Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c67a00c782e866c…

MALICIOUS

PDF

74.7 KB Created: 2021-04-13 00:57:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 1118d1ebc240af300d740f72aab8796d SHA-1: 9397fe76a9926b26a25239d9181e911b972d0b11 SHA-256: 0c67a00c782e866c3594ee01848236b0a03adf39caee7c0af4be3c3f8cfc7762
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or redirection scheme. The document body, though heavily obfuscated, contains metadata related to wkhtmltopdf and a date, but no clear user-facing content. The primary attack vector appears to be directing users to potentially malicious external sites.

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/strik?utm_term=can+we+recite+surah+mulk+for+deceased PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4477401/normal_606c9f2cbf35d.pdfIn PDF document text
    • https://kokubexajaluk.weebly.com/uploads/1/3/2/6/132681668/xelevalonosoridirata.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375891/normal_606acaf1cfab9.pdfIn PDF document text
    • http://theraisins.pro/printer_cartridge_hp_officejet_pro_8620tspkn.pdfIn PDF document text
    • http://limaxinsto.xyz/loxusianueo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483081/normal_5fd1902ac9770.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474192/normal_601c7589dd397.pdfIn PDF document text
    • http://richteam.site/73905441088v9kra.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420760/normal_5fdf3b7a1fe00.pdfIn PDF document text
    • https://cdn.sqhk.co/kisesawaropo/I6eccjc/jumpy_jumpy_helix_ball_game.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477156/normal_60613702ac89d.pdfIn PDF document text
    • https://duvutotan.weebly.com/uploads/1/3/0/7/130775700/6819338.pdfIn PDF document text
    • http://bestgirl69.com/space_race_game_download5yw6p.pdfIn PDF document text
    • https://cdn.sqhk.co/nulaliki/iiiGRhg/wars_and_battles_apk.pdfIn PDF document text
    • https://soguleta.weebly.com/uploads/1/3/4/3/134305846/51cec4b317ead4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379236/normal_604d72af72fe4.pdfIn PDF document text
    • http://goldenframecollision.com/33010785519vkr16.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424997/normal_5fcc616c8a0aa.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/nelizenejakarug/netflix_app_ipad.pdfIn PDF document text
    • https://s3.amazonaws.com/kukazowox/zenugotazebipam.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_off0000e746.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE746 5324 bytes
SHA-256: 9af531d000aa9965952bcb78b22ca052d2f5e49123f3b77ec75a5868bc2d9e18
font_01_sfnt_off0000f941.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF941 10696 bytes
SHA-256: b3edd47638310c41d15c6e4fdc1c502780bf3e3a66a8e135927e23408e6ee847

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