Malicious PDF — malware analysis report

Static analysis result for SHA-256 f95b267b64636551…

MALICIOUS

PDF

87.8 KB Created: 2020-11-29 07:03:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0df182513c7fd591a3676e253d832f65 SHA-1: 7674485da459a4e4bba32535b7a3aa12622af2fb SHA-256: f95b267b64636551f98c8b07d5cba974a2d961c0aae7d01d43ba0e3472d4e957
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a large number of external links, many pointing to other PDF files hosted on external services, indicating a link farm or SEO manipulation tactic. One of the primary external links is to 'trafffi.ru', which is suspicious. The document body, though heavily corrupted, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create PDFs from web content.

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://trafffi.ru/strik?utm_term=paul+zeitz+problem+solving
    • https://kelutatu.weebly.com/uploads/1/3/4/5/134521402/jawusijinuvutak_jizuvow.pdf
    • https://beretukajawedu.weebly.com/uploads/1/3/4/7/134713042/143f6b.pdf
    • https://zibeselev.weebly.com/uploads/1/3/4/1/134131471/f1672414b2e6.pdf
    • https://panirosarukiza.weebly.com/uploads/1/3/4/1/134132539/guruxeb.pdf
    • https://luxoxika.weebly.com/uploads/1/3/4/8/134899107/bobetoba_sinaxe.pdf
    • https://buzapakamewogu.weebly.com/uploads/1/3/4/3/134366326/67136baa.pdf
    • https://gapigapale.weebly.com/uploads/1/3/4/8/134896702/1581681.pdf
    • https://xemupawiked.weebly.com/uploads/1/3/4/3/134321325/doxumonawaxozig-zolimufeguxesel.pdf
    • https://kokubexajaluk.weebly.com/uploads/1/3/2/6/132681668/gewafowedaketu.pdf
    • https://wulenewovifof.weebly.com/uploads/1/3/4/5/134588468/4469e1ede8d.pdf
    • https://sisodiwitamusoz.weebly.com/uploads/1/3/2/6/132681746/e54ee.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/b5fc9a3f-20bb-4912-865e-b1d0fe9ee794/dasiwuzebi.pdf
    • https://uploads.strikinglycdn.com/files/b348ffa7-e4a1-4e5d-aad0-ab76c101cfd6/tesla_generator_blueprints.pdf
    • https://uploads.strikinglycdn.com/files/00694551-98d8-4d1d-9f80-a9026087c604/xumatazubiximuvisiliduwi.pdf
    • https://uploads.strikinglycdn.com/files/e0a5dc9e-e383-4de0-be5e-98c70aac5d9f/xeralupe.pdf
    • https://uploads.strikinglycdn.com/files/5d7f7235-98e6-46c7-85da-388e07c5633e/81211284164.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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00012349.bin
781b93aab97845f7bfb1099169f432a135c90ecbb9f33ad1bf6347b27c4f3bd9		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x12349 25808 bytes
font_00_sfnt_off0000e76a.bin
6ba8115054a2d4be82ddf994050631a7538948a0628ce5659e0cf4ad99d3554f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE76A 5392 bytes
font_01_sfnt_off0000f9b7.bin
441987326fefaa0c74e96b87ade90fd1e873042bc2980af27d6fb96430884194		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B7 12676 bytes

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