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)
MD5: 6eda07c70f0d1e1ad8591f55a6a06008 SHA-1: d349b7fc478c5c60868085577586728dded1cccb SHA-256: a8a4fa975f7efef7373e057b0ecceb1a0edf01bb3bdb33bcc36e30538cd13483
156 Risk Score

Malware Insights

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

The PDF document contains numerous external links, including one to 'trafftec.ru', suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate maliciousness. While no scripts were explicitly extracted, the PDF structure and extensive external links are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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
    • https://sowufaxekip.weebly.com/uploads/1/3/2/7/132710719/a9724cbe23.pdf
    • https://jizonuwuko.weebly.com/uploads/1/3/0/8/130814311/b166203bc99.pdf
    • https://kilogabofavelu.weebly.com/uploads/1/3/4/5/134589148/najozumenexapikoredo.pdf
    • https://cdn-cms.f-static.net/uploads/4454673/normal_5faab57e47781.pdf
    • https://lavuzolitad.weebly.com/uploads/1/3/4/3/134327879/kakawusamakelewuw.pdf
    • https://cdn-cms.f-static.net/uploads/4366007/normal_5f8704d4a8fb4.pdf
    • https://sibakixode.weebly.com/uploads/1/3/2/8/132814768/fd57c.pdf
    • https://cdn-cms.f-static.net/uploads/4369315/normal_5fae1fa920fe4.pdf
    • https://cdn-cms.f-static.net/uploads/4411273/normal_5f96d323d05c4.pdf
    • https://cdn-cms.f-static.net/uploads/4368479/normal_5f939cd0475f2.pdf
    • https://garigokowexe.weebly.com/uploads/1/3/4/4/134440629/5879954.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/susopuzupure/guriras.pdf
    • https://s3.amazonaws.com/bulikowexunepov/51632368595.pdf
    • https://s3.amazonaws.com/zoromexemuzid/indeed_assessment_test_answer_key.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a95b.bin
4d7365907f495c92a09cc1f62a455adb16fffd6e646a2cffd2b6a82ba7c01d35
pdf-font-stream PDF embedded font (sfnt) at offset 0xA95B 5508 bytes
font_01_sfnt_off0000bbfd.bin
0465f2ccc9dc9b12425e61bbab9e6644fdb36a6864f9eb9bf2b7ca8a077ca774
pdf-font-stream PDF embedded font (sfnt) at offset 0xBBFD 9468 bytes