Malicious PDF — malware analysis report

Static analysis result for SHA-256 35e89ec1e15abb39…

MALICIOUS

PDF

69.4 KB Created: 2020-12-04 06:19:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ca15de493aa6cab58d9ec23debc41cab SHA-1: bb7e6a5affa41deeaf382cf1abdaf1c2eab24ef1 SHA-256: 35e89ec1e15abb392519cd2e3e44509b2042efbe92738330efa9cd0581db960c
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, with one heuristic specifically identifying a 'PDF link farm'. The presence of the URL 'https://trafficel.ru/123?utm_term=what+is+hci+in+biology' and the heuristic 'PDF_SEO_LINK_FARM' strongly suggest a malicious intent to direct users to potentially harmful websites. The ML classifier and ClamAV detection further support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9877

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://trafficel.ru/123?utm_term=what+is+hci+in+biology
    • https://dudakodut.weebly.com/uploads/1/3/4/4/134497067/kiwuwo-zevab.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/fcf5c00a-3a51-4d21-8561-6e5758273f78/kegaf.pdf
    • https://static1.squarespace.com/static/5fc0d650403f5353fd956949/t/5fc17faef3de5e49b59d43a2/1606516655384/47684776727.pdf
    • https://uploads.strikinglycdn.com/files/283545f4-911b-4a74-bfbe-6e05b14fe7ee/nikopolelanasizizijol.pdf
    • https://uploads.strikinglycdn.com/files/35f1ee5d-6666-46e2-a286-fb0f01dddea6/dremel_polishing_kit_684.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf5d9ef81c9a2a0c9997bb/1606376865415/blown_to_bits_chapter_6.pdf
    • https://uploads.strikinglycdn.com/files/e4f27e35-30ed-4ab0-b60b-68e5e1b749e8/39612802613.pdf
    • https://s3.amazonaws.com/dozuga/singh_is_bling_movie_download_480p.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_off0000d403.bin
514e00f6fe91aa47c6d8b3b3759cb7c7442ef08fb1541db900ae6c8bb89caa39		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD403 5220 bytes
font_01_sfnt_off0000e5e0.bin
af097d45983e1588ecadffb67e95d3babb78e2f3c838b96662f5bd492f64e3e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E0 10468 bytes

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