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