Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8a4fa975f7efef7…

MALICIOUS

PDF

58.2 KB Created: 2020-11-13 10:40:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 6eda07c70f0d1e1ad8591f55a6a06008 SHA-1: d349b7fc478c5c60868085577586728dded1cccb SHA-256: a8a4fa975f7efef7373e057b0ecceb1a0edf01bb3bdb33bcc36e30538cd13483
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO spam operation. One embedded URL, 'https://trafftec.ru/123?utm_term=bose+micro+soundlink+pairing', is particularly noteworthy as it appears to be a redirector.

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://trafftec.ru/123?utm_term=bose+micro+soundlink+pairing PDF link annotation
    • https://s3.amazonaws.com/susopuzupure/guriras.pdfIn PDF document text
    • https://s3.amazonaws.com/bulikowexunepov/51632368595.pdfIn PDF document text
    • https://s3.amazonaws.com/zoromexemuzid/indeed_assessment_test_answer_key.pdfIn PDF document text
    • https://sowufaxekip.weebly.com/uploads/1/3/2/7/132710719/a9724cbe23.pdfIn PDF document text
    • https://jizonuwuko.weebly.com/uploads/1/3/0/8/130814311/b166203bc99.pdfIn PDF document text
    • https://kilogabofavelu.weebly.com/uploads/1/3/4/5/134589148/najozumenexapikoredo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454673/normal_5faab57e47781.pdfIn PDF document text
    • https://lavuzolitad.weebly.com/uploads/1/3/4/3/134327879/kakawusamakelewuw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366007/normal_5f8704d4a8fb4.pdfIn PDF document text
    • https://sibakixode.weebly.com/uploads/1/3/2/8/132814768/fd57c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369315/normal_5fae1fa920fe4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411273/normal_5f96d323d05c4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368479/normal_5f939cd0475f2.pdfIn PDF document text
    • https://garigokowexe.weebly.com/uploads/1/3/4/4/134440629/5879954.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000a95b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA95B 5508 bytes
SHA-256: 4d7365907f495c92a09cc1f62a455adb16fffd6e646a2cffd2b6a82ba7c01d35
font_01_sfnt_off0000bbfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBFD 9468 bytes
SHA-256: 0465f2ccc9dc9b12425e61bbab9e6644fdb36a6864f9eb9bf2b7ca8a077ca774