Malicious PDF — malware analysis report

Static analysis result for SHA-256 233e72932f2fd238…

MALICIOUS

PDF

83.2 KB Created: 2020-11-29 03:51:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 8220106f0a7ee60a888965024c80c502 SHA-1: 18840ba41e02eed9ad753c8e83589ba8fd0f10c3 SHA-256: 233e72932f2fd2387c4938ce9f1030dfa88f71d34e7bff040338cbde5709a34a
196 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 link farms or potentially malicious domains, suggesting a phishing or SEO scam. The ClamAV detection and ML classifier further indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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/123?utm_term=exadata+infiniband+protocol PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4468551/normal_5fb2b54c18b18.pdfIn PDF document text
    • https://xojisige.weebly.com/uploads/1/3/1/6/131637148/9a6547d68ac.pdfIn PDF document text
    • https://zifikatulonajo.weebly.com/uploads/1/3/4/4/134494345/b7e2040369f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422912/normal_5faf14f380d4d.pdfIn PDF document text
    • https://lujadogube.weebly.com/uploads/1/3/4/5/134522393/6ea6cd82799f.pdfIn PDF document text
    • https://jezulusawuse.weebly.com/uploads/1/3/4/0/134000263/874a443a.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/zinudipir/75384889864.pdfIn PDF document text
    • https://s3.amazonaws.com/ladiwuzetawedi/astm_a36_standard.pdfIn PDF document text
    • https://s3.amazonaws.com/fojaxexino/bmw_x5_2008_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/voropa/curso_robotica.pdfIn PDF document text
    • https://s3.amazonaws.com/bibejovixapis/duravukaxolosam.pdfIn PDF document text
    • https://s3.amazonaws.com/mijedusovineti/foreign_aid_definition.pdfIn PDF document text
    • https://s3.amazonaws.com/sazariwapa/english_vocabulary_worksheets_for_1st_grade.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_off0001049c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1049C 5136 bytes
SHA-256: 38cf00ecfc36188644a5779401783bb0f9f89c3a580b6b73bd5721233a77b01b
font_01_sfnt_off00011627.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11627 12360 bytes
SHA-256: 76fe5b085a83a132220d29945ed3cfdb9bed48a1d002e8937bd5ed6a7ab46f63

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