Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ca04f4a07742b75…

MALICIOUS

PDF

107.1 KB Created: 2020-12-19 10:40:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: af8f30077c3dc62788fab75d6dfd2af5 SHA-1: be2e9b8dc74f982d9b760202b68a3d256973c51b SHA-256: 6ca04f4a07742b75f8f4c9b72ad19f31b02018c523f573d0c7a4844a7d5f1402
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic. The embedded URLs, such as 'https://trafffi.ru/strik?utm_term=tokyo+ghoul+all+episodes+in+order', suggest a lure to potentially malicious 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 0.9995

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://trafffi.ru/strik?utm_term=tokyo+ghoul+all+episodes+in+order PDF link annotation
    • https://widosutolitidaf.weebly.com/uploads/1/3/4/8/134847614/vonanigero-teduzu.pdfIn PDF document text
    • https://pegelukiratek.weebly.com/uploads/1/3/4/5/134503056/wavigopejamagezumi.pdfIn PDF document text
    • https://fukoxifixe.weebly.com/uploads/1/3/4/4/134460993/6156095.pdfIn PDF document text
    • https://belafawejogawol.weebly.com/uploads/1/3/4/5/134583754/jakadaworulozazur.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fdc80e9ff99f865bfec01c9/t/5fdcdd46b53c414880d1a0d6/1608310088024/conclusion_for_concrete_mix_design_lab_report.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff215b1a-cc4d-4100-8d7a-3686c881f5ab/59501947341.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14d2e072-d862-4678-9cc3-59fd2f7fb01f/wusizuxokesiditixoxal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1069f9d1-64ef-4810-a98b-c4d4c2fade56/31834082360.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d467008-f75b-4b3c-ade9-67b1b608dd28/42842475292.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53309a2c-1864-4b72-896f-59c85724c109/vebipezudufuv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/29edec9f-8ba8-4647-b7bf-f812518c7b80/21544720487.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/901855ef-8457-49b3-bcab-9c37e7c61f14/32108095702.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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d31c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD31C 37684 bytes
SHA-256: f6c8c9e59c069925342b1939f55b1c42faa11e5c638c58b1b108f310961878ef
font_01_sfnt_off000147db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147DB 5336 bytes
SHA-256: 62b644a5691bfdd4489d66f86d77419fbcfcc0d47a8db64834a2a496ca7fedfd
font_02_sfnt_off00015a06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A06 13112 bytes
SHA-256: e2cb173451177f6a1ac8cfa004e0093856f6a4f3bf1a4ded172a8453cddb43c7
font_03_sfnt_off000182cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x182CD 18100 bytes
SHA-256: f55538c13914c1d3640de883d7c3093e2a81fe4c1cb49d327a48da4838c351e9

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