Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebc437283cf5a9e5…

MALICIOUS

PDF

73.3 KB Created: 2020-12-01 08:50:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 31390e23073d6ac8ce3d026fba1fad19 SHA-1: 86cceee401443f4f5ed951b5c09737641701cbbe SHA-256: ebc437283cf5a9e5f67b970f994ff30b7b7bc325ae7390cd55b6c4faf0e79222
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics, including ClamAV and an ML classifier. It functions as a link farm, directing users to numerous external URLs, many hosted on disposable domains. The document body contains obfuscated text and a URL pointing to trafftec.ru, suggesting a phishing or scam attempt. The presence of PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a deliberate effort to create a network of redirecting links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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.
  • 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://trafftec.ru/123?utm_term=settlor+of+trust+uk PDF link annotation
    • https://metubunotawe.weebly.com/uploads/1/3/4/5/134595280/kuletinig-wovopebu-vimup-benifoxunukadal.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406466/normal_5fad4720441ab.pdfIn PDF document text
    • https://jasevumoxemu.weebly.com/uploads/1/3/4/7/134707335/naratofujug.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414341/normal_5f9c73f8f2c9d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465392/normal_5fc27008d25a5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369903/normal_5f8a4d465adcc.pdfIn PDF document text
    • https://duxataravur.weebly.com/uploads/1/3/4/0/134017775/1d2ad3de2762.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413462/normal_5fa93a22571c3.pdfIn PDF document text
    • https://magogojelut.weebly.com/uploads/1/3/4/8/134859832/bdec57b.pdfIn PDF document text
    • https://joxufomuvonabu.weebly.com/uploads/1/3/4/4/134474754/nebov.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458163/normal_5fa54c1ca0f26.pdfIn PDF document text
    • https://kuvinonufero.weebly.com/uploads/1/3/4/3/134307364/7722855.pdfIn PDF document text
    • https://kupanonul.weebly.com/uploads/1/3/4/6/134682697/beduvebu.pdfIn PDF document text
    • https://tijabitosivu.weebly.com/uploads/1/3/4/3/134396728/9702483.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/5fbf4cf2f8cdb769c6d9162e/1606372595221/reading_a_climate_map_worksheet.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_off0000e449.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE449 4716 bytes
SHA-256: 83cfc498327428e611c1566a61a9058b1a6855b420d9fabb878d49288d588856
font_01_sfnt_off0000f464.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF464 10632 bytes
SHA-256: a59326eda6fab1b8c5be14bdd2a4f70b6dfb1f031c0cedc2577154ab0bb8bc14

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