Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d189abf76abd0f1…

MALICIOUS

PDF

73.1 KB Created: 2021-04-23 09:59:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: aefe1cbcfc73213384cc6c0a0a074a99 SHA-1: eaed759179529f05aa7df9bf5e7d84d8d8d0c894 SHA-256: 5d189abf76abd0f1e5767a93c95a2667b67fa01dd0a452ff040ec5c838593325
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, suggesting a link farm designed to redirect users. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as Pdf.Phishing.Trojan. The document body, though heavily obfuscated, contains a URL related to router reset, which is likely a lure to disguise the malicious nature of the links. No scripts were extracted, but the overall structure and URL patterns are consistent with phishing or malware distribution campaigns.

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://jacksth.ru/strik?utm_term=how+to+reset+verizon+g3100+router PDF link annotation
    • https://finejorokisitoj.weebly.com/uploads/1/3/4/4/134495390/6269256.pdfIn PDF document text
    • https://cdn.sqhk.co/migiwepi/igolghh/hostel_building_plans_autocad_drawing.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369152/normal_5fc835fb7dc96.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381108/normal_6057ed06773b3.pdfIn PDF document text
    • https://sokifaxus.weebly.com/uploads/1/3/4/6/134666683/zuwulexejo.pdfIn PDF document text
    • https://cdn.sqhk.co/dedikunakudu/jeibQGA/idle_towers_and_creeps_codes.pdfIn PDF document text
    • https://cdn.sqhk.co/pimibopugugo/l9Rtihq/definite_indefinite_and_zero_articles_worksheet.pdfIn PDF document text
    • https://cdn.sqhk.co/nugilatunu/AfUhigh/38176466411.pdfIn PDF document text
    • https://xisofapetuv.weebly.com/uploads/1/3/4/7/134747578/tibafakuvisig-makuxatupi-mejaluwexulu-gulirivefab.pdfIn PDF document text
    • https://cdn.sqhk.co/bitowiso/X9hhgde/60303595745.pdfIn PDF document text
    • https://cdn.sqhk.co/dodirijobadi/fjd1a9v/siferiwubim.pdfIn PDF document text
    • https://cdn.sqhk.co/fikalibumi/jan81g7/zifokowavazabixulumox.pdfIn PDF document text
    • https://cdn.sqhk.co/togixulala/2gdujbw/47102971119.pdfIn PDF document text
    • https://cdn.sqhk.co/bosesegivu/zghWlRC/fun_race_3d_mod_apk_revdl.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d7c9079-a124-4062-a0f9-1bf02634ac84/47479186841.pdfIn PDF document text
    • https://s3.amazonaws.com/sagotomagin/new_practical_chinese_reader_textbook_1_2nd_edition_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e50ef45-0482-43a4-9167-8e8ba9fa5721/nefunumigudagupekino.pdfIn PDF document text
    • https://s3.amazonaws.com/setaxilitozuko/35657764313.pdfIn PDF document text
    • https://s3.amazonaws.com/gurafoga/are_blood_pressure_monitors_in_drugstores_accurate.pdfIn PDF document text
    • https://s3.amazonaws.com/kelukakeb/kovofaposezixifivabikum.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_off0000e1be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1BE 5132 bytes
SHA-256: 9aa0f8c26b1c52b8f487cb7fe2d846334042c7ee4dad5117fd6df6b0d56b17a9
font_01_sfnt_off0000f371.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF371 10556 bytes
SHA-256: 76ab61c200dd88b03426fabd33344237a4cc4c72eed98d2500062f7e475ec847