Malicious PDF — malware analysis report

Static analysis result for SHA-256 7660cf7df89e17e1…

MALICIOUS

PDF

80.7 KB Created: 2021-04-07 19:19:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-04
MD5: d0e427be23ef58e87f8fb9141f1d0bfb SHA-1: 763c9e79c92689a8f6d990d37925bdcf99147c6b SHA-256: 7660cf7df89e17e1b9451c363d6710de1c711de11ef3afc75f2c3f0f9f66c24c
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting or unknown domains, suggesting a link farm or SEO spam campaign. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to malicious sites, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://zajinet.ru/strik?utm_term=weber+smokey+mountain+18+parts+list PDF link annotation
    • https://s3.amazonaws.com/bisapovepizaj/faxin.pdfIn PDF document text
    • https://s3.amazonaws.com/fedure/68748819284.pdfIn PDF document text
    • http://xxlmature.site/pagabasipuferunokuh97f.pdfIn PDF document text
    • https://cdn.sqhk.co/xekawiba/hdV0Sli/photo_editor_app_with_sparkle_effect.pdfIn PDF document text
    • https://cdn.sqhk.co/dujagazatad/NghFidX/17588974507.pdfIn PDF document text
    • https://cdn.sqhk.co/nedupugifuka/ginhcia/pirates_pearls_match_build_design.pdfIn PDF document text
    • http://ita-fitness.fun/the_uses_of_enchantment_summaryyjh2b.pdfIn PDF document text
    • http://tradebot.space/forgotten_realms_collectionye015.pdfIn PDF document text
    • https://cdn.sqhk.co/zibomevuguli/fbciim0/duvodakotowaja.pdfIn PDF document text
    • https://s3.amazonaws.com/fuwenoxuzasila/letter_format_in_english_for_school_principal.pdfIn PDF document text
    • http://fbdirect.site/a_critical_survey_of_indian_philosophy_free_downloadrc8kt.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/f3b16c32-2e8d-4a80-b0e2-be97930664d8/3202620399.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/823c2a46-d78c-49ba-a446-fcb38b2a03d1/nordyne_furnace_error_codes.pdfIn PDF document text
    • https://caa91486-5fcc-43b7-8b2b-5b817ae85bbe.filesusr.com/ugd/26bbcf_f8249cb2f27341e1b3f285b94db938c6.pdf?index=trueIn PDF document text
    • https://6ddb26ad-aa8e-4a3e-a925-5cef6fc035e1.filesusr.com/ugd/d3d820_0d7113bec957495282d3a0ccdad8ed08.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/92ffeab5-6626-41cb-a97e-de012670a1dc/actiontec_wcb3000n_setup.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f401.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF401 5528 bytes
SHA-256: 926a0bf204cc87889cde9c4c473742f633cf048650e6f3f582ab25a8b81695ed
font_01_sfnt_off000106c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106C5 1912 bytes
SHA-256: 80a4cfd859b9bb1e8faa36d0b2de836cd4647eeb869bd113d8e2047271df502c
font_02_sfnt_off00010ff4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FF4 11092 bytes
SHA-256: 9af532767682c65e3455547dbcd640f8df2d189cef7314147ae4eab989bfd911