Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bf5c8acbbed6b9b…

MALICIOUS

PDF

60.1 KB Created: 2020-12-07 02:06:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: ba4b228af4b16c1569c04c57d147c397 SHA-1: 15bd2abda756bc211e0a9c25353bdf9bcee95a68 SHA-256: 4bf5c8acbbed6b9bb9ecee3aaa1fa827d9fab8ed55a2848935d90c203954b010
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, a common tactic for phishing or distributing further malware. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to malicious sites, potentially for credential harvesting or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://trafficel.ru/strik?utm_term=arctostaphylos+densiflora+%2527emerald+carpet%2527 PDF link annotation
    • https://kifobanirijo.weebly.com/uploads/1/3/4/5/134595275/letiruxokulebiket.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367950/normal_5f8aa1d63b225.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499629/normal_5fcc157129b09.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/gadumagabusodel/takivadutupukoxowunize.pdfIn PDF document text
    • https://s3.amazonaws.com/petikamov/99573058033.pdfIn PDF document text
    • https://s3.amazonaws.com/zarelusipofox/partner_enablement_plan_template.pdfIn PDF document text
    • https://s3.amazonaws.com/potamotaz/langlois_weigand_associates_inc._courses.pdfIn PDF document text
    • https://s3.amazonaws.com/fidefofudi/beginner_python_programming.pdfIn PDF document text
    • https://s3.amazonaws.com/norozovijalu/forasuzo.pdfIn PDF document text
    • https://s3.amazonaws.com/voropa/11769374818.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_off0000afb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFB4 5520 bytes
SHA-256: 81b414bfdb4fce43229b3f48bd6b43b5ca707ce7a2056189902a7e7d3699dd58
font_01_sfnt_off0000c265.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC265 9840 bytes
SHA-256: c2103af650a9082ce4e5495d7d85c4468aaf212ce3750c0d0717df8db044a2f2

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