Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5bf9b941ad93b10…

MALICIOUS

PDF

91.0 KB Created: 2021-01-06 08:33:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 3d67a28cd0282059231eccecf9fc26d8 SHA-1: 77b38249358584e15a7aa271045c77506f0bd340 SHA-256: d5bf9b941ad93b105aa780f683590e18473dd476e0ed90d052251c1db70e0c7c
126 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 as malicious. It contains an embedded URI pointing to 'traffset.ru', which is associated with link farming and disposable hosting, suggesting a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and heuristics indicate it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://traffset.ru/aws?utm_term=ffxi+enfeebling+magic+skill+up+guide PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4413375/normal_5fc756072fdd6.pdfIn PDF document text
    • https://sutukedepebovi.weebly.com/uploads/1/3/4/7/134753024/zoxuluzezoga.pdfIn PDF document text
    • https://xesapidad.weebly.com/uploads/1/3/4/3/134346602/rakuwubebifipe.pdfIn PDF document text
    • https://pamuvomamutafa.weebly.com/uploads/1/3/4/3/134305197/sovafafodumo.pdfIn PDF document text
    • https://ledatomonuv.weebly.com/uploads/1/3/4/6/134686063/999664.pdfIn PDF document text
    • https://cdn.sqhk.co/lagitesavap/ha3hjBA/chess_engine_free_download_for_android.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427095/normal_5fa8988fc3866.pdfIn PDF document text
    • https://jipuzalo.weebly.com/uploads/1/3/4/6/134693454/307576.pdfIn PDF document text
    • https://cdn.sqhk.co/sezunofubuzi/hdgebDT/11775101204.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/be091eb4-909e-4e0a-9269-11f13bb381d0/51583615942.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6f76640-8138-4037-bff1-ff636002edbb/31264632690.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1269eb83-1f61-48e6-b8b9-190c4b76c6c3/90520014020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9358242-7c3f-4bba-a821-1d0fbfe8949e/the_splendor_of_the_king_instrumental.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/142f98a1-cf4e-478d-9440-f2f8eb4d92e7/6347731350.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010caf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CAF 5608 bytes
SHA-256: 18782da2b2bf687301074ddcaad38dc70f0fe572b37a597cd90db0844ad8cd3a
font_01_sfnt_off00011fc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FC9 11156 bytes
SHA-256: 6138e7e443decf0d025155c2156bd089650a760c894d53abc1281db7966a2386
font_02_sfnt_off00014649.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14649 16952 bytes
SHA-256: 69256f941e37eec7d618aacf86f615defa944e43489b53b82ed6f3fe0f1dc537

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