Malicious PDF — malware analysis report

Static analysis result for SHA-256 67e9b26b921bbaaa…

MALICIOUS

PDF

76.1 KB Created: 2021-03-09 09:39:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: d88109f055ed014d89f4322149bbfd82 SHA-1: de2dbd87d210d90680784aa4749326862e441c2a SHA-256: 67e9b26b921bbaaab7bdf6ee71bfa470c445ceda7504937e0fb41a6c408eb44c
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, with one prominent URL pointing to 'nipisod.ru' and a search query for 'pixel car racer cheats android'. Heuristics indicate the PDF is a link farm on disposable hosting, and ML classifiers and ClamAV strongly flag it as malicious, specifically as a phishing trojan. The presence of embedded URLs and the nature of the content suggest an attempt to redirect users to malicious sites for phishing or malware distribution.

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://nipisod.ru/wix?keyword=pixel+car+racer+cheats+android PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4419847/normal_600f1ffc6f56f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412758/normal_60464173d60d8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485809/normal_6026b05abe393.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383912/normal_6012a518732c6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380219/normal_6026776510979.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378604/normal_5fcac09639662.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472506/normal_5fde05011d5d2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380543/normal_5fd2876a610a2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411932/normal_600265b2231f0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://0c2a7d7b-be9d-4ef2-a94c-09ca905cc17d.filesusr.com/ugd/7d21c0_1a75c752b301458baae80fa5b7838ae5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fad2abed-823a-4ad9-ba93-934e81d193f9/hp_envy_4502_error_printing.pdfIn PDF document text
    • https://e0f910ba-f4aa-4d6b-87f6-24d78cda99ab.filesusr.com/ugd/cc15ef_2721ae6d0e834c36a9b56ee023147940.pdf?index=trueIn PDF document text
    • https://77483064-5892-4b52-b419-66e751946b77.filesusr.com/ugd/ef7b09_9657762acca3408ab7a9da95b198d71b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2658755-ef06-41bc-ab2e-399ca9c718e5/fubuwik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eff35654-e2c4-4243-8f32-e2ae683bb8a0/51280553685.pdfIn PDF document text
    • https://b42dfab6-8227-42c4-8fe5-fc04d9433513.filesusr.com/ugd/a9a8df_460304e7257e48cbbc425134dcc71698.pdf?index=trueIn PDF document text
    • https://f4b9ed98-44c1-44e6-9966-d9817cd43de7.filesusr.com/ugd/9ced5d_9d9e3c8900104989917442852f957bad.pdf?index=trueIn PDF document text
    • https://814cba0f-f649-4223-bfe6-7884e6e02b9d.filesusr.com/ugd/c1108c_48add3bda6814ff1930fb947272c0613.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9efaab41-7d27-48db-afb8-c2c9a5dc54f9/spanning_tree_protocol_tutorial_ppt.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_off0000eed0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED0 5096 bytes
SHA-256: 168ff00b1aa24b56edd3a2f5e0dbf5ec764a0b43163ffee07bd339881c4f8919
font_01_sfnt_off0001001d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1001D 10288 bytes
SHA-256: 0603578f4b8ea11564602f82612051d114dc4f618cf6908d4c16d5a2d743f71f

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