Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9b8940ed8c0ed3d…

MALICIOUS

PDF

66.6 KB Created: 2020-11-09 18:46:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bf70218709eb47e3efbd3c68b51068a5 SHA-1: 705ac20dc92f69f6f03c25b40ff66a5d1e3ab994 SHA-256: b9b8940ed8c0ed3d43e47e9d43d76260f1912a6477b2a394745cba60724980bb
156 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, suggesting it is part of a link farm or phishing operation. The embedded URL 'https://trafffe.ru/aws?keyword=video+games+website+names' is a primary indicator of the lure used to attract victims.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafffe.ru/aws?keyword=video+games+website+names
    • https://cdn-cms.f-static.net/uploads/4414677/normal_5fa30dd9e91b5.pdf
    • https://xujaxivef.weebly.com/uploads/1/3/1/4/131438557/13df09d87a.pdf
    • https://cdn-cms.f-static.net/uploads/4366655/normal_5f9377eff31ad.pdf
    • https://cdn-cms.f-static.net/uploads/4368468/normal_5fa8e5e66352f.pdf
    • https://cdn-cms.f-static.net/uploads/4366385/normal_5f8c1c4d045ec.pdf
    • https://mizitixas.weebly.com/uploads/1/3/4/5/134589849/koroganovanururireb.pdf
    • https://cdn-cms.f-static.net/uploads/4402712/normal_5f9be27a6f767.pdf
    • https://cdn-cms.f-static.net/uploads/4369153/normal_5f8f97f733479.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/9f36b127-0540-4441-9dbc-18ba17874178/domivuvoxoboniw.pdf
    • https://s3.amazonaws.com/pusolefosex/85828004901.pdf
    • https://uploads.strikinglycdn.com/files/c22e6baf-c026-49ab-a8f3-cdee9398086e/monexaj.pdf
    • https://uploads.strikinglycdn.com/files/cf5f0553-ae0d-4e8e-ab6f-ccac0124a6fc/answer_a_survey_question_to_continue_reading.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_off0000c7da.bin
a416bef9cd8cbddcafe405cd3ac82e00be890058cfb4453e88dd672f701653b7
pdf-font-stream PDF embedded font (sfnt) at offset 0xC7DA 5212 bytes
font_01_sfnt_off0000d99b.bin
e2a1468cb9c6f1e9803fb86363fc8068e6aae47382e2cab61801c9753b6f5482
pdf-font-stream PDF embedded font (sfnt) at offset 0xD99B 10704 bytes