Malicious PDF — malware analysis report

Static analysis result for SHA-256 9edb25eb6cadea16…

MALICIOUS

PDF

81.3 KB Created: 2021-03-12 07:55:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b5c419d63f4969ed9513c45c053b5bc5 SHA-1: d55456d92b8b83061109c1db2515386cd877596b SHA-256: 9edb25eb6cadea1673f53b27516acf2e7a036283bc7a41429132ad025c093cf0
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, with a critical heuristic identifying a large number of external links, suggesting a link farm or redirection mechanism. The primary external URI points to 'jumiwimov.ru', which is likely a malicious domain used for distributing malware or phishing content. ClamAV detection and ML classification further support its malicious nature, indicating it's a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://jumiwimov.ru/wix?keyword=guide+me+o+thou+great+redeemer+lyrics
    • https://static.s123-cdn-static.com/uploads/4499334/normal_5ffeee8cbbd9d.pdf
    • https://cdn.sqhk.co/wanadujogo/Sgdk0Ia/jedamilafiw.pdf
    • https://cdn.sqhk.co/poxofufiko/bFwPpjf/bokeferagagozajomevun.pdf
    • https://cdn.sqhk.co/mirofifuba/mK6Diap/exiled_kingdoms_leveling_guide.pdf
    • https://cdn-cms.f-static.net/uploads/4530712/normal_5fe8e4205522d.pdf
    • https://static.s123-cdn-static.com/uploads/4386076/normal_5feb58f99ce93.pdf
    • https://cdn.sqhk.co/tarozawowe/giepsig/ta_express_white_hills_az.pdf
    • https://cdn.sqhk.co/tuxisilogok/hsjjufe/ship_games_simulator_pro_2.pdf
    • https://cdn-cms.f-static.net/uploads/4378405/normal_60416335c9361.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/gagagakigibapo/rajudigarawu.pdf
    • https://s3.amazonaws.com/radubozufiwo/nodobagunor.pdf
    • https://e86c6366-0652-46cb-9e1f-5633a133dba9.filesusr.com/ugd/510a18_476e575615824ec3b896b939c4ea5972.pdf?index=true
    • https://27dd58ca-3bab-4825-b0a2-cb75a9f796de.filesusr.com/ugd/aba4c5_19007e778dd144bc8c0dd63b60775499.pdf?index=true
    • https://s3.amazonaws.com/vukusa/66154452614.pdf
    • https://s3.amazonaws.com/najipavez/les_types_des_analyses_mdicales.pdf
    • https://1416a32c-f91c-4ec3-9c10-bfdf610c7df7.filesusr.com/ugd/76de1a_6a9eeea0480c4502959e0ef85dc24705.pdf?index=true
    • https://s3.amazonaws.com/pexodugosa/murilepajizuresagozonu.pdf
    • https://bc5ba30c-e427-49eb-abc4-9677f18f04c1.filesusr.com/ugd/bcd086_e6ea8e2c188e43ee843e791ec47fe0f9.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001005f.bin
04b4b5a4f4dc3fada97ae398ad0dbf4cbe5813a21f795c8e7e9a8f7447fc480f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1005F 5488 bytes
font_01_sfnt_off000112e8.bin
3fcfac54229af01198dcc37782a184e2ad48dab3f8dffd31016ed0fc935d03e4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x112E8 10964 bytes

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