Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c0252a7cbaebee4…

MALICIOUS

PDF

72.9 KB Created: 2021-01-02 17:10:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 4885605d12781ef54fb0964d9d256f58 SHA-1: 70d4af992610452b5ba8270cffeba3d9654dcfdd SHA-256: 3c0252a7cbaebee4e4a513e4dadcd80d9d3f0e3026cc5da8335dd51c708ced75
96 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, with a high risk score. It contains an embedded URL pointing to 'trafffi.ru' which is associated with a Twitch password recovery lure. While no scripts were explicitly extracted, the PDF structure and embedded URI heuristic suggest an attempt to redirect users to a potentially malicious site for credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://trafffi.ru/123?utm_term=twitch+forgot+password+and+username PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4485296/normal_5fcda171d7138.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414515/normal_5fec550ae0c56.pdfIn PDF document text
    • https://cdn.sqhk.co/fakomuse/ibzSheE/republique_game_wiki.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420037/normal_5fa7a64bc366d.pdfIn PDF document text
    • https://cdn.sqhk.co/vamunidibu/Eih5ifP/ultimate_photo_blender_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/perigupa/gjhe1Qv/wokejewiwoxufezirosoz.pdfIn PDF document text
    • https://cdn.sqhk.co/riwutosax/gWjgIfN/sumodesuwexupalefikamo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427506/normal_5fa46c8a3edb4.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/bitajemisajoz/html_css_js_formatter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a91ee107-8255-4be5-b4b0-686ab2b43dd8/85964828947.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/837f86d0-af84-491f-9125-ffd98e0834dd/mass_percent_composition_of_sulfur_in_al2so43.pdfIn PDF document text
    • https://s3.amazonaws.com/sajatesawodiji/kemeneludipebuvotizefowur.pdfIn PDF document text
    • https://s3.amazonaws.com/napisakaluja/jefuwofenojumejaguf.pdfIn PDF document text
    • https://s3.amazonaws.com/satudifin/30630531916.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6817d51c-f3a0-460e-a12b-39aa7db95d6c/13._blank_verse_is_always.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ddbd731a-48fd-4010-8d61-e06e895f1286/momivub.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_off0000dbc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBC2 5576 bytes
SHA-256: 29d7674ceec1fa120408d1af975874c2a9f1d98b46f65b43a7dbf46262a694bc
font_01_sfnt_off0000eea9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA9 12524 bytes
SHA-256: 579e70e052cc86734dde729e85b5b5183dc8bbd217db3454c3ab0cf41d97dc84

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