Malicious PDF — malware analysis report

Static analysis result for SHA-256 29d265b415616b28…

MALICIOUS

PDF

152.6 KB Created: 2020-11-17 08:20:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: c9270be9da8f4e6967c21a015c2704f9 SHA-1: e6222c68bbf96a5c42f2ba8a4e32c3fd30618ff4 SHA-256: 29d265b415616b2895fa41ab8ffbc129bb2cda562892d636377eb4f69610e891
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating it is likely a phishing or trojan delivery mechanism. It contains a link farm with multiple disposable domains and a primary malicious URL, suggesting an attempt to redirect users to a compromised site. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 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/strik?utm_term=principal+parts+of+manual+typewriter PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4479674/normal_5faeff178f675.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369507/normal_5f992413b65f8.pdfIn PDF document text
    • https://ritobawen.weebly.com/uploads/1/3/4/4/134486043/wepoju_zavevo.pdfIn PDF document text
    • https://parukiwodisurup.weebly.com/uploads/1/3/4/4/134455528/puzafaje.pdfIn PDF document text
    • https://vuxozajuje.weebly.com/uploads/1/3/1/3/131379873/bamudepekepa_setumazowido.pdfIn PDF document text
    • https://dudikojegak.weebly.com/uploads/1/3/1/4/131406444/6119524.pdfIn PDF document text
    • https://bipikive.weebly.com/uploads/1/3/4/3/134342269/xemabelerurezutip.pdfIn PDF document text
    • https://gimejexoxixaza.weebly.com/uploads/1/3/1/8/131872185/nesubine.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/dozuga/25163713800.pdfIn PDF document text
    • https://s3.amazonaws.com/memul/international_airports_in_india_2018.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001ff75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FF75 5356 bytes
SHA-256: 639750665523ee54a24af8e525d7bd4e308b2d2c91f230bb2c79071ab4e4e723
font_01_sfnt_off000211a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x211A8 15880 bytes
SHA-256: 5321469545296d8165b194877ff9947cfa7f5058440aa50d0c2e6e1ff60e8137
font_02_sfnt_off00024014.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24014 16116 bytes
SHA-256: 6fffb1aeb89666cbcaec4ce24454e19e9ad5757041bd2745d7057949fb60916b

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