Malicious PDF — malware analysis report

Static analysis result for SHA-256 83913b5e37835cfa…

MALICIOUS

PDF

68.5 KB Created: 2020-11-22 03:15:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: d2d3b43067eb8ac5e46c1f021a390737 SHA-1: c921a20a5214027f8b73d9739ce56d9b73351463 SHA-256: 83913b5e37835cfae5a12a709b3388825ce69db64695fe752502347e3fdb0da3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF file was identified as malicious by multiple heuristics, including ClamAV and an ML classifier, indicating it is likely a phishing or trojan distribution attempt. The PDF contains a link farm with numerous external URLs, suggesting an attempt to manipulate search engine rankings or redirect users to malicious sites. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attack pattern involving redirection and potential exploitation.

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
  • 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://traffnew.ru/123?utm_term=dublin+parks+and+recreation+guide PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4379379/normal_5fb74f4eedf74.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387232/normal_5fae84c988eac.pdfIn PDF document text
    • https://toxoladosa.weebly.com/uploads/1/3/4/4/134479392/3634250.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469617/normal_5fb84892a491f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421471/normal_5fa8febdb092f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456998/normal_5fa73b76202cc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377679/normal_5fa3e2aa8c637.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/naramuro/kirk_family_history.pdfIn PDF document text
    • https://s3.amazonaws.com/kavalukato/second_hand_sheet_metal_cutting_machine.pdfIn PDF document text
    • https://s3.amazonaws.com/vovabagubajegeb/cummins_isx_service_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/01135d5c-9512-4d48-b952-046ab32d717f/rekiweku.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e63acd8c-0d38-4927-b04c-c8f8883b36cc/nolibafilutamesemopi.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_off0000ce2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE2D 5444 bytes
SHA-256: eec5af445e721bf74d5415715ea6c28924f99f60be4afcb96f463ac9efcffaea
font_01_sfnt_off0000e0bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0BB 10668 bytes
SHA-256: d51b05c444bcb554ec99c1faa941abd2f6e66cb08109211b5cf27adbc8445a25

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