Malicious PDF — malware analysis report

Static analysis result for SHA-256 7007cdbd45e5c8e2…

MALICIOUS

PDF

65.8 KB Created: 2021-01-03 14:14:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 25a93c7138645928cb3042b8f3cc02dd SHA-1: 5825266d830c5700f5d27644f2c76ac20795a8ad SHA-256: 7007cdbd45e5c8e2d9add4f0d28416cca7e5ee801f924e4f26cb05d10a475e8b
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing campaign. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically as a phishing trojan. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards a malicious document designed to redirect users to potentially harmful sites.

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/123?utm_term=the+ultimate+gift+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4428035/normal_5fb66f7332916.pdfIn PDF document text
    • https://lizodeva.weebly.com/uploads/1/3/5/3/135342900/bewilimifumi.pdfIn PDF document text
    • https://magivuvesef.weebly.com/uploads/1/3/0/7/130775451/simaneto.pdfIn PDF document text
    • https://lidovoji.weebly.com/uploads/1/3/4/3/134313359/87d222fee859603.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380522/normal_5f97d9fd841cc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390381/normal_5f911ed07f91f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366633/normal_5fa3778132273.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8054355-9a07-400a-8a6c-95f61d297cb2/46735095482.pdfIn PDF document text
    • https://s3.amazonaws.com/pafiganovavi/zixibevefaseji.pdfIn PDF document text
    • https://s3.amazonaws.com/rutufokedizon/45595042543.pdfIn PDF document text
    • https://s3.amazonaws.com/tudawufed/60578152577.pdfIn PDF document text
    • https://s3.amazonaws.com/susopuzupure/2755406494.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e497e7a-7eaf-4b8b-a584-b829106893fa/electrochemical_cells_lab_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/kavalukato/79284898789.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_off0000c5ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5CA 5132 bytes
SHA-256: a72b0492dc665a1d57811c1403a2904fc6b0d525be361827678e57eddb1138ea
font_01_sfnt_off0000d71b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD71B 10676 bytes
SHA-256: 13b290e11d96587556ce61093e688db06559d219e23b0d745770e25b65a23bcf

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