Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdb5d4704abe84d8…

MALICIOUS

PDF

79.3 KB Created: 2021-01-12 01:07:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 7b4061528408a353f21a5b390bb0d55b SHA-1: b3402b18e1724110f9e890276abf75fe83a78be1 SHA-256: cdb5d4704abe84d8e6d11203271b8ff051e2480ca6a8202a0bc6bb58672dc641
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many of which are to other PDFs, suggesting a link farm or SEO spam campaign. The ML classifier and ClamAV both strongly indicate maliciousness, with ClamAV identifying it as Pdf.Phishing.Trojan. The document body, though heavily obfuscated, contains metadata related to 'Gta vice city hidden packages vice point' and the authoring application, further supporting a lure-based attack. No scripts were extracted, but the presence of numerous external URLs points to a redirection or phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/123?utm_term=gta+vice+city+hidden+packages+vice+point PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4383138/normal_5f955bab161f2.pdfIn PDF document text
    • https://jagunafine.weebly.com/uploads/1/3/4/3/134363358/113a1.pdfIn PDF document text
    • https://site-1174602.mozfiles.com/files/1174602/sandwich_near_me_oakland_ca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372740/normal_5f980edb7658f.pdfIn PDF document text
    • https://dujenavu.weebly.com/uploads/1/3/4/3/134366251/wagesidodap_dizim_penokuzajoluxeb.pdfIn PDF document text
    • https://site-1175762.mozfiles.com/files/1175762/nififizibox.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501479/normal_5fcd5f1a82843.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495839/normal_5fc7b2ee7806c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419192/normal_5fe9c9e623c56.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409623/normal_5fb4a6a081f5d.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/xefejevife/52170049347.pdfIn PDF document text
    • https://s3.amazonaws.com/vuzufexarevima/34433782499.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f899.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF899 5464 bytes
SHA-256: 85f52d1a51cbb173ca89da6b94f9c01a6847c1fdfe9ae9850c75f5e46f4d167f
font_01_sfnt_off00010b46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B46 10980 bytes
SHA-256: 9819a0def314ef777cf8efa106d1017d1d92605386d8ff4a35940ef0239bf270

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