Malicious PDF — malware analysis report

Static analysis result for SHA-256 6266ab6fd65a2b11…

MALICIOUS

PDF

67.3 KB Created: 2020-12-23 10:46:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: fda218602360e329ec015802a4dd15c4 SHA-1: b8f20cd5ab856318b111849fa8be03ca2f8b4243 SHA-256: 6266ab6fd65a2b1129d42808501e0a0f75536027e4c3d89472a4348339923a21
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one particularly suspicious URL pointing to 'trafffe.ru'. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is part of a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. ClamAV also detected this file as 'Pdf.Phishing.Trojan'. The document body is heavily obfuscated and unreadable, but the presence of URLs and the heuristic firings strongly suggest malicious intent.

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 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://trafffe.ru/strik?utm_term=survival+city+zombie+base+build+and+defend PDF link annotation
    • https://lujigoget.weebly.com/uploads/1/3/4/4/134482608/juvopavusunamos_kufevog_watidar_lizavarib.pdfIn PDF document text
    • https://tadonajates.weebly.com/uploads/1/3/4/3/134319020/bufukozenabe.pdfIn PDF document text
    • https://tewazaxapij.weebly.com/uploads/1/3/4/8/134873756/2938697.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376875/normal_5fc2a28417c0d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366402/normal_5f87c482d8088.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381541/normal_5fd7a4a2202c0.pdfIn PDF document text
    • https://valazasabo.weebly.com/uploads/1/3/1/3/131398294/5857288.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/262b92c6-b149-4de2-aac6-1677c244c681/suvewowekunutu.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbdee2d7acac6192a8548e8/1606282802843/sakowulomarutowegulizib.pdfIn PDF document text
    • https://s3.amazonaws.com/limepusotanal/mizixiwoxibegorewid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59b19e27-0d44-4d75-8fb5-845e75e680c9/74395868526.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2af903a1-1e15-4557-9a29-6b572205e34e/wuzodurugetatekegofa.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0d70dc14dfd36fef128e0/t/5fc14cec7acac6192af0de83/1606503661611/ibuprofen_and_tramadol_at_the_same_time.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b0ca756-6cb6-4821-abde-dd1b62dd44b1/freemyapps_hack_apk.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_off0000bb73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB73 3316 bytes
SHA-256: e6f17e86a218c5303da7f01ad71c6d9a1b5e17c9d4d4e72c91a7ce53081c2121
font_01_sfnt_off0000c749.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC749 5624 bytes
SHA-256: b574bdf22c1f5a5ec271ed436bf0e00507452bf4306a39d769b64c5c352f4e3c
font_02_sfnt_off0000da65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA65 11012 bytes
SHA-256: c50a3df6f9bbab654da0f1902562bafb98e26feca33f706a8219252f02164496

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