Malicious PDF — malware analysis report

Static analysis result for SHA-256 838d355effdc7797…

MALICIOUS

PDF

72.7 KB Created: 2021-03-13 14:29:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 7dc6592b4f48276af9c623b9e924f651 SHA-1: 1714160814131c7c2b956be0b38058815746fd02 SHA-256: 838d355effdc77978eb3c1138f9247e1c46b99c9064b35bc01835ed181abf379
186 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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://vilenefex.ru/award?keyword=tanatologia+forense+pdf PDF link annotation
    • https://cdn.sqhk.co/vilonunufuk/ibl8L5E/tiles_hop_forever_dancing_ball_android_1.pdfIn PDF document text
    • https://cdn.sqhk.co/jotepomi/hVJUijT/99108270072.pdfIn PDF document text
    • https://cdn.sqhk.co/xufaribo/ghifslg/46703864488.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380209/normal_604a3cb0d349c.pdfIn PDF document text
    • https://cdn.sqhk.co/sabumijobude/hjeYJii/kawaii_sweet_world_2020.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465387/normal_600b2abcb9812.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409110/normal_604a5830214fc.pdfIn PDF document text
    • https://cdn.sqhk.co/tanusulirava/VgfsjfY/winky_lux_peeper_perfect_concealer.pdfIn PDF document text
    • https://cdn.sqhk.co/mujekesire/oKJidhd/zekiwanowovo.pdfIn PDF document text
    • https://fosobezi.weebly.com/uploads/1/3/4/8/134898374/ac5cd49b7a76.pdfIn PDF document text
    • https://cdn.sqhk.co/goseluna/l7jdhfb/wawifevegabusesuf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404750/normal_603158a74152f.pdfIn PDF document text
    • https://cdn.sqhk.co/sawomunuj/idhjMja/11843974336.pdfIn PDF document text
    • https://rekizutor.weebly.com/uploads/1/3/0/9/130969391/kozeluxe-lefilewamu.pdfIn PDF document text
    • https://juzopuxenepin.weebly.com/uploads/1/3/5/3/135383483/8b701689cfe3.pdfIn PDF document text
    • http://wuvudazesog.22web.org/psat_2010_score_conversion_table.pdfIn PDF document text
    • https://cdn.sqhk.co/nejisakatok/dibphdi/gukanise.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pavogojewef.rf.gd/jimoxowunurifetapok.pdfIn PDF document text
    • http://jaxudemavi.epizy.com/49424742607.pdfIn PDF document text
    • http://nadoxomamepaf.epizy.com/be_going_to_exercises_5_primarian.pdfIn PDF document text
    • http://duzavito.epizy.com/high_wizard_farming_guide_ragnarok_mobile.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_off0000db25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB25 5160 bytes
SHA-256: e9785420dc3a3ab12e62ba6049638c2348a7db0e96af1dbc94447cd20e4d6ac6
font_01_sfnt_off0000ecc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC5 12848 bytes
SHA-256: f29bf377861ba491e3433ee4a5387a08fedcf12378c834c09d3ebf0ecccfc890

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