Malicious PDF — malware analysis report

Static analysis result for SHA-256 963fbf52b4640eca…

MALICIOUS

PDF

67.9 KB Created: 2020-11-10 12:30:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fe63c013d1733e9fd14b4878dff20096 SHA-1: 7e4cc6882e826628c0347a73677a8dfbec0c9763 SHA-256: 963fbf52b4640eca574a652900273e7ce9361cf8f0423a86e47d7fb5433aae64
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high probability of malicious intent. Heuristics identified a large number of external links, suggesting a link farm or phishing attempt. The embedded URL 'https://traffine.ru/strik?keyword=can+you+download+apk+on+ios' is a primary indicator of this malicious activity.

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-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://traffine.ru/strik?keyword=can+you+download+apk+on+ios
    • https://nigefawami.weebly.com/uploads/1/3/4/5/134598638/52119.pdf
    • https://guwomenod.weebly.com/uploads/1/3/0/8/130873843/mofep.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/5dd8d6d7-fd14-473a-8c47-7922931fef34/14274692463.pdf
    • https://s3.amazonaws.com/gupuso/91725444773.pdf
    • https://uploads.strikinglycdn.com/files/a4a22b4d-3425-4724-b0e8-e5a4b3e16130/hunter_irrigation_controller_manual.pdf
    • https://uploads.strikinglycdn.com/files/08d9c5f0-6bcd-4cf5-8076-7aab3278f4c2/bulifogorukoganakof.pdf
    • https://uploads.strikinglycdn.com/files/fb12fba0-c166-46d6-865f-3b211bbcc486/16073677952.pdf
    • https://uploads.strikinglycdn.com/files/bd79d1da-7938-44b6-979c-57b275d4ed10/pevoxikedul.pdf
    • https://s3.amazonaws.com/vebogotexaf/71968943714.pdf
    • https://uploads.strikinglycdn.com/files/a80ac714-c097-4f83-81c4-40a9bc364fd1/girl_scout_ambassador_badge_requirements.pdf
    • https://uploads.strikinglycdn.com/files/84241666-7cd7-4ab9-a47a-ca18994acde9/20522874122.pdf
    • https://uploads.strikinglycdn.com/files/2f50e778-3af8-41ce-93bd-71ec429266fb/frsky_qx7_manual.pdf
    • https://uploads.strikinglycdn.com/files/62aea2ef-2cd7-41cc-b782-7be621132a59/40097014991.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_off0000cdca.bin
20ed52c484b79cc8bb82a706032e2497deb7333d4e5e4a249621f274fab7d041
pdf-font-stream PDF embedded font (sfnt) at offset 0xCDCA 5020 bytes
font_01_sfnt_off0000df0b.bin
be7003c94267a9ab0c5b03acb31575e4b4c34cb7325987e8302729212f84cdc9
pdf-font-stream PDF embedded font (sfnt) at offset 0xDF0B 10352 bytes