Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc07968b34f77674…

MALICIOUS

PDF

73.9 KB Created: 2021-03-09 14:21:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 16efdfebde1df42771ed3601f0189641 SHA-1: d8685672c8cfc385450ce2c3d7aaa3daa6533bcd SHA-256: bc07968b34f77674aad40fdb18c64e11e976ce05783058a0dceb5dc44d728258
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 pointing to a suspicious domain ('xezojetit.ru') that is likely part of a link farm or phishing operation. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically related to phishing. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xezojetit.ru/award?keyword=acidosis+alcalosis+respiratoria+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/f5accab6-6a02-459c-882e-e1a5816b434d/easy_printable_hidden_pictures_kindergarten.pdf
    • https://144c9d4d-401b-437b-b89f-6a5816d7da47.filesusr.com/ugd/cd33f5_5806c51f39f649699eb7fec16b10217a.pdf?index=true
    • https://27475d5a-2981-497d-8cd5-0c310ef10f8b.filesusr.com/ugd/9cb927_5d69adc7b249444eb83441cc1d4d0bd1.pdf?index=true
    • https://90ff81fc-98d9-4e53-96a3-aaa5c1c2042e.filesusr.com/ugd/bb5aff_b2642b997c434687bdbd87e90c154934.pdf?index=true
    • https://ee42ee57-4547-4a8c-8a66-6cccb7f6869d.filesusr.com/ugd/2a9ad2_2bd436f942684d9284d9b724ef0c2b39.pdf?index=true
    • https://436240a4-ef10-404e-ad90-c5cab949c7af.filesusr.com/ugd/3fb742_8e2252a05f494ca18e8cb3e17f3129a9.pdf?index=true
    • https://4a1cfc67-5981-466d-a13b-75576fe7431f.filesusr.com/ugd/64e449_3bf731c3eef64ee5bcc5d327c9e616ce.pdf?index=true
    • https://uploads.strikinglycdn.com/files/a97cc1c5-977c-4c69-8087-005fb33dbee1/vibagaxekute.pdf
    • https://uploads.strikinglycdn.com/files/a3f53e25-d29f-4342-9f03-8a33b7e92988/2124995993.pdf
    • https://d8d078ea-10ec-4787-8e21-ef6e32b87a24.filesusr.com/ugd/8f6098_b89cc7e3e06845be9cd75246da712715.pdf?index=true
    • https://b32521b7-32ca-447e-9967-d27d0dce683d.filesusr.com/ugd/800b88_ef363837bdad4115be13edb3650631d4.pdf?index=true
    • https://f05e0dbb-21cf-40ea-8b71-00b8d6f49a3b.filesusr.com/ugd/b09e1d_ba6b981ed67e498588f5aab9470ab49f.pdf?index=true
    • https://43cb2d18-1589-43a7-b1c5-fe1278e1c76d.filesusr.com/ugd/370b54_c7b7cff6d05b4752b4800e1208f46b8b.pdf?index=true
    • https://s3.amazonaws.com/gowebabuxogiro/51923877362.pdf
    • https://s3.amazonaws.com/juwofuxufijup/ampli_sono_qsc_rmx_850.pdf
    • https://uploads.strikinglycdn.com/files/4ea4b992-c674-4962-bf29-a442ca31c07b/xagaxonurupubefasi.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_off0000e28e.bin
126f0b4c73d53e4b0d6cc597085aceb39aeae61950856c10ece72dbe683139b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE28E 5140 bytes
font_01_sfnt_off0000f41c.bin
2a05b0ff8cc5d52e4344879fe0fef8fdad05361a6095e1541ef7fbe66dd25ded		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF41C 10888 bytes

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