Malicious PDF — malware analysis report

Static analysis result for SHA-256 b26b09e06b94c70d…

MALICIOUS

PDF

78.4 KB Created: 2020-11-11 03:20:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6d719c5fc018acdd724d0aedc6e741c6 SHA-1: 19081289d150d28992903af8fccb48bdf9b2e41f SHA-256: b26b09e06b94c70d607fa082e82e4c16260bb4b5a9b06540b78ef718abfec8da
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, with one heuristic specifically identifying it as a 'PDF_SEO_LINK_FARM'. The ML classifier and ClamAV both flagged the file as malicious. The embedded URLs suggest an attempt to redirect users to potentially harmful sites, possibly for phishing or to host further malicious 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://traffine.ru/aws?keyword=sheryl+sandberg+speech+at+berkeley
    • https://dedeluruxizo.weebly.com/uploads/1/3/4/3/134305162/tozogiwar.pdf
    • https://buxijoxusezo.weebly.com/uploads/1/3/1/4/131483018/09da5b0b3c569fe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/cb0d20c1-7ebd-46b0-81a5-39439e2fb736/mario_bloopers_4.pdf
    • https://uploads.strikinglycdn.com/files/6adc6010-47ba-45e9-8ed5-607fe1d27336/7438211404.pdf
    • https://s3.amazonaws.com/radubozufiwo/82884869462.pdf
    • https://uploads.strikinglycdn.com/files/299fdfc5-ad7e-4a9c-96d4-3a1ace40f6a9/71138655566.pdf
    • https://s3.amazonaws.com/jumedemimo/51601808033.pdf
    • https://uploads.strikinglycdn.com/files/83495fc5-2c45-488b-aeb8-59362d83262a/main_theme_of_to_build_a_fire.pdf
    • https://s3.amazonaws.com/dojonuta/hollywood_babylon_1.pdf
    • https://s3.amazonaws.com/bubodeliza/relion_humidifier_replacement_parts.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_off0000f691.bin
7e363f213c627870d3e80b6840404a844fe4e1c4a525650190aaf98508b19460		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF691 5744 bytes
font_01_sfnt_off00010a1c.bin
6c235bc9a1e4c2bc4684163401723200fb70963b0405e6efece33d4fcae1f40c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A1C 10480 bytes

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