Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a792e54b5af85f0…

MALICIOUS

PDF

76.5 KB Created: 2020-12-10 23:59:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 94224788729c6b108d930d05ededec52 SHA-1: 74dbc9d750fa1440207c6f798424b5db48888bdb SHA-256: 3a792e54b5af85f02d3bab2f300377e340d6e9df24bb3c8cf0ddbfffd0a8eebd
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to S3 buckets, suggesting a link farm or SEO poisoning tactic. The primary external URI, 'https://trafficel.ru/aws?utm_term=albertine+in+five+times+pdf', is likely a lure to a malicious site. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

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://trafficel.ru/aws?utm_term=albertine+in+five+times+pdf
    • https://rakositove.weebly.com/uploads/1/3/4/5/134595637/0c4e0b0bd.pdf
    • https://pebiname.weebly.com/uploads/1/3/1/4/131453048/mugozupifuj-rozojiburot.pdf
    • https://xukoxaxap.weebly.com/uploads/1/3/4/7/134748194/823251.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/vatakefojunib/discuss_barriers_of_communication.pdf
    • https://s3.amazonaws.com/mijedusovineti/fabexogetob.pdf
    • https://s3.amazonaws.com/gawabog/75522676202.pdf
    • https://s3.amazonaws.com/susopuzupure/32974759418.pdf
    • https://s3.amazonaws.com/towutoginadivu/computer_hardware_engineer_interview_questions_and_answers.pdf
    • https://uploads.strikinglycdn.com/files/81928720-63fe-487d-953b-5480fcfea072/78306383380.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf568918e72e5fdbcebc18/1606375049609/favazevitab.pdf
    • https://s3.amazonaws.com/fatikonavori/69334756668.pdf
    • https://s3.amazonaws.com/wilugugo/35720760382.pdf
    • https://s3.amazonaws.com/fosagobomap/mewuwiropipokedewuwule.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe0041eaf37e3b646236c7/1606287436513/65349569975.pdf
    • https://s3.amazonaws.com/fotojipifuzitul/49995455527.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d85a.bin
64984227b2d14c31c55243c3c45d328289a464fe45dafc659afc2edca0fa4b79		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD85A 5164 bytes
font_01_sfnt_off0000e9d8.bin
4d03d6ffd1dd434d799c7ba24c6cc8fadb5ff79700d7132fcc5a0e12c3666fd0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D8 10764 bytes
font_02_sfnt_off00010dc0.bin
adc1ee55bd4533e2089990122fec03d329ec28ff989972852cf1c9d133c168ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10DC0 16280 bytes

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