Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4a42c33cbaf5698…

MALICIOUS

PDF

89.4 KB Created: 2021-03-25 03:51:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fe7621dadaa442d4b868e02b3f859d1b SHA-1: 69779192c0ed383bf4c9afc1edb56dd99a29f4eb SHA-256: c4a42c33cbaf5698d6e60a4af4bb8dfe933cfe866b5b0cfa02147601f467eeb4
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, with the primary one being 'https://lozipotod.ru/wix?keyword=ap+biology+photosynthesis+reading+guide+answers', suggesting a link farm or phishing lure. The heuristic 'PDF_SEO_LINK_FARM' further supports this, indicating the PDF is designed to host a large number of external links, likely to SEO-poisoned content or phishing sites.

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://lozipotod.ru/wix?keyword=ap+biology+photosynthesis+reading+guide+answers
    • https://cdn.sqhk.co/jigixomavola/e4rnLgi/32349296073.pdf
    • https://cdn.sqhk.co/lunapolakezo/6G4ianM/vrse_jurassic_world_instructions.pdf
    • https://numojuwavusori.weebly.com/uploads/1/3/4/7/134728722/mojes.pdf
    • https://cdn.sqhk.co/dodufiruw/diaDMKD/72415281507.pdf
    • https://cdn.sqhk.co/kisoxukapab/c5kXGii/38159813646.pdf
    • http://tibagisuminove.sportsontheweb.net/faxilamipeli.pdf
    • https://cdn.sqhk.co/xafogatok/igjjaje/life_after_death_movie.pdf
    • https://jadigitunuw.weebly.com/uploads/1/3/4/6/134672933/jubilopovomorubija.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://bexotomilobawa.epizy.com/igloo_ice_maker_manual_ice103.pdf
    • https://bc732cde-fb09-4fee-8ab5-c82a45a1131b.filesusr.com/ugd/2ac701_53799d3d874346359f4e3b1f286a767d.pdf?index=true
    • http://tipiwozametorol.epizy.com/19257800159.pdf
    • http://zadosuwiwebuw.epizy.com/spring_boot_security_documentation.pdf
    • http://buvelijixuzumu.epizy.com/64170041349.pdf
    • http://kipejefanowisu.atwebpages.com/pretty_good_vs_very_good.pdf
    • https://b3a8b944-ddec-4d17-9b53-5a1c05c66d8c.filesusr.com/ugd/314503_cd779626266746b594aad36ba81e7d77.pdf?index=true
    • https://1c684d3d-b1aa-4d58-8f8e-408f9cf37fac.filesusr.com/ugd/64d889_cdab4790cb944fa7bb9f2c88df8dcacb.pdf?index=true
    • https://da99f664-88c7-4a27-98aa-0bbcec2e8f57.filesusr.com/ugd/66f3f9_5f7b039da41046aa8097924067a702e7.pdf?index=true
    • http://suxudogakol.myartsonline.com/why_wont_my_garmin_watch_turn_on.pdf
    • https://8d6920c1-aef5-45ed-b1a0-e693d63948fb.filesusr.com/ugd/0a593f_bce1b5cd700e4fdea16edba953a667c0.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010682.bin
c5dd26551ebff63fea5c4b954a4a4647c7785dabc08b86dca631d1b350e6dd12		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10682 5544 bytes
font_01_sfnt_off00011968.bin
047a02d16964928de21164cb3bbaf3c7b3e271ef42f0f821644bcdd97878f252		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11968 11672 bytes
font_02_sfnt_off0001417b.bin
2173a1880e9f774f759393e7d0d28dda91d04d8a3eae6bea41b822770b343b90		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1417B 16060 bytes

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