Malicious PDF — malware analysis report

Static analysis result for SHA-256 58ae865c2a5728fb…

MALICIOUS

PDF

112.8 KB Created: 2021-03-19 21:42:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6ed1aec0c5764a81c5510f1e484f92a2 SHA-1: 41c14db7bc542dbce789316755f3b5d70acc8dea SHA-256: 58ae865c2a5728fbd407eb358fbb06254245aae960a456ef4950d88a4f1f7316
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file contains a significant number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic. One of these links, 'https://resalured.ru/strik?utm_term=autumn+leaves+trumpet', is flagged as suspicious. The ML classifier and ClamAV detection strongly indicate maliciousness, with ClamAV identifying it as 'Pdf.Phishing.Trojan'. The presence of embedded URLs and the nature of the heuristics suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://resalured.ru/strik?utm_term=autumn+leaves+trumpet
    • https://static.s123-cdn-static.com/uploads/4501201/normal_5fc611c415b6b.pdf
    • https://static.s123-cdn-static.com/uploads/4501204/normal_5ff672cab70d6.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/339e310e-1db0-4b5f-9293-306a395d9dcb/48834026911.pdf
    • https://e942959e-95af-4115-ab05-a6e38533eaad.filesusr.com/ugd/66f7a0_b13884cb0f8142db95f050fad800ff00.pdf?index=true
    • https://s3.amazonaws.com/tometubufimopim/vomowepefo.pdf
    • https://uploads.strikinglycdn.com/files/17b81373-2238-4b27-8ee9-605a60851458/how_to_write_scripts_for_movies.pdf
    • https://8a6b9437-e7f2-49d7-8c24-351b272aa67a.filesusr.com/ugd/b18e4d_5b60197b07994f179a1f6b4b3b032ce5.pdf?index=true
    • https://s3.amazonaws.com/rotowan/segmentation_targeting_and_positioning_definition.pdf
    • https://s3.amazonaws.com/tipikaxe/mogejovu.pdf
    • https://s3.amazonaws.com/rodakarugupoko/ohio_guidestone_akron.pdf
    • https://d4078116-a2d5-466f-97e6-20d899f6ca30.filesusr.com/ugd/576447_2506c367525e487ba58497737fb38f9a.pdf?index=true
    • https://s3.amazonaws.com/kuxuxemu/27527046452.pdf
    • https://uploads.strikinglycdn.com/files/4349c9e6-edab-47d6-ac1d-749fcede59f7/38500376285.pdf
    • https://uploads.strikinglycdn.com/files/96e17f8c-3abb-4742-b023-ffe1fa5caa08/what_engine_does_a_2006_toyota_corolla_have.pdf
    • https://4b002d3c-a55f-42ce-816c-238f848e88a9.filesusr.com/ugd/3398cc_2fd41f1bc3ae46b48db4538f75386d93.pdf?index=true
    • https://s3.amazonaws.com/farefasejikap/diablo_3_characters_guide.pdf
    • https://s3.amazonaws.com/bugutaj/adobe_reader_update_11._0._23.pdf
    • https://s3.amazonaws.com/tufujifinobiro/fevozizepadeta.pdf
    • https://uploads.strikinglycdn.com/files/2133ff71-8b35-4e0b-9387-c021857bb430/viladekijujebevobu.pdf
    • https://s3.amazonaws.com/kudufigunabi/why_will_my_hot_tub_not_heat.pdf
    • https://e6b56e3c-1b88-4cfb-972d-ab1702b0a06e.filesusr.com/ugd/8c0e65_c23960eabf0747ada5f378e5c719ab86.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_off000170dd.bin
1edde7dab973f3c320f819e25a69e936c2f6c6c12a580189be6f876532f26c69		 pdf-font-stream PDF embedded font (sfnt) at offset 0x170DD 5012 bytes
font_01_sfnt_off000181d6.bin
102b5d7f230304fb004286e826f0a81a10b39fb088a0c8efa3467265d6bcf843		 pdf-font-stream PDF embedded font (sfnt) at offset 0x181D6 17188 bytes

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