Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8391f1f8c2bc4f3…

MALICIOUS

PDF

107.0 KB Created: 2020-12-18 03:17:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 6e10dd01a665d0654ef91dd648e4c3a3 SHA-1: d52ce5c52a38fcc41e5756b0609131df783c7a92 SHA-256: b8391f1f8c2bc4f3c1bc5b60894a7ca218950ace37c5933522cf9e0e3be91a88
184 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, specifically flagged as a phishing trojan. It contains a high number of embedded links, many pointing to disposable hosting or known redirectors, suggesting an attempt to lead users to malicious sites. The document body, though heavily obfuscated, contains text related to 'derechos de primera generacion en colombia' and the wkhtmltopdf application, likely serving as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://traffine.ru/strik?utm_term=derechos+de+primera+generacion+en+colombia In PDF document text
    • https://cdn-cms.f-static.net/uploads/4489834/normal_5fdbea9b586df.pdfIn PDF document text
    • https://ravemazezaj.weebly.com/uploads/1/3/4/8/134885195/493d408357ad2a0.pdfIn PDF document text
    • https://noduxureravit.weebly.com/uploads/1/3/4/7/134743755/rurixipelaj.pdfIn PDF document text
    • https://murusezikarif.weebly.com/uploads/1/3/4/4/134436274/7496102.pdfIn PDF document text
    • https://lotagixowila.weebly.com/uploads/1/3/1/1/131164100/xelanenemobumukemo.pdfIn PDF document text
    • https://joletumutete.weebly.com/uploads/1/3/4/8/134871701/999950072.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/5fc4d7f711f6a419849ef1c8/t/5fc77209bfb90028be525bde/1606906378323/92422132912.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbffe9d5687f52b6b7c161f/t/5fc19dbf2dd96f59182c1b2f/1606524352574/the_modern_gentleman_body_wash.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbd1db6634219316b32adb2/1606229430980/lifuli.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc37eeb104edf1d779169b0/t/5fc4fff03570fb44d1a040ca/1606746097613/21681002243.pdfIn PDF document text
    • https://s3.amazonaws.com/dusubonifu/lidijepararamisaka.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_off00016652.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16652 5624 bytes
SHA-256: 5a2aa68eba46b7a24c5ec666957aa5d25a77438ee59408b34645e7fdcbcdb6a1
font_01_sfnt_off00017943.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17943 11552 bytes
SHA-256: 67ba44e95a0f3556a661ade4b94b437ad0c8f2a54b110b09f208adb0a36c3e42

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