Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1d104f3c8998ff3…

MALICIOUS

PDF

88.2 KB Created: 2021-04-26 16:57:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 08aa135234719b35f0e743bfa9769fe8 SHA-1: 55b8def7830e1c801d51409e776ce18dba4508a4 SHA-256: d1d104f3c8998ff3025b597f42b66070dfb90efa71baef9f6b3e62a92ccb607d
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, indicating a phishing or spam distribution scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to deliver a phishing payload or malware. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and 'Ponniyin selvan comics tamil pdf download', suggesting a lure for users searching for specific content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://zajinet.ru/strik?utm_term=ponniyin+selvan+comics+tamil+pdf+download PDF link annotation
    • http://forecast.bet/54805616472732je.pdfIn PDF document text
    • https://cdn.sqhk.co/gatidixon/iaSgcvI/jerad.pdfIn PDF document text
    • https://lepabamun.weebly.com/uploads/1/3/1/6/131636917/931339.pdfIn PDF document text
    • https://cdn.sqhk.co/tisojubew/giegfib/pimob.pdfIn PDF document text
    • http://clientbluebadge.com/w_m2_to_w_ft2497rm.pdfIn PDF document text
    • http://redirerer.medianewsonline.com/dofojesolaton.pdfIn PDF document text
    • https://zobojosapez.weebly.com/uploads/1/3/1/4/131483592/mevanexu-moguluwoxodel.pdfIn PDF document text
    • http://tehnotop.space/wukajivatogonuvaxodotiwexxrqh.pdfIn PDF document text
    • http://fb-ig-violation.com/craftsman_lt1000_owners_manual19byt.pdfIn PDF document text
    • http://islta.fun/207424172328tibt.pdfIn PDF document text
    • https://kemiponoza.weebly.com/uploads/1/3/4/6/134605011/nowexesat.pdfIn PDF document text
    • http://bellissimo.online/how_to_speed_up_kawasaki_mule_610ybiyc.pdfIn PDF document text
    • https://cdn.sqhk.co/viwitukaz/brjhDtB/50760332443.pdfIn PDF document text
    • http://larumutul.getenjoyment.net/sesoxemejopof.pdfIn PDF document text
    • http://mivifukatovaga.getenjoyment.net/fokavuxezeximed.pdfIn PDF document text
    • https://cdn.sqhk.co/xolofiwano/ghZicns/air_combat_racing.pdfIn PDF document text
    • https://viwutexotopuj.weebly.com/uploads/1/3/4/5/134522905/sivilevinakuron.pdfIn PDF document text
    • http://tevutubiwij.getenjoyment.net/cards_against_humanity_cards.pdfIn PDF document text
    • http://spainwow.pro/65045847454a29dy.pdfIn PDF document text
    • http://shoplus.info/kenworth_t800_service_manualgy2pc.pdfIn PDF document text
    • https://vavaterojitenoj.weebly.com/uploads/1/3/4/8/134898986/3457502.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/198ccd3a-03b9-44bc-a919-96ed535138dd/letra_musica_stressed_out.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2704747d-ec18-49fb-bb17-b2b9c04fa680/negufeworesagagaxijebizi.pdfIn PDF document text
    • http://lapetagalelan.myartsonline.com/e_waste_management_project_in_marathi.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_off00011b46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B46 5460 bytes
SHA-256: fdecdaceef6822b96cffd6d2812a1475cbc2935707da6e58a784528e03747f4a
font_01_sfnt_off00012def.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DEF 10956 bytes
SHA-256: edfa81e478da585f4dd69f3a014c182133335de22e639306130e02c2ee790735

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