Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2f8bc2455822fd0…

MALICIOUS

PDF

88.7 KB Created: 2021-01-16 00:32:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 9f5f217c8175f0d4806235bae84a82bf SHA-1: 1244ba1d17220df3aba756c9a433f24b503004f1 SHA-256: b2f8bc2455822fd055aa6339647de3d1a37748a48c6d1f3a88a7e0f9227a5c05
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool sometimes used to create malicious PDFs.

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 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.
  • 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/123?utm_term=glock+18c+airsoft+review In PDF document text
    • https://site-1176931.mozfiles.com/files/1176931/foluzizelova.pdfIn PDF document text
    • https://site-1175201.mozfiles.com/files/1175201/game_avatar_logo_apk.pdfIn PDF document text
    • https://firudofomupavu.weebly.com/uploads/1/3/1/3/131384713/madiruv.pdfIn PDF document text
    • https://site-1177423.mozfiles.com/files/1177423/81904738021.pdfIn PDF document text
    • https://wikoriduban.weebly.com/uploads/1/3/4/3/134341401/bbef35d.pdfIn PDF document text
    • https://cdn.sqhk.co/pugalaleluti/X3iigUz/1010_block_fun_cash_out.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/rodigapigeta/39918617088.pdfIn PDF document text
    • https://s3.amazonaws.com/kewakuko/guwanalesuxa.pdfIn PDF document text
    • https://s3.amazonaws.com/dozore/canada_embassy_addis_ababa_visa_application_form.pdfIn PDF document text
    • https://s3.amazonaws.com/pipaneku/bully_game_android_1.pdfIn PDF document text
    • https://s3.amazonaws.com/kovilowab/ruzorosidatadule.pdfIn PDF document text
    • https://s3.amazonaws.com/gadumagabusodel/pubegin.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00012d3d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x12D3D 24076 bytes
SHA-256: 990e1ee93cbc458a780f0d1de11ee328a57fafb6caf158687cac5562704b09ac
font_00_sfnt_off0000f29f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF29F 5368 bytes
SHA-256: a179ee0d378a7a5c1992d7aef4d5f390d80a52a6b6dfa1f01768542418ddfe60
font_01_sfnt_off00010519.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10519 11668 bytes
SHA-256: 9571774829d6ae9f52e720e75dc2f168310c90ba44666e1becb4e83009643460

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