Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bbf953550d60876…

MALICIOUS

PDF

68.0 KB Created: 2020-11-17 16:11:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cb03e564c889b6140c8eb295d904ce1f SHA-1: 13211923da680e331c5d4514f42113f261affd08 SHA-256: 0bbf953550d608769d90caa1975cf653978036abfa6aa5edca3c946f926c77fe
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, including one pointing to 'trafffi.ru', which is likely a phishing or malicious site. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting an attempt to manipulate search engine results or direct users to potentially harmful content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

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://trafffi.ru/123?utm_term=6th+grade+science+study+guide+answers
    • https://cdn-cms.f-static.net/uploads/4394073/normal_5f9da011e26b8.pdf
    • https://legawugo.weebly.com/uploads/1/3/4/5/134509979/tupekixanen_pedosup.pdf
    • https://cdn-cms.f-static.net/uploads/4369905/normal_5f88fa3126e40.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/37850934-701a-4936-8ee4-ac04223649d6/westek_light_timer_instructions_te02.pdf
    • https://uploads.strikinglycdn.com/files/dd89fe69-6c69-44f5-838c-2d37a911375a/gimabokadageju.pdf
    • https://uploads.strikinglycdn.com/files/b0245f58-01ab-449c-af7b-3e8007f55d7a/85358631578.pdf
    • https://uploads.strikinglycdn.com/files/836d2927-d9be-494a-8d9a-8f5c88a3a964/37995632439.pdf
    • https://uploads.strikinglycdn.com/files/1dce502d-75dd-4bce-bb73-2b49f18ec631/sabapakidafum.pdf
    • https://uploads.strikinglycdn.com/files/588521a3-8061-42da-91be-9c7c40712179/bower_wilkins_p3.pdf
    • https://uploads.strikinglycdn.com/files/9034293c-ae65-47fc-8f4a-403bc4a57455/35877556750.pdf
    • https://uploads.strikinglycdn.com/files/8b8e5452-b182-4898-9ea4-4bd0ff323806/13016087026.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_off0000cdfb.bin
39b04c6620f1b0e19540a9bbb8f3c3e0ae9e26fa0b477b6914c19d1f84ffb1b4
pdf-font-stream PDF embedded font (sfnt) at offset 0xCDFB 5420 bytes
font_01_sfnt_off0000e07c.bin
a9cce61601594115b882eaab972fb2b9809d8774527139c8ad549ee313a7f502
pdf-font-stream PDF embedded font (sfnt) at offset 0xE07C 10080 bytes