Malicious PDF — malware analysis report

Static analysis result for SHA-256 3535f9bb9cc3e2b7…

MALICIOUS

PDF

96.8 KB Created: 2020-12-26 19:22:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 3a375f2b00753c9749265eb1c3d9f695 SHA-1: b4f1896b8203668d04e7cc8e66c36d7f95f44ced SHA-256: 3535f9bb9cc3e2b7da2fc52793d354fed18449cb144b4624d96d4038b549770a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of a large number of external links, including the primary URL 'https://traffset.ru/123?utm_term=nande+koko+ni+sensei', suggests it functions as a link farm or phishing lure. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards exploitation for client execution, likely initiated by user interaction with the embedded links.

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://traffset.ru/123?utm_term=nande+koko+ni+sensei PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4377924/normal_5f9eaf05241c9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414501/normal_5fcb6cc898aa4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417997/normal_5fa8fa0a04f32.pdfIn PDF document text
    • https://solupufaposedi.weebly.com/uploads/1/3/1/8/131857421/gelesuzejodanil-renudizonavam-gipezal.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403936/normal_5fb34a7b90397.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470543/normal_5fd619b59c3f7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401559/normal_5f96d231728b4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zeworibuzoza/26008697743.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/32984fa2-7dbc-4b95-b73f-ff74443255c8/14894479131.pdfIn PDF document text
    • https://s3.amazonaws.com/xapota/free_floral_border_templates.pdfIn PDF document text
    • https://s3.amazonaws.com/zakunafu/action_crack_mega.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_off000102ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102EC 11236 bytes
SHA-256: b32e26d4edb60569a6264d4c6f222a44300ce392cef26fb8d837f4f4aaa1b774
font_01_sfnt_off000127e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127E1 4724 bytes
SHA-256: 0d32b3296bbccf07c230ddc514fbbb73e3079e6afa5ee0d335e38e3c0de2ff6a
font_02_sfnt_off0001380c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1380C 12760 bytes
SHA-256: 3c65d253e16e80b947eb2b5ef48f7a6b51424e37e570c1a4ab0e7ec0cfdd48da
font_03_sfnt_off0001603b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1603B 16340 bytes
SHA-256: e32e0cd1add74b50ea25d2c0a6d277f2f88682663a80e3fb32cbf2eff7d47d7c

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