Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e80b8d3916b4177…

MALICIOUS

PDF

70.2 KB Created: 2021-02-18 14:14:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: f3df90e03629419c56c63f6ab0377cc2 SHA-1: 426bcc2420ad3918ec44295a35167eb93828372f SHA-256: 8e80b8d3916b4177da5116182486d164a28c66fff109b0ee373865c0bc0997a8
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing operation. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://baarspo.ru/strik?utm_term=ruger+blackhawk+elite+pellet+air+rifle+gun+.177 PDF link annotation
    • https://kelogukagikuval.weebly.com/uploads/1/3/0/7/130739039/3392669.pdfIn PDF document text
    • https://cdn.sqhk.co/leluforeref/hgjkHGl/rovulofozobire.pdfIn PDF document text
    • https://cdn.sqhk.co/nesadatifu/l6didhh/kokowilu.pdfIn PDF document text
    • http://legendnat.space/linasopitu3rkwe.pdfIn PDF document text
    • http://help-feedback-amzn8.xyz/nintendo_switch_online_games2l9pe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414701/normal_602884dee4d87.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476273/normal_6022e5aa352fc.pdfIn PDF document text
    • http://garant-ritual.online/vr_v8_brake_boosterf0a6c.pdfIn PDF document text
    • https://webolubodu.weebly.com/uploads/1/3/0/9/130969971/xagibop_zubejazow_todejaboku_tirelibufilega.pdfIn PDF document text
    • https://cdn.sqhk.co/fovipobex/AgeigdG/backflip_challenge_carter_sharer.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408586/normal_5fe7d5b1a75dc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447646/normal_5fe82b2879b12.pdfIn PDF document text
    • https://cdn.sqhk.co/bomoxale/bhbgcoN/army_frontline_mission_counter_terrorist_wars.pdfIn PDF document text
    • https://cdn.sqhk.co/numavagoko/rWtC6jd/best_line_rider_track_download.pdfIn PDF document text
    • https://cdn.sqhk.co/jezumasulej/gchcghs/mopugakikufil.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/vibasujefir/biotechnology_test_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/joterige/bubble_tea_shop_business_plan.pdfIn PDF document text
    • https://s3.amazonaws.com/fenatagazise/charging_by_friction_conduction_and_induction_worksheet.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_off0000d37c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD37C 5568 bytes
SHA-256: 47a63c393af091762eada4280a5b685186a422414eb8e4ecae870c93c4a85538
font_01_sfnt_off0000e694.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE694 10744 bytes
SHA-256: dac3c1f1eef0a368fd65bfc311fc943ae6e1ca27d607b7f093b8e538d1fe7cf0

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