Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d8cace51b99d910…

MALICIOUS

PDF

80.8 KB Created: 2020-12-20 18:42:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 2a88e1130b502e25dc530cefe0edab66 SHA-1: 4134ef3cbe077a87621715514e666b865870963f SHA-256: 5d8cace51b99d9101d76e83decbd1ed423b8088a11dc8999d7972baa23fbb424
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 pointing to a suspicious domain ('trafffe.ru') that is likely part of a link farm or phishing operation. The ClamAV detection and ML classifier strongly indicate malicious intent, classifying it as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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/123?utm_term=jacob%2527s+ladder+electricity+ghost PDF link annotation
    • https://pazijovipa.weebly.com/uploads/1/3/4/3/134327002/faxil.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482218/normal_5fdad653e5563.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374188/normal_5fce8ac6c556d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/f25c7fc0-3284-4d9a-946e-2340b09079b7/felixelepud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/303e9f47-c846-47e5-80ac-989453ee0357/30119503983.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67580c8c-cbad-4847-8e71-a80b5eba6a36/xapokosunuginisifotaw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f222543-9443-4897-a909-77d628a9b8f8/87374739209.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxutedi/lumber_tycoon_2_script_lua.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2347ab98-a93a-4675-a61e-aff79805bdfa/82290666866.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0fe386b97992eb55c938e/t/5fcbb454da45e86ccaa9d966/1607185495718/61221085333.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2cfe56ef-1a04-4723-9d4f-bafb0ba0a743/kipisekewamemilagilapogo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa8f5b01-f151-48e2-b7e9-bed01fdad326/xofedilimukaj.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc56ff268612547ed7c87b1/t/5fcfe56a81f2a656f3fcdf97/1607460203229/29219681365.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7297b3cb-fbf5-49db-9be8-2fdfd971f6cf/metazapibebazuwobiga.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c07c430-44bb-4f6c-a458-3564395e7938/types_of_multimedia_in_education.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00010cb4.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x10CB4 23004 bytes
SHA-256: 386fd2a61679a6a1823cbaaca599ae88cda0ca3a7a346f65d73b98c415a1ac70
font_00_sfnt_off0000d5a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5A2 5464 bytes
SHA-256: 254ee795ebd73dc9816de9a3de387530724632fd691487b3aba38f7ce6d94e36
font_01_sfnt_off0000e834.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE834 10680 bytes
SHA-256: 9c926d1b64be00bc10869f77e1a0a3d8ce74361113a73ac4aa46e304fe57a18f

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