Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0d4a03cff29289a…

MALICIOUS

PDF

81.2 KB Created: 2021-09-15 11:24:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6b35d2b0cc1c557e57f2c7be8fadca21 SHA-1: fc07311dadbdceadc65a43c93ed8dae2e22dde8d SHA-256: f0d4a03cff29289a1c56358ce92a5afcddda216368afa692d5ae83349758a60f
114 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URLs, many of which are part of a link farm on disposable hosting. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to decrypt an archive, a common tactic to evade gateway scanning. The embedded JavaScript suggests an attempt to execute malicious code, potentially to download and run a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://laborke.ru/uplcv?utm_term=avatar+android+download
    • http://huijingweb.com/upload_fck/file/2021-9-12/20210912225700796564.pdf
    • https://pontus-sd.eu/uploads/file/ranadutu.pdf
    • http://rama-sp.com/rama/webroot/js/ckfinder/userfiles/files/93616152033.pdf
    • http://imcborivali.org/userfiles/file/sawotapuvukesabet.pdf
    • http://crabandclaw.com/uploads/files/27977607737.pdf
    • http://tiszaikaland.hu/upload/file/38183311996.pdf
    • https://mosaicopeoplecorporation.com/ckfinder/userfiles/files/89114612942.pdf
    • https://testpensija.bankai.lv/ckfinder/userfiles/files/peleremovotegotorikazi.pdf
    • https://taybaite.com/userfiles/file/9282884411.pdf
    • http://www.polni.si/Images/files/27398150195.pdf
    • http://www.macrolepidoptera.hu/userfiles/files/33207496577.pdf
    • https://stratasphere.online/userfiles/file/3460721223.pdf
    • http://www.romanschatztruhe.de/img/files/jadasodugibexis.pdf
    • https://liepasmuiza.lv/userfiles/library/68814253757.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/hhl9d2ijsq90ak7hdarc1nce86/97632289588.pdf
    • http://thanhcongtechtra.com/upload/files/74283105119.pdf
    • http://tantusmarina.com/UserFiles/file/42744988015.pdf
    • http://rideabikenews.com/user_img/files/pijawesiwibojixetuside.pdf
    • http://sromedical.com/file_media/file_image/file/tukodumu.pdf
    • https://paulogomeslda.com/userfiles/file/98326700687.pdf
    • https://mysilo.com/upload/ckfinder/files/72153991321.pdf
    • http://tv-sat.cz/userfiles/file/66310671103.pdf
    • http://turar-mussin.com/userfiles/File/gotofemobigoxurunevufowo.pdf
    • http://theonejsc.com/userfiles/file/jasowera.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://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_off0000da4c.bin
fea500066e2bf6332df7e023546d7ee38f2712b010c7d9177829a43d4824f519		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA4C 17708 bytes
font_01_sfnt_off00010839.bin
6f6becd98fa917759004f42d5e309fa737ff4a6c7f22530d2eb2f087dc1405b5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10839 10072 bytes
font_02_sfnt_off00011ec4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11EC4 16792 bytes

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