Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f8b9bb815b5f916…

MALICIOUS

PDF

76.3 KB Created: 2021-04-25 00:20:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7be119335a77ff631766db4dca617768 SHA-1: dcc54246f5370ee62a387f1ee0ba3e3f0c8ed22e SHA-256: 3f8b9bb815b5f916522b7abc4afe04c96fb0b612d8cb799b533138041c67c830
156 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier with high confidence. It contains a large number of external links, with one prominent URL pointing to 'ponafet.ru'. The PDF structure and the presence of numerous links suggest an attempt to manipulate search engine results or direct users to malicious content, aligning with phishing or SEO spam tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://ponafet.ru/strik?utm_term=the+stranger+camus+explained
    • https://tubozabuzimez.weebly.com/uploads/1/3/4/8/134878922/fuxipurebowemeperodu.pdf
    • http://taxutipepavij.iblogger.org/common_stocks_and_uncommon_profits_summary.pdf
    • https://jazitilifa.weebly.com/uploads/1/3/1/4/131414561/d8f8f3a.pdf
    • https://bewogataxatux.weebly.com/uploads/1/3/2/6/132695278/xebakapugomekan_wupuzuxegeture.pdf
    • https://zogabimokesowu.weebly.com/uploads/1/3/6/0/136082780/waxusifafizafik.pdf
    • http://famojefefe.iblogger.org/nasitaripi.pdf
    • http://kojijeku.mygamesonline.org/23859473507.pdf
    • https://zokofefedepop.weebly.com/uploads/1/3/1/4/131437243/8832583.pdf
    • https://wifovusu.weebly.com/uploads/1/3/4/3/134312249/78becf8d0d805.pdf
    • https://dilaxizinis.weebly.com/uploads/1/3/5/9/135973905/bivujifafozunoze.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://c36efdde-2309-4ce2-a10d-b6df2ce12cd8.filesusr.com/ugd/e98059_754d45c010c64d6db6445690af805a39.pdf?index=true
    • http://riberudedanute.epizy.com/arrest_warrant_template_uk.pdf
    • https://uploads.strikinglycdn.com/files/6a6f941a-d263-4b76-90ac-8120b7b9aeea/84288597635.pdf
    • https://uploads.strikinglycdn.com/files/4047946d-6225-434e-befc-6b310f814d06/niniduwibima.pdf
    • https://uploads.strikinglycdn.com/files/829d614e-eaee-40ca-bdd3-f4df1cde1680/takezave.pdf
    • https://uploads.strikinglycdn.com/files/48f9db3c-c555-48ba-816c-2d7bb0c6ecf3/ways_to_sleep_with_a_broken_femur.pdf
    • http://bokawevetejap.atwebpages.com/pifudadoxod.pdf
    • https://4eff3ec4-d147-45d1-be73-876d9e1d0019.filesusr.com/ugd/efb3f0_94638a4207b1461d9ae5901c4829a193.pdf?index=true
    • http://zarazemudaseri.epizy.com/immunization_exemption_form_ontario_canada.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed77.bin
a4228bb092eff380675872c8bfe78cf7443ac28e0e80aaa77a9ac23d0a7c7af7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED77 5504 bytes
font_01_sfnt_off00010008.bin
5f61750468255b14b5be91511cc4e04092d0f87f3703b5102a773fa478756df9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10008 10428 bytes

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