Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6a285c53cb9d28c…

MALICIOUS

PDF

73.5 KB Created: 2021-03-17 00:59:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-04
MD5: c0963d1123065960421f10b8dc11b2b6 SHA-1: e15a7779cab1b74bcc3f3dbe5c51b33f44da7260 SHA-256: f6a285c53cb9d28c9a185657878c073e5559e35ddd79f04e62181c5cadb99fb3
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The embedded document body, though heavily obfuscated, appears to be related to search terms, further supporting the link farm hypothesis. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://nipisod.ru/strik?utm_term=the+courage+to+be+disliked+amazon+uk PDF link annotation
    • https://jowopuvuramikir.weebly.com/uploads/1/3/5/3/135313070/juxipitirasarog_kivoveteta_jawuwafofebis.pdfIn PDF document text
    • https://jiwejezagaxu.weebly.com/uploads/1/3/5/3/135325467/votum_ludobofap.pdfIn PDF document text
    • https://mefupawex.weebly.com/uploads/1/3/4/3/134317460/1911293.pdfIn PDF document text
    • https://pukaxixuzex.weebly.com/uploads/1/3/4/4/134492253/4d4bf5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383573/normal_6019ff835c13d.pdfIn PDF document text
    • https://juzubuju.weebly.com/uploads/1/3/4/7/134703155/66c5b77f31e9f1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481422/normal_601a74e27a0aa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417325/normal_6011ec4e42e15.pdfIn PDF document text
    • https://nerupeke.weebly.com/uploads/1/3/1/4/131483009/3115752.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404959/normal_5ffdb53288343.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418984/normal_5fd7b19d4d8b8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412768/normal_600839b4431a0.pdfIn PDF document text
    • https://semazuxogevagox.weebly.com/uploads/1/3/4/0/134017751/mifolus.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421354/normal_5feb4f15e8cb5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389571/normal_5ffa89dceff4d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388412/normal_6030202ed2177.pdfIn PDF document text
    • https://bixowupe.weebly.com/uploads/1/3/1/4/131409305/zixibujabezos.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/19501235-83d8-484e-a972-a9ed28c94257/pokemozajimofulixu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8480dd4f-e8ff-4464-9b94-e670f0f5f67f/how_much_does_it_cost_to_get_certified_for_eyelash_extensions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1b95d90-06a4-4067-b042-9f3b6d6d4f00/pearson_edexcel_igcse_chemistry_student_book_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2dc214f-64e8-46bb-aeab-0ba53384a497/2150775627.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11dfc8c4-f98f-4728-b6d8-a55df64183b6/88463527893.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_off0000de5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE5F 5556 bytes
SHA-256: bade5d05df50ca343e952ee0f5781a4597ae9724f1f8ae6c2f52a4635548e9ee
font_01_sfnt_off0000f11e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF11E 11004 bytes
SHA-256: ed9fd8f93d45e9e81d315bb9d75f3b8103a05f6e655b1a63dad2affce164ef80