Malicious PDF — malware analysis report

Static analysis result for SHA-256 d16e4d83def6c8a9…

MALICIOUS

PDF

74.4 KB Created: 2020-12-24 00:51:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: f47708664baffa7a6fe728a7fc4157e1 SHA-1: d01d4d2b75d8f536399b44194d53762076542dc0 SHA-256: d16e4d83def6c8a9cbf0bfc4cd212252d432de87cf907412dafcba5a3bf3e400
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, with heuristics indicating it contains a mass external link farm. The embedded URLs, such as 'https://trafffi.ru/aws?utm_term=laravel+email+verification+template', suggest a phishing or content-luring attack. Although no scripts were explicitly extracted, the PDF structure and external links are indicative of 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://trafffi.ru/aws?utm_term=laravel+email+verification+template PDF link annotation
    • https://xujopikaxatanow.weebly.com/uploads/1/3/4/8/134850499/9ac1c5.pdfIn PDF document text
    • https://vefekigut.weebly.com/uploads/1/3/4/3/134391246/pagaf-xigezoliwuloxeg.pdfIn PDF document text
    • https://cdn.sqhk.co/likafupat/igibgiP/82127193251.pdfIn PDF document text
    • https://nikoxutaju.weebly.com/uploads/1/3/1/3/131378952/dazemobadititit.pdfIn PDF document text
    • https://cdn.sqhk.co/purovufizu/UjNjbXt/newegg_return_policy_cpu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/bidemewufa/chemical_properties_of_alkenes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28cfc1fe-88c3-4ef6-9c84-212f4ec797f5/rewevilokujalaroketevo.pdfIn PDF document text
    • https://s3.amazonaws.com/sasufufa/fiwisevomojulorokerigalew.pdfIn PDF document text
    • https://s3.amazonaws.com/zazelujeju/88494572692.pdfIn PDF document text
    • https://s3.amazonaws.com/memul/50585051042.pdfIn PDF document text
    • https://s3.amazonaws.com/faxaxos/5176908240.pdfIn PDF document text
    • https://s3.amazonaws.com/xijuxosisomuna/vunakamavorotokajesovum.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d730.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD730 4772 bytes
SHA-256: 660cd37c57c1246f5f33b36d1946556a8bc21ba8d57ea6cbd536c29b56fd449d
font_01_sfnt_off0000e74e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE74E 11556 bytes
SHA-256: 1138c7376ceb1ffcd6bae277de09e527af0be057a9b5fd735552e07d873f39ad
font_02_sfnt_off00010ee2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EE2 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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