Malicious PDF — malware analysis report

Static analysis result for SHA-256 b59866e2c97ac454…

MALICIOUS

PDF

66.4 KB Created: 2020-12-09 00:53:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 4d5ada37be493ebc32c941cb3ee4bc3c SHA-1: 1769c95af21b99cbf95eef2874a7350bcf93deac SHA-256: b59866e2c97ac454763026587df739ae0d825f21d4f4fe9424b6f41eaa174ba1
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs pointing to link farms hosted on disposable domains, with one specifically identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the heuristic firings suggest the PDF's primary function is to lure users to malicious infrastructure.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://gettraff.ru/strik?utm_term=night+mother+pdf In PDF document text
    • https://pepotoxuxomupav.weebly.com/uploads/1/3/1/4/131483830/62ef76e1176b55d.pdfIn PDF document text
    • https://dujezipiver.weebly.com/uploads/1/3/4/6/134610991/6482502.pdfIn PDF document text
    • https://guboriratuji.weebly.com/uploads/1/3/4/2/134235556/xigaxota-nisanejajaj-tevofaneka-gabepebuli.pdfIn PDF document text
    • https://rurikuzusobow.weebly.com/uploads/1/3/4/8/134879219/lepasiweje.pdfIn PDF document text
    • https://gabejopow.weebly.com/uploads/1/3/4/5/134597712/2972849.pdfIn PDF document text
    • https://zuwuwuxi.weebly.com/uploads/1/3/4/8/134883554/8e444e966.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/5fbf681c3c6ccf69f356b0f4/1606379551656/7708717062.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3bf9fa34-c4c7-45ad-8e2d-3489711b9248/batenemesuw.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc2cb63bf71053ccb1c5e2b/t/5fcd92e4cded405bb8f24c4f/1607308005287/classic_helicopter_corp_auburn.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbd2c53660d3b5ffdb59922/1606233172800/90639427568.pdfIn PDF document text
    • https://s3.amazonaws.com/viromibukoleliw/nejor.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_off0000c9ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9AB 5004 bytes
SHA-256: ff405f08a3a256d4fdedbab1067bd0054ef060b9a7c22c7bc57393047d380183
font_01_sfnt_off0000da91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA91 10164 bytes
SHA-256: dfa0cf87d9744027206a345b150c3092551dbd185a9a57415acb2fc2d76442a2

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