Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf3a6bed398983de…

MALICIOUS

PDF

65.6 KB Created: 2020-11-11 02:16:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: aacc3273d7b04a80ac4ef91d57bd3978 SHA-1: bbe792db32023260e604139eb60feb8b5e651faa SHA-256: bf3a6bed398983de260001127ad5dc91435f0db84f96674987936901bf5b730a
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous external links, including a suspicious URL 'https://trafffe.ru/123?keyword=knights+and+kings', which is likely part of a link farm or phishing campaign. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create PDF documents from web content, further supporting the idea of a web-based lure.

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://trafffe.ru/123?keyword=knights+and+kings PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4406216/normal_5fa0f75c91186.pdfIn PDF document text
    • https://xedutogozazinar.weebly.com/uploads/1/3/4/5/134505586/kotojen.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413226/normal_5f9a4113f24f8.pdfIn PDF document text
    • https://lalidusuferub.weebly.com/uploads/1/3/4/4/134440540/pimatumosujafenive.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae399ec9-dc18-4870-9702-9fdab8aa25e8/71841720375.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60bad12d-1051-4eb5-a3d5-68ce5c8fb68a/abc_songs_for_starbound.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18ab993c-bbda-4f84-b5d3-85e0ba3931d0/ridegivewamifo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5fd8b3e1-d936-4eeb-9c5b-0383f84fec0c/wumuv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/caadd006-d45e-4ac9-a69c-51077bbc9bbc/call_of_duty_zombies_story_summary.pdfIn PDF document text
    • https://s3.amazonaws.com/zugutixe/iphone_11_giveaway.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68635400-dca3-404a-a01e-3fc6cc3300d3/owner_operator_spreadsheet_ooida.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb701aea-306d-4a8f-b3dc-673622bfa12b/81582073416.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63edaff5-349e-4e9d-8b3a-8591f9dfd219/30292197153.pdfIn PDF document text
    • https://s3.amazonaws.com/polojuliragam/zapiga.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_off0000c7cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7CB 4992 bytes
SHA-256: 7695ae177e3b9497e377f4c6a657eb392dbf343f4b8fc68c8a3291235633f2c0
font_01_sfnt_off0000d8c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8C9 9772 bytes
SHA-256: 1d68a5852c37e2232cf62e405a82d215e2027d5ac07181b1b888f10d3f960ccb

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