Malicious PDF — malware analysis report

Static analysis result for SHA-256 436a75284e9cf12b…

MALICIOUS

PDF

74.2 KB Created: 2021-02-24 06:10:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: d857e6fa813ee46826d0be3447ef0bcb SHA-1: 29f73da45de9c63bcf846e760b179e814bc5d870 SHA-256: 436a75284e9cf12b34997ebb40667b7c43465636303fb1641d10cfb033526df7
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with several pointing to disposable hosting and potentially malicious domains, suggesting a link farm or phishing lure. The presence of external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly support an attack pattern focused on redirecting users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/strik?utm_term=is+salicylic+acid+good+for+scalp+acne+scars PDF link annotation
    • http://uscreditinquiry.info/croatia_travel_guide_bestu4y9m.pdfIn PDF document text
    • https://cdn.sqhk.co/ruwonumatag/e3hdBb7/radioactive_decay_calculator.pdfIn PDF document text
    • https://cdn.sqhk.co/vozaxodep/idjfSmp/nintendo_switch_online_12-_month_individual_membership_sale.pdfIn PDF document text
    • https://cdn.sqhk.co/tipusuzog/HjagdVh/85589836181.pdfIn PDF document text
    • https://cdn.sqhk.co/mofosalamo/USnIwRD/sorawebejavadimokixajuz.pdfIn PDF document text
    • http://rezonansmusic.com/2010_lexus_rx_350_trunk_dimensionsu282s.pdfIn PDF document text
    • https://cdn.sqhk.co/letowajaf/msicjjb/mega_ramp_stunts_master_speed_boat_racing_games.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366036/normal_5fd99273d446b.pdfIn PDF document text
    • https://cdn.sqhk.co/jamolipa/iawFkjj/442722648.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4529087/normal_601ef65b7c228.pdfIn PDF document text
    • http://idealicaitalia.website/hero_of_the_rails_ds_gamem9idy.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380393/normal_60113d196bf68.pdfIn PDF document text
    • https://cdn.sqhk.co/wafavalufa/rAge0Cb/56810258810.pdfIn PDF document text
    • http://car-den.ru/sodarigamebapovefarudemile197h.pdfIn PDF document text
    • https://cdn.sqhk.co/woselukafo/jhqhfhd/total_annihilation_star_wars_mod.pdfIn PDF document text
    • https://cdn.sqhk.co/xuwolupenilu/cie9vS7/rojuxaputudiwika.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368219/normal_5ff5d014e7a02.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/xonaxevetaf/gasmandi_new_report.pdfIn PDF document text
    • https://s3.amazonaws.com/xufoxorog/93531442125.pdfIn PDF document text
    • https://s3.amazonaws.com/luropi/tiduzigo.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_off0000e4b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B1 5364 bytes
SHA-256: fc665c7ecabad3a8d743a048c9a30c8a8167345c3cd498eb00e73dcebe0aadb7
font_01_sfnt_off0000f70a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF70A 10724 bytes
SHA-256: af60acaacf67f41342536c88bca4620b6ea5b7204e6fc8bf84cc1624a7b6b806

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