Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5060a19c07a0095…

MALICIOUS

PDF

85.2 KB Created: 2020-11-10 19:20:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9e894e60b07a68506066cf8fe23162dd SHA-1: 7a12877f3b9abca898a94697130bd4f2809083b3 SHA-256: f5060a19c07a00951417119087d5c20546dd1b905b7aa854ecd27bdde8251070
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, which is a common tactic for SEO spam or phishing. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially harmful sites.

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://trafffe.ru/aws?keyword=tipo+de+datos+sqlite
    • https://cdn-cms.f-static.net/uploads/4366047/normal_5f8b65a409b45.pdf
    • https://cdn-cms.f-static.net/uploads/4387408/normal_5f8dc53699647.pdf
    • https://xikewewojan.weebly.com/uploads/1/3/4/0/134095915/7217.pdf
    • https://bobejezesolaz.weebly.com/uploads/1/3/4/6/134622741/9405241.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/e0e3b8ad-e54a-431a-92e6-ebf743913a29/a_fragmentary_passage_trophies.pdf
    • https://uploads.strikinglycdn.com/files/093faad9-276a-4bf6-870c-077c023d1150/pazilubukasuzoja.pdf
    • https://s3.amazonaws.com/vawoginele/88944279669.pdf
    • https://uploads.strikinglycdn.com/files/f5a68da0-d386-4555-8466-61f0ba75ee2d/jasiz.pdf
    • https://s3.amazonaws.com/dinilederu/gareso.pdf
    • https://uploads.strikinglycdn.com/files/84676f22-d02c-4722-98c5-17cf3dbc45ee/7372760398.pdf
    • https://uploads.strikinglycdn.com/files/4619b6a2-53f9-4530-8a1a-b19d4336b0c2/zawawamemofaxe.pdf
    • https://uploads.strikinglycdn.com/files/2ae4d827-af84-4d4f-96aa-87c6115f7610/general_chemistry_mcquarrie.pdf
    • https://uploads.strikinglycdn.com/files/3d756076-d0df-4023-b725-2133e858c50d/jixez.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db10.bin
aaef848063ead7cf891d389d1865d50fe81032cfbcff36e9c000227f267ce5f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB10 13212 bytes
font_01_sfnt_off00010394.bin
ca735261b45c0560aa843a0df78156529872d39399f488196ccca4a3a8d88be1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10394 4612 bytes
font_02_sfnt_off00011344.bin
1d01db60d8a9c0b3ee066bc8db2fd25524a2c056cac52ee9d6621f4a275dfabe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11344 11220 bytes
font_03_sfnt_off00013933.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13933 4324 bytes

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