Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0b3d38906c7202d…

MALICIOUS

PDF

68.5 KB Created: 2021-03-25 08:02:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c91c7b5fd9667702d1e83fae3a4829eb SHA-1: aef21f8fa164ad218db4ae1ba847cb6a9d9ec60b SHA-256: e0b3d38906c7202d3a6419930173ea4a19c214805bc08d645abba26cbad8f3b1
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are part of a link farm designed to artificially inflate search engine rankings. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jacksth.ru/award?keyword=manual+de+arduino+nano+pdf
    • https://cdn.sqhk.co/pijuvedozuw/iWP4dzI/91352490593.pdf
    • https://cdn.sqhk.co/mitajaso/gcAXMbF/kedujutozelefujas.pdf
    • http://afracheat1.xyz/strength_training_exercises_weights32fea.pdf
    • https://cdn.sqhk.co/nejijilo/BgjoUid/gumball_games_darwin_s_yearbook.pdf
    • https://cdn.sqhk.co/jinubodilev/aje8ahd/104793241.pdf
    • http://copyrights-notices-helps.com/94153493185s7a20.pdf
    • https://cdn.sqhk.co/bulixanejad/G8giid9/missing_persons_search.pdf
    • http://trastenmyqort.online/how_long_do_canon_ink_cartridges_lastqql5v.pdf
    • http://losmopaka.site/emotional_support_animal_doctor_letter_templateaub3p.pdf
    • http://gatorama.site/78394359175beex6.pdf
    • https://cdn.sqhk.co/lobinazema/igjswjh/79182330731.pdf
    • https://cdn.sqhk.co/wamefuvew/ovgd5jg/memufiponusawewedatuboru.pdf
    • http://copytoshka.ru/xudukerevidobobowusiweduqd3qh.pdf
    • https://dolojimopa.weebly.com/uploads/1/3/4/8/134887070/legalopawag_guxuw_letiwubunidomet.pdf
    • https://mulokigapasol.weebly.com/uploads/1/3/1/0/131070847/3229253.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/bulolimepol/aircrack_ng_windows_free.pdf
    • https://s3.amazonaws.com/xufoxorog/zaverulideb.pdf
    • https://s3.amazonaws.com/pezofut/motemusodidofiwazupufowan.pdf
    • https://s3.amazonaws.com/zemunomipazikez/77030593114.pdf
    • https://s3.amazonaws.com/lumixi/walton_argumentation_schemes.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d1bb.bin
10f6924062f216bb00f429f28d2cd40156bdffcef12d4c6f6fc4a6a08dcc4df4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD1BB 4864 bytes
font_01_sfnt_off0000e262.bin
d2d2b7c349c0778f449945727371afd78ed02e341e9d68065b7361a479d349e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE262 10080 bytes

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