Malicious PDF — malware analysis report

Static analysis result for SHA-256 33d039f230bcc90a…

MALICIOUS

PDF

70.4 KB Created: 2021-06-08 23:25:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: be807ac4d9ef040f88d84bc810f5b49d SHA-1: 8ba258666ae14e8f49ea4e1caf1ca0fac03e018e SHA-256: 33d039f230bcc90af382b133b804219107c869c3f7a5cfa3fe049f6a37c81f10
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, many pointing to other PDFs, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no explicit script was extracted, the PDF structure and numerous external links are indicative of malicious activity.

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://wastran.ru/pbw?utm_term=app+ghd+sports PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4402720/normal_601f5c4cc456a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369190/normal_600202e0a1b93.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4505096/normal_60222300257e7.pdfIn PDF document text
    • https://waluxine.weebly.com/uploads/1/3/4/7/134759732/c90b94b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380522/normal_5fcce3ecf31dd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489844/normal_5fc6062ac5b78.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486534/normal_60046855180bf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383321/normal_5ff22bd15b3ea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379856/normal_60bd7e8e78195.pdfIn PDF document text
    • https://wetevuwerego.weebly.com/uploads/1/3/4/8/134896505/9997612.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490950/normal_5ffdaf78c76f0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368950/normal_604b00720683f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443354/normal_5fdae3cfecdbe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448535/normal_5fe1329c6fd6a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409630/normal_605dfae4c03c8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410727/normal_6059b2d05ced2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443823/normal_601601b056185.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://guronavageba.pbworks.com/w/file/fetch/144514458/tecnicas_quirurgicas_en_enfermeria_hospital_central_militar_gratis.pdfIn PDF document text
    • http://gonumutat.pbworks.com/f/filme_online_subtitrate_in_romana_2019_animate.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_off0000d7af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7AF 4968 bytes
SHA-256: 18c2b2392e055aac084f57896ee7f4aec169f49f24d2541b8fb5718944b2035d
font_01_sfnt_off0000e897.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE897 10644 bytes
SHA-256: 1ee0d4d808554fb9731a972cbc5e7d552b49157823db0b9c29ce5c4b131f3020

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