Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b3022a1fd5b9f7e…

MALICIOUS

PDF

76.0 KB Created: 2021-02-26 20:00:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 90a8e129fd078e44d74f2455bdd53a12 SHA-1: 1104f470d4470c25aa46b0b5bd37e67e07143ea9 SHA-256: 3b3022a1fd5b9f7eb7f7db09f9b49d1410cd09f432478561af6fdb8476bec8a5
206 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many hosted on disposable domains and link farms, indicative of a phishing or malware distribution campaign. The ClamAV detection and ML classifier strongly suggest malicious intent. The presence of embedded URLs and the structure of the PDF point towards an attempt to redirect users to malicious sites, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://seumenha.ru/strik?utm_term=holmes+oil+filled+heater+recall PDF link annotation
    • https://cdn.sqhk.co/moxelutedoje/hfzbjgQ/47572470601.pdfIn PDF document text
    • https://cdn.sqhk.co/bomemenun/Uvecjc3/royal_princess_run_royal_princess_island.pdfIn PDF document text
    • https://devigafaviv.weebly.com/uploads/1/3/4/6/134698058/b77be831.pdfIn PDF document text
    • https://cdn.sqhk.co/sesexibanobu/YgihfmH/prime_suspect_movie_1991.pdfIn PDF document text
    • https://cdn.sqhk.co/retuwami/hhuiinF/rs232_protocol_rts_cts.pdfIn PDF document text
    • http://jaralet.getenjoyment.net/68445892614.pdfIn PDF document text
    • https://vopuxobud.weebly.com/uploads/1/3/5/9/135974080/374fbf87f5d6.pdfIn PDF document text
    • http://confirmyourverifiedbadge.com/39590511013mkqc4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393521/normal_5ff6720831703.pdfIn PDF document text
    • http://profaudit32.ru/angka_penting_adalah7wztj.pdfIn PDF document text
    • https://cdn.sqhk.co/pifajaloro/HoKkhcH/best_sky_map_app_ios.pdfIn PDF document text
    • https://cdn.sqhk.co/gutemokerezo/ijgeLia/93923839237.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443824/normal_600b0220baf05.pdfIn PDF document text
    • https://cdn.sqhk.co/tarozawowe/QFhjbgi/83383831137.pdfIn PDF document text
    • https://towizitubozabo.weebly.com/uploads/1/3/5/4/135400713/kifaj.pdfIn PDF document text
    • http://fisareboveda.getenjoyment.net/how_to_get_google_maps_to_update_street_view.pdfIn PDF document text
    • https://cdn.sqhk.co/mudemodox/jhUgcib/the_return_forbidden_throne.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ligoroxenafof.atwebpages.com/5343003941.pdfIn PDF document text
    • http://namakanexir.atwebpages.com/5770940743.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_off0000eb03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB03 5220 bytes
SHA-256: d3727c08b6afa6afb3def15d96700e07fd443e277d5e8867afcaa362d666b8ec
font_01_sfnt_off0000fc91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC91 11132 bytes
SHA-256: e27e5b8ecb366b690ba4ef144bd13386113da058fcbfedc58715d78e22776985

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