Malicious PDF — malware analysis report

Static analysis result for SHA-256 c090c891d9d38893…

MALICIOUS

PDF

78.1 KB Created: 2021-09-18 15:49:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 113d409b5defca542ee2287d046eaf05 SHA-1: 0d0154ed0b0553c198d7cc884a7d969975664def SHA-256: c090c891d9d3889377264ce4d58ae726578082f1a7a80a60a0ac817719d8102e
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many of which point to disposable domains and are algorithmically generated. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to facilitate the redirection to these malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://archism.ru/uplcv?utm_term=zookeeper+cheats+android
    • http://ovstav.cz/app/webroot/files/files/gejexekozuvemef.pdf
    • http://kino-cosmik.ru/sadm_files/94784725918.pdf
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131f722ac3d6---foxibupegemoxuzoxuganox.pdf
    • http://inistor.com/ufiles/files/42235521357.pdf
    • http://gerocuki.hu/user/file/23506396518.pdf
    • http://skoleniridicu-online.eu/ckfinder/userfiles/files/60982879050.pdf
    • http://peoplefineart.com/assets/202109/files/20210903093052446997.pdf
    • https://wanfutemple.urwaydesign.com/data/file/userfiles/files/vafinotazowimanamud.pdf
    • http://ambulatorioveterinariobubiniregini.eu/userfiles/files/kagupanexuwugofumononop.pdf
    • http://rajasthanmetals.com/userfiles/file/45751691838.pdf
    • https://elitstroycraft.ru/source/file/nebikomitadoson.pdf
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613005da8feb8---5697097897.pdf
    • https://mashura.co/userfiles/files/82099242567.pdf
    • https://vocembalo.ch/userfiles/file/bavinemilemuwivupe.pdf
    • https://cnn-logistics.com/asset/files/46159846156.pdf
    • http://nutranghongngoc.com/media/ftp/file/9352228791.pdf
    • http://xn--80aafjbawrcdgsodbdciig4a5v.xn--p1ai/pict/file/43418119042.pdf
    • http://plusk-car.com/js/upload/files/xigagujosefaribe.pdf
    • http://radioevangilereal.com/assets/ckfinder/core/connector/php/uploads/files/suninofobakefupitamupu.pdf
    • https://granitabrasive.ro/editor_up/94056293842.pdf
    • http://macabrey-luthier.fr/data/Files/nobaxejo.pdf
    • http://bowenlawmt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sojim.pdf
    • https://manenshop.com/upload/files/11911828991.pdf
    • http://burragebrothers.org/demo/jolie/beta/userfiles/files/babadufoju.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_off0000caf2.bin
179c1077e5f0a03d5968ca55cb6da3386a3a93b78fb84346b779dc491162303c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCAF2 17660 bytes
font_01_sfnt_off0000f8e3.bin
4f87e536a01581cde2b158f596ce16e07e61c9ca0617c560005aafd90ff320c3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E3 10620 bytes
font_02_sfnt_off0001112d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1112D 16792 bytes

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