Malicious PDF — malware analysis report

Static analysis result for SHA-256 333ce23d384a5655…

MALICIOUS

PDF

72.2 KB Created: 2021-03-28 08:04:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: a779ad23b5cc7d1b4b3fc8f4e3cbd83c SHA-1: d0036d4bfc701f59f957bb74dc1f5bf1d98f9b5b SHA-256: 333ce23d384a56556cf5698b0f5b90216b4a5842f2bf074f600b4fe3afc7109b
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or redirection mechanism. The document body, though heavily obfuscated, indicates a lure related to an 'adjective clauses worksheet', which is likely a pretext to drive users to malicious sites.

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://bologen.ru/wix?keyword=adjective+clauses+worksheet PDF link annotation
    • http://rubeatyshop.xyz/79826598347wzuba.pdfIn PDF document text
    • http://zozegakipuvi.iblogger.org/jasiriz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386337/normal_601fb5c20dbf7.pdfIn PDF document text
    • http://feziweninepiv.iblogger.org/firopudub.pdfIn PDF document text
    • https://tupodoki.weebly.com/uploads/1/3/0/7/130776149/550f81b10006f3.pdfIn PDF document text
    • http://fitness-ital.fun/certificate_enrollment_error_no_template_informationk3qdr.pdfIn PDF document text
    • https://fajorisovobune.weebly.com/uploads/1/3/4/7/134752278/kowekezeromit.pdfIn PDF document text
    • https://cdn.sqhk.co/tavaxikanabu/j1Epjf9/pimerinavewakax.pdfIn PDF document text
    • http://oneshops.space/broadside_array_antennarkbjh.pdfIn PDF document text
    • http://rubezemanugewev.22web.org/the_white_queen_episode_7_recap.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460963/normal_604176d45b6e2.pdfIn PDF document text
    • https://cdn.sqhk.co/fifenije/gf6gdge/hallmark_drama_channel_tv_schedule.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416305/normal_6047d44014f7e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405208/normal_5fcd367aa2a44.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389394/normal_60172c2e981f2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lugirike.epizy.com/27798937525.pdfIn PDF document text
    • https://s3.amazonaws.com/jonora/xiwiperogiginizowi.pdfIn PDF document text
    • https://s3.amazonaws.com/neviwove/autocad_2007_free_filehippo_64_bit.pdfIn PDF document text
    • https://s3.amazonaws.com/mefovu/3076144223.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_off0000db6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB6C 5308 bytes
SHA-256: 867df2e8242f29cfae3c7235f343dae11412ab6410e9d892c4564b372e123fb9
font_01_sfnt_off0000ed8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED8C 11216 bytes
SHA-256: 5f80c2e0262966503dc91f351b0a259c754be95842c44292e35da5b0cf6e6631

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