Malicious PDF — malware analysis report

Static analysis result for SHA-256 37935bcf6f2a9e09…

MALICIOUS

PDF

58.0 KB Created: 2020-12-20 14:55:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1951d99a1035bffdd1dd8e8404c5fd03 SHA-1: 59b1f04d41cb82845cd6411baa437bd89e519131 SHA-256: 37935bcf6f2a9e0902bae9fbe92894f906f642c984acb8e66e9bb7d0f8514740
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, suggesting a malicious intent to redirect users to potentially harmful websites. The ClamAV detection and ML classifier further support its malicious nature. While no scripts were explicitly extracted, the PDF structure and embedded URIs indicate it's designed to facilitate access to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffking.ru/strik?utm_term=side+by+side+plus+1+pdf
    • https://zanasebumafuwaj.weebly.com/uploads/1/3/4/8/134899829/rovog-rukutider-wubesamiwidit-joxovaw.pdf
    • https://rurusoweloxefug.weebly.com/uploads/1/3/3/9/133989150/sabirug.pdf
    • https://fategebedabeno.weebly.com/uploads/1/3/4/7/134718848/3c840056.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/e45ea2cd-a3ea-4a4c-9a06-b241563946e2/rivokidexuzegirabipede.pdf
    • https://s3.amazonaws.com/ratixifo/zawipokedemom.pdf
    • https://s3.amazonaws.com/fojaxexino/angular_4_formarray_validation.pdf
    • https://s3.amazonaws.com/jifesu/autocad_house_plan_and_elevation_free.pdf
    • https://s3.amazonaws.com/wozowuledij/free_monthly_spreadsheet_for_bills.pdf
    • https://static1.squarespace.com/static/5fdc7d305fcdb718a17c69c1/t/5fdcd5aa42e81c390ad4552e/1608308140120/guidelines_rainwater_catchment_systems_hawaii.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ac42.bin
5146505afcb229770b65d16aa17600dab9043e6bb557043364c15846bc72f9f9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAC42 5128 bytes
font_01_sfnt_off0000bdd2.bin
2bf34a04ef89f8eecc7049e5e0d48410265c753eac6f8acec3a6c0a075dd4e0e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBDD2 8784 bytes

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