Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff237b6a840583da…

MALICIOUS

PDF

135.0 KB Created: 2021-03-30 13:42:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-04
MD5: a0a34518bb9f8fa87a749d84c5f3d443 SHA-1: dd8dbfaa92da070f3deed0abdbfed8032399acfc SHA-256: ff237b6a840583da9f6ac9f20ea4fd87c105aa649c4c58c067e249d9af081e20
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 lure. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards techniques used for distributing malicious content or redirecting users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://ponafet.ru/strik?utm_term=champion+dual+fuel+generator+9000+parts PDF link annotation
    • http://najisemure.medianewsonline.com/binomial_pairs.pdfIn PDF document text
    • http://jifarobajis.sportsontheweb.net/69730745144.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417536/normal_602253746ac82.pdfIn PDF document text
    • http://fopokigife.mywebcommunity.org/15263887143.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458413/normal_603aac63812c0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417999/normal_604cf6c7d7f3b.pdfIn PDF document text
    • http://vexasefagi.scienceontheweb.net/marketing_project_file_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451369/normal_5fd864f190778.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4428329/normal_5fe37371454cf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470683/normal_60567e8c5ebcb.pdfIn PDF document text
    • https://vadukoku.weebly.com/uploads/1/3/4/7/134707593/7979252.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405430/normal_605a605cc97c4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489041/normal_600ecc7313825.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384028/normal_6038c390e30a3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418781/normal_6014afc02b195.pdfIn PDF document text
    • https://luzafoku.weebly.com/uploads/1/3/0/8/130814295/7fa2b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4529024/normal_603649cfd328f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427526/normal_60393b7ed9781.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/d46d50ba-7847-4275-af5e-712dbd1a2b48/96147712279.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9fb764a8-129e-4411-8841-d52db73e68a6/moon_phases_lesson_plan_4th_grade.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dcab16cb-b454-41c6-816d-478e580b17b3/23966903440.pdfIn PDF document text
    • http://vexolofifete.atwebpages.com/47787792.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6ffe648-eef1-4039-ac83-e5bf5f1a2d9f/icom_ic_746_pro_mods.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cfa99275-bc43-48fa-be54-945e935170b8/1488446252.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00019a70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19A70 5656 bytes
SHA-256: f296b3e45d07b46150f3d19dbfcdc151d6983c0fc0f68a8eef6a212fbdbca951
font_01_sfnt_off0001ad82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AD82 17732 bytes
SHA-256: 38e86a4844470769b8db25403fe7329e4f134757379bcc3e407d420e001342d4
font_02_sfnt_off0001e776.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E776 16512 bytes
SHA-256: f3e02129bff4cbbc934b01e18f431f77722967162bacd7e1c6c07dada7d1acfe
font_03_sfnt_off0001fded.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FDED 6164 bytes
SHA-256: 16a5dd7f8a88ccfbf179313e51369f81f7d41db5f0614ded099675b2dab90259