Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d5148d8d88809b9…

MALICIOUS

PDF

91.1 KB Created: 2021-03-29 10:43:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7ea540be4b1a6da2998eebd4971c301a SHA-1: 4120289f7f2100b5686d5b98e970f6879b7e858b SHA-256: 5d5148d8d88809b92c66701cb9f032609984669e9c742e3327802d4cfd6c8688
96 Risk Score

Malware Insights

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

The PDF contains an embedded URI pointing to a suspicious domain, which is a strong indicator of a phishing or malware distribution attempt. The ML classifier and ClamAV detection further support the malicious nature of the file. The document body, though heavily obfuscated, suggests a lure related to PDF watermarking.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • 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://soxebez.ru/award?keyword=insert+watermark+adobe+pdf
    • https://cdn-cms.f-static.net/uploads/4374853/normal_5fdc4c8be6882.pdf
    • https://cdn-cms.f-static.net/uploads/4374852/normal_6026192db7428.pdf
    • https://cdn-cms.f-static.net/uploads/4466151/normal_605f9ffab5598.pdf
    • https://static.s123-cdn-static.com/uploads/4417212/normal_5ff8c3f9b076f.pdf
    • https://static.s123-cdn-static.com/uploads/4426820/normal_5ffbb02c104ba.pdf
    • http://vewisono.iblogger.org/zatefamibatos.pdf
    • http://xivisugewikoju.iblogger.org/google_cloud_machine_learning_tutorial.pdf
    • http://sezugoramilepep.22web.org/game_free_fire_pc_windows_7.pdf
    • http://delozofize.scienceontheweb.net/botany_syllabus_for_ias.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://a4067306-84c0-45ce-9c36-3cbb795fcb37.filesusr.com/ugd/d5b970_4fda4e9e12d64743a08decd341e59a09.pdf?index=true
    • http://wazaranugaxexok.rf.gd/xijekakigasutafirad.pdf
    • https://s3.amazonaws.com/vososasoxumete/how_to_connect_a_home_theater_system_set_top_box.pdf
    • https://cf2e1f24-e5f1-4289-9567-3affce9c164e.filesusr.com/ugd/a4ea6c_3a9f0d8ed22c43f69beb6bef75d7c730.pdf?index=true
    • http://gixarewujedel.atwebpages.com/76424506810.pdf
    • https://s3.amazonaws.com/luropi/audio_converter_free_for_pc.pdf
    • http://puxedasepuk.epizy.com/what_is_a_declaration_of_custodian_of_records.pdf
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e505.bin
c24fe9b838e162ed22f377cc8d76fe97bde723f5f0dc9d83766970cfb2f48f5d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE505 16708 bytes
font_01_sfnt_off000119f2.bin
a7b32731b9e578c3d0d65c5cb27cf69d1ada6637c4306847c2485ad7de363ba3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x119F2 5128 bytes
font_02_sfnt_off00012b49.bin
94c6f91a772515209bd121ccb3f63a757b6b2ab619eb81d624ccf0a7d7ffcdeb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12B49 10964 bytes
font_03_sfnt_off000150b0.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x150B0 4324 bytes

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