Malicious PDF — malware analysis report

Static analysis result for SHA-256 a523133ccf0d140d…

MALICIOUS

PDF

72.0 KB Created: 2021-01-17 12:49:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 5c72ca76438b3673f2518ed62ac1060e SHA-1: b4469c50c51bef5a734a8e4f642e69dcb86df11b SHA-256: a523133ccf0d140d3aef54de201f827e0d54118f524f477be40b09f3ab834f30
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDFs, suggesting a link farm or a method to distribute further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URLs are indicative of a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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://trafficel.ru/aws?utm_term=2d+shapes+edges+and+vertices+worksheet PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369508/normal_5faa8129d3d39.pdfIn PDF document text
    • https://cdn.sqhk.co/litonesi/jj37ihR/can_you_escape_50_rooms_11_level_37.pdfIn PDF document text
    • https://cdn.sqhk.co/rubekafux/biagejg/soxazaxelim.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459062/normal_5ffca47abc76d.pdfIn PDF document text
    • https://devudupaf.weebly.com/uploads/1/3/4/8/134880603/rujeluper_pagebukit_xalolilovuzudel.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494160/normal_5fb4226b63037.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414491/normal_5f9cd18ec6791.pdfIn PDF document text
    • https://cdn.sqhk.co/dobexesi/iig6Ujc/rockauto_jeep_accessories.pdfIn PDF document text
    • https://site-1172039.mozfiles.com/files/1172039/wifotaligerodeja.pdfIn PDF document text
    • https://cdn.sqhk.co/difigobon/3gdy7DV/garoma.pdfIn PDF document text
    • https://cdn.sqhk.co/nomazotesi/jgifWD6/dominos_delivery_jobs_in_delhi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475995/normal_5fabb177ebf3d.pdfIn PDF document text
    • https://cdn.sqhk.co/betewulo/ja9rsF6/vimojedinaponebevafuvisi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377371/normal_5f89c52859499.pdfIn PDF document text
    • https://cdn.sqhk.co/molewekane/jgjhsLL/12383978917.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000dbdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBDB 5556 bytes
SHA-256: 0d4a0a12871b95efd7620f4bb0c76f95a8fe6fa2bd0bb0543e2fbe099aee1272
font_01_sfnt_off0000eed5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED5 10476 bytes
SHA-256: e46a381a087f61a2a083484274c1908f07e6acabdb79cee2c4b1622b01acac57

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