Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c58a8608e86b766…

MALICIOUS

PDF

78.9 KB Created: 2021-06-10 13:03:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 787376a79dd83f82e98975c0e8ad43aa SHA-1: 142fd4850d98909e659e24c7b8926da8c94fd1f6 SHA-256: 8c58a8608e86b766035d1db5c4bedeafe612344dfb4929448f8641aca1e7f06b
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which are hosted on disposable domains and utilize UTM parameters, indicating a link farm designed to drive traffic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or scamming purposes. While no scripts were explicitly extracted, the presence of external links and the nature of the heuristics point towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://huntic.ru/pbw?utm_term=roblox+arsenal+aimbot+hacks PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4498678/normal_605053d5874e2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409122/normal_5ffdbe0e34d98.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386337/normal_603dee01330f5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501804/normal_5fc7c10e2ad1a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487663/normal_60352689b4090.pdfIn PDF document text
    • https://nepujegoxamo.weebly.com/uploads/1/3/4/3/134380276/jilinavor.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381289/normal_6045857f28d45.pdfIn PDF document text
    • https://lalazifesulalo.weebly.com/uploads/1/3/4/5/134502535/kodirinax-davowuluxadoz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481539/normal_6059b8d3384b1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377909/normal_60bec5e4c6bb1.pdfIn PDF document text
    • https://lasirobazu.weebly.com/uploads/1/3/4/3/134399905/funogexanile-sefatigifipidu-mozasopejopov.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368770/normal_6028eb6557bfe.pdfIn PDF document text
    • https://lubikumak.weebly.com/uploads/1/3/1/4/131453733/woribodud-kawipimub-midowisigo-jageduxopapax.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461481/normal_605a754c55e31.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bomasasawavi.pbworks.com/f/love_an_illusion_manga.pdfIn PDF document text
    • http://gamaxidad.pbworks.com/w/file/fetch/144535794/boxegukubumeniluw.pdfIn PDF document text
    • http://xosufixemuf.pbworks.com/f/introduction_to_linear_optimization.pdfIn PDF document text
    • http://mupalunava.pbworks.com/f/plotting_points_on_a_coordinate_plane_worksheet.pdfIn PDF document text
    • http://tepuvewi.pbworks.com/f/the_bodyweight_bodybuilder_2.0.pdfIn PDF document text
    • http://bopelijexuf.pbworks.com/w/file/fetch/144450078/88584010513.pdfIn PDF document text
    • http://gufabewa.pbworks.com/w/file/fetch/144457062/9363184438.pdfIn PDF document text
    • http://newubotadov.pbworks.com/w/file/fetch/144544161/what_did_rutherfords_scattering_experiment_show.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA55 5320 bytes
SHA-256: 16d91ee7f14761b0b15cf71eed825c8c7ed0779698f760f739598d1692679e5b
font_01_sfnt_off00010c48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C48 11972 bytes
SHA-256: b0604c6cdfafe68c19282e7da05d0c62c3c06013b4b17d12009fee2c38ff377e