Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef0a33e7dc19cb3b…

MALICIOUS

PDF

68.0 KB Created: 2020-12-16 17:55:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: be4527f1ebeb396a435ef87ecedffa7d SHA-1: 73899802990d0a6941cba3cf5bdb5e8a0c40798f SHA-256: ef0a33e7dc19cb3bfa20edbf59b178de82c6edb2a6c308ccb1a1856021b9da35
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 are to benign-looking PDF files, but one key URL, https://traffset.ru/strik?utm_term=montana+tractor+parts+list, is flagged as suspicious. The heuristic PDF_SEO_LINK_FARM indicates a large number of external links, suggesting a link farm used for SEO manipulation or to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via the suspicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • 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://traffset.ru/strik?utm_term=montana+tractor+parts+list PDF link annotation
    • https://josuriwomevopi.weebly.com/uploads/1/3/4/7/134769094/9564879.pdfIn PDF document text
    • https://kokubexajaluk.weebly.com/uploads/1/3/2/6/132681668/gemam.pdfIn PDF document text
    • https://nukevokisoget.weebly.com/uploads/1/3/2/7/132711970/difoduwebuvim.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/5fc783dec43b1711988afe4b/t/5fd5f9d03ebe0416315512fa/1607858641475/acdsee_2019_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/431e2b63-b880-4822-b48f-2f1c5ded74d4/fopomubebejolobokav.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc29c05a3bf4b14abb4035c/t/5fcfbe966712b76818b3adab/1607450265413/ritexixubo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0bae27aa-3598-41a1-85d1-9103906ed9eb/gokadisuze.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e41fb78-4e97-440f-8525-ecbdca6f3924/naludofafa.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe0c2d6457125654016f86/1606290480727/34715283247.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc38dcd0b6b03258f461b74/t/5fc4caece6d49a06bb296e03/1606732524783/privilege_power_and_difference_free.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_off0000cf01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF01 4932 bytes
SHA-256: ba9e1c0e5ceebaa6129169ec8f9ec2d88c2c53bc183398a1b0824b18f034a8fe
font_01_sfnt_off0000dfe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE4 10968 bytes
SHA-256: be4feffd3fb3fd40ddd305495fe0733df5fe9730d6bb7a1a7da6d2a1f8d736d1

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