Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b381d0f3e379f64…

MALICIOUS

PDF

82.0 KB Created: 2021-09-09 09:49:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 91f18d15990ba70d3d7400b047a8ce07 SHA-1: 7b7122ba929052597f3a8c489c5fe34659271b62 SHA-256: 5b381d0f3e379f64401e634b13c20775115829afd5b2afe8c1677c2682de4859
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as a phishing trojan and ML classifiers indicated a high probability of maliciousness. The document contains a link farm with numerous disposable domains, suggesting an attempt to obscure the true destination. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate it is designed to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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 http://burragebrothers.org/demo/jolie/beta/userfiles/files/87685005276.pdf
    • http://aokisuper.com/ckfinder/userfiles/files/54445376688.pdf
    • http://sibzakon.ru/ckfinder/userfiles/files/wejujobiwozujojij.pdf
    • https://minjar.mebel18.com/uploads/files/seriv.pdf
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/161385c7a83ca7---61492158322.pdf
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/hofhprknkdd0t7dmjbt4cbus4b/38882550454.pdf
    • http://eunlocker.com/Images/Editor/file/60358322966.pdf
    • https://minhgianggroup.vn/upload/files/44486863965.pdf
    • http://hindel-relax.ch/ckfinder/userfiles/files/dupiwuxifomojuk.pdf
    • http://vinczeandlaszlo.com/upload/lexezizifovosug.pdf
    • https://goldgreiner.de/userfiles/file/xipikixujiwokokono.pdf
    • https://inprovitvenezuela.com/ckfinder/userfiles/files/53721861438.pdf
    • http://rabotatver.ru/userfiles/admin/65644777928.pdf
    • https://photojet.bg/userfiles/file/silapuxobajobogixugoveba.pdf
    • https://livre-art.com/ckfinder/userfiles/files/bemafujewuwunufiw.pdf
    • http://fra2ange.it/userfiles/files/32128731620.pdf
    • https://ethnicminorities.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/12948508502.pdf
    • http://britishcytology.org.uk/ckfinder/userfiles/files/zilexakevabaleseri.pdf
    • http://sooclose.eu/upload/File/71378660804.pdf
    • https://krusomying.com/data/file/96178066958.pdf
    • http://klm-co.ru/foto/ck/files/27687345310.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+fix+unfortunately+system+ui+has+stopped+working+in+android
    • 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://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_off0000d963.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD963 16792 bytes
font_01_sfnt_off0000f175.bin
286e8c87a52596207778ea40277a99be479f4d8e1c5bd30049518f9bc5c6c091		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF175 17748 bytes
font_02_sfnt_off00011f1c.bin
dade896d704931d599b6dc4eab1144cd9824333441a2adfa8f3886efd3af156e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11F1C 11428 bytes

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