Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdf4b27ba351c44e…

MALICIOUS

PDF

75.3 KB Created: 2021-04-05 13:41:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dac7f92f38dbbeb3562a49acf5142f26 SHA-1: 94682be45e72e427db9e5530d794cf436416be49 SHA-256: cdf4b27ba351c44e2a2c40c4ca03f96a6f9373ce7e6358104035fc0c214b89d2
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, forming a link farm, and is flagged by ML classifiers and ClamAV as malicious. The document body, though heavily obfuscated, suggests a lure related to 'vehicle inspection checklist pdf'. The presence of multiple suspicious URLs indicates an attempt to redirect the user to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://mezovuduw.ru/award?keyword=vehicle+inspection+checklist+pdf
    • http://usene.xyz/what_are_the_biblical_healing_fatsjspaj.pdf
    • http://dufasobogunojat.22web.org/world_religion_and_belief_system_book.pdf
    • http://white-x.fun/ammyy_admin_3._7_free_softonicz9q65.pdf
    • https://cdn.sqhk.co/vupapevixu/iblBFib/luduzowuxosopasu.pdf
    • https://cdn.sqhk.co/muvotugi/IYkRidi/87779274385.pdf
    • https://cdn.sqhk.co/kibizatududo/gfgPF9G/pulejinodufigujux.pdf
    • https://cdn.sqhk.co/netimawifes/ihijpsN/oxygen_concentrator_rental_near_me.pdf
    • http://scandisvet.ru/how_to_clean_echo_carburetorghkx8.pdf
    • http://kotudekudoges.getenjoyment.net/coliformes_totales_en_agua_purificada.pdf
    • http://gojovujewinunuj.mygamesonline.org/schaum_s_analytic_geometry.pdf
    • https://cdn.sqhk.co/derubejes/hiDzrsS/tonif.pdf
    • https://cdn.sqhk.co/lexelinowe/jdZjans/30889248630.pdf
    • https://cdn.sqhk.co/gituridewo/bxLjcha/53641669650.pdf
    • http://gukabibus.mygamesonline.org/vinisekire.pdf
    • http://peludofnor.fun/77767185042o2ow3.pdf
    • https://cdn.sqhk.co/jobasalem/jegchhH/music_player_s10_s10_style_edge_pro_apk.pdf
    • https://cdn.sqhk.co/desogepupema/jarjbih/50869099367.pdf
    • http://kulokozataxat.22web.org/23454229890.pdf
    • http://verifiedbadges-form.com/gudarerotq3.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://c07b3cb0-7d4a-4e65-9c62-eb3bd0ce3b6b.filesusr.com/ugd/7560d5_7eac7d65e7c1473c87f9de11345f7384.pdf?index=true
    • https://7605c768-a471-4169-85a9-0dab509fd250.filesusr.com/ugd/20ab23_82d417ebcc4b45569e64a93fef14058f.pdf?index=true
    • https://c0a42e0f-4cce-4e1b-84a6-2a5440198d67.filesusr.com/ugd/440b6d_ec38775445da4502b34a3badbfe48df4.pdf?index=true
    • https://a3c35cc3-4a3f-4d41-ab51-8b3e4b114d30.filesusr.com/ugd/2b25b5_b92a71b857184477b354d11bab1852dc.pdf?index=true
    • http://zutulig.epizy.com/pomofolaverokiwojareko.pdf
    • https://bc5ba30c-e427-49eb-abc4-9677f18f04c1.filesusr.com/ugd/bcd086_d9084f2f52224330a8af6cd7d64cce72.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_off0000ec1a.bin
3a58369902af3ed2f4263a5e5d42392606c03ae7a00fe15a72e4423473c34388		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC1A 4968 bytes
font_01_sfnt_off0000fd0f.bin
1fcf4cdd355d4b6a8eb77ef1bcd84ae91fd60f3b1683740c36c52b1faade2e99		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD0F 9920 bytes

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