Malicious PDF — malware analysis report

Static analysis result for SHA-256 90d98fb81ba53df0…

MALICIOUS

PDF

99.0 KB Created: 2021-06-05 04:50:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 39665c8f146e69a3fcc9a019e457329c SHA-1: 3efa16daad8cd441a4cb0a975715c90b2f0b12cc SHA-256: 90d98fb81ba53df0294c9d7c61f022687890c7e692e56ab7ff4bacb555344659
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF contains numerous embedded links, many pointing to disposable hosting services, suggesting a link farm designed to redirect users to potentially malicious sites. The presence of embedded JavaScript, though not fully analyzed, further supports the likelihood of malicious activity, such as phishing or malware delivery.

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://huntic.ru/pbw?utm_term=rock+band+4+guitar+compatibility+ps3 PDF link annotation
    • https://getedizexagan.weebly.com/uploads/1/3/0/7/130740146/9567466.pdfIn PDF document text
    • https://numokupe.weebly.com/uploads/1/3/4/8/134857704/wunode-jefesiwog-penowome.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385038/normal_6051fb07c867f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460680/normal_5ffd031a22207.pdfIn PDF document text
    • https://pogerukafitili.weebly.com/uploads/1/3/1/4/131437037/4943107.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fuxedemama.pbworks.com/w/file/fetch/144522513/kejomeduw.pdfIn PDF document text
    • http://xetibubib.pbworks.com/w/file/fetch/144418668/what_is_the_composition_of_olive_oil.pdfIn PDF document text
    • http://jebusolole.pbworks.com/w/file/fetch/144643161/how_to_size_generator_for_home.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5404d996-f864-4fce-b6a8-c25ae65f11c1/14988211944.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78e8d3c4-c485-4b94-9bee-2b8e53ec2324/58809999729.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4b26d12-8a34-422f-88e3-34d909f5b5ba/smart_watch_xiaomi_mi_band_3_reloj_sport_negro.pdfIn PDF document text
    • http://mumubib.pbworks.com/f/40860724403.pdfIn PDF document text
    • http://gazumadu.pbworks.com/f/dulugabavobilesamum.pdfIn PDF document text
    • http://zabodovojif.pbworks.com/f/master_reset_iphone_6s_without_passcode.pdfIn PDF document text
    • http://gifavipa.pbworks.com/w/file/fetch/144610176/gukelivuvu.pdfIn PDF document text
    • http://kekirow.pbworks.com/w/file/fetch/144634797/nabur.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b6c1b33-77fc-4177-9604-cfdf68ce74e8/donufewufuvugovepujimuwo.pdfIn PDF document text
    • http://gafuxexosaru.pbworks.com/w/file/fetch/144544428/345_tyt_matematik_ikinci_dereceden_denklemler_test_2.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_off00013cd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CD4 5960 bytes
SHA-256: 2360237725b231a1edbed92bf843271763b0eb029bc73d935cd97f308d535d16
font_01_sfnt_off00015123.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15123 13652 bytes
SHA-256: 89be255b1851c0221fc720ce08a62258e025c9c701c7137636187c73b71ea339

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