Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f2a71edec8448da…

MALICIOUS

PDF

71.9 KB Created: 2020-12-03 20:56:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 4e150aa49c736a7ec89e15c92ff11bc4 SHA-1: dbeaf7d8355bafffb328bdb43665b8c5c6869155 SHA-256: 4f2a71edec8448da21614f2dab3386a0d02b5a04aecd06bab8dcfe46c7cbfd7a
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are to benign-looking documents, but one specific URL, 'https://trafffe.ru/123?utm_term=age+of+ishtaria+guide', is flagged as unknown and is likely part of a link farm designed to direct users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafffe.ru/123?utm_term=age+of+ishtaria+guide PDF link annotation
    • https://lajawenofuki.weebly.com/uploads/1/3/4/5/134501859/genudubo.pdfIn PDF document text
    • https://jupovibofekek.weebly.com/uploads/1/3/4/4/134490290/1148515.pdfIn PDF document text
    • https://suranetu.weebly.com/uploads/1/3/4/4/134458043/336a1c82a9a2d.pdfIn PDF document text
    • https://dudepemak.weebly.com/uploads/1/3/4/7/134702006/2061297.pdfIn PDF document text
    • https://varusimutajol.weebly.com/uploads/1/3/4/5/134502614/7337239.pdfIn PDF document text
    • https://gozaxuvo.weebly.com/uploads/1/3/4/6/134612917/ad3dd.pdfIn PDF document text
    • https://jomojakadawubo.weebly.com/uploads/1/3/4/4/134448567/xamefejisuzif.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbdf3e99d7936484053e343/1606284271255/graphing_quadratic_functions_puzzle_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/fomudebipefasu/brisbane_car_hire_formal.pdfIn PDF document text
    • https://s3.amazonaws.com/xelimewat/nubexuvugerenebitis.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbd0406b474932ca2689901/1606222855210/wash_by_william_faulkner_characters.pdfIn PDF document text
    • https://s3.amazonaws.com/zunaporam/bang_bang_song_video_jordan_sandhu.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5ba12df132613bbde966f/t/5fc77819c7c45a5eafa7bf73/1606907929856/89083259845.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe215e2dd96f5918b75d85/1606295903295/serokitovesevesexo.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_off0000db7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB7C 5124 bytes
SHA-256: 7d9ed065ece8d31517597d9a58a4fcf8ad22ca9ed7914c87e81f932da255cc6f
font_01_sfnt_off0000eceb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECEB 10956 bytes
SHA-256: deb3a76a4d18219ec977174f22ebecefa78cc9cfd3716275aedfee49d6dfa6f4

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