Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dff71aad39b4277…

MALICIOUS

PDF

84.0 KB Created: 2021-04-11 18:24:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: d5286c3225225ac3c010b4cf0c2b703c SHA-1: acef63e204b78111c2c6681c0cb28b5589339d04 SHA-256: 8dff71aad39b4277ca512e9719e6b3a663bbdee8f2799993c5d72cb5235eee93
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and is identified as a link farm, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the presence of embedded URLs and the heuristic findings point towards the document's primary function being to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jacksth.ru/strik?utm_term=twilight+saga+cast PDF link annotation
    • https://jubibesu.weebly.com/uploads/1/3/1/3/131379113/6258661.pdfIn PDF document text
    • http://pedron.fun/zimivobonabiduruseladerse1.pdfIn PDF document text
    • https://cdn.sqhk.co/tisewesir/ecbMXKx/60125283340.pdfIn PDF document text
    • http://safetymirrors.xyz/farugafopasjazgh.pdfIn PDF document text
    • https://dabomisefeb.weebly.com/uploads/1/3/0/7/130775205/mizexegisidir.pdfIn PDF document text
    • https://kewenarizifosiz.weebly.com/uploads/1/3/6/0/136092989/tekefaxazigumer-duliviturinuje-zeniv.pdfIn PDF document text
    • https://cdn.sqhk.co/sunawopi/gjgjigI/totally_tactic_accurate_battle_simulator_apk_latest_version.pdfIn PDF document text
    • https://cdn.sqhk.co/lofakekaf/eehhjeV/xagopoxaroku.pdfIn PDF document text
    • http://alteramaks.world/911156335420zvib.pdfIn PDF document text
    • https://cdn.sqhk.co/walumupo/jyONib3/simple_modern_house_design_plans.pdfIn PDF document text
    • https://cdn.sqhk.co/mutuwatu/jaieDia/kekumus.pdfIn PDF document text
    • http://aires.fun/tnm_staging_colon_cancer_7th_edition1961k.pdfIn PDF document text
    • https://neverudinirol.weebly.com/uploads/1/3/4/5/134585264/fudigo-paritipeluxarup.pdfIn PDF document text
    • https://cdn.sqhk.co/serodozire/pYiaaCz/mirtazapine_side_effects_in_cats.pdfIn PDF document text
    • http://kalavar.xyz/diary_of_a_wimpy_kid_long_haulf2z2a.pdfIn PDF document text
    • http://zelopaqq.xyz/certified_ophthalmic_assistant_exam_study_guidedm1nh.pdfIn PDF document text
    • http://about-central.com/75313527200lulb7.pdfIn PDF document text
    • https://cdn.sqhk.co/bokirebi/l1an1bd/blade_babji_telugu_movie.pdfIn PDF document text
    • https://rugexosijebup.weebly.com/uploads/1/3/4/0/134017508/375c913c46d0.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/fopalew/botox_injection_into_piriformis_muscle.pdfIn PDF document text
    • https://s3.amazonaws.com/xaliwalufoguni/16676326537.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_off00010939.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10939 5004 bytes
SHA-256: da0f5d1848bbe65321ebbb6fefb5495224067410eb62c877ed716b909d8c4d2d
font_01_sfnt_off00011a55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A55 11696 bytes
SHA-256: 3ecdee90e1c10f234f3ae68abff45dbc39d15d4e556eb1cefce35a5e245dd86d

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