Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc984439f054bf24…

MALICIOUS

PDF

84.5 KB Created: 2021-09-13 13:37:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c3f9ed072ad9cb42f168ae8441ca26f0 SHA-1: d2315d935771b60d8113469a38a3927c70219815 SHA-256: dc984439f054bf24196e5eef015b6f4d58ddb30b91007b7d3c43b09e195c2d2b
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for exploiting vulnerabilities or delivering malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates the document is designed as a link farm, likely to obscure malicious URLs or distribute malware. The ML classifier and ClamAV detection strongly suggest malicious intent, with the embedded JavaScript likely responsible for initiating the malicious activity, such as downloading a second-stage payload from one of the numerous external URIs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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 http://goldenmallbiotech.com/upload/files/suxafuxu.pdf
    • http://gilendor.cz/userfiles/file/26571113337.pdf
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/riviwu.pdf
    • https://cancelaria.pl/galeria/file/ligodemuv.pdf
    • http://wumag.pl/userfiles/file/19957230577.pdf
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16135c45ee9f75---weziduxeliguzinivo.pdf
    • http://offerseir.com/basefile/offerseircom/files/namijitowarosu.pdf
    • http://mstreatmentadvances.com/userfiles/files/75087545657.pdf
    • https://sergiomauri.com/images/file/31608909490.pdf
    • https://iqrainternationalschool.org/_assets/files/gixudoketisulurakopulim.pdf
    • https://likeevent.it/writable/public/userfiles/file/xolopi.pdf
    • https://ienter.bg/files/sedegibodipilap.pdf
    • http://hsaltsj.com/uploads/files/59336405533.pdf
    • http://www.accessibilite-salle-eau.com/ckfinder/userfiles/files/79083978215.pdf
    • https://soenen-pneus.com/upload/file/tadajekipugevo.pdf
    • http://alrehabourhome.com/userfiles/files/68153843813.pdf
    • http://maschimaurizio.it/userfiles/files/kotojemilawabab.pdf
    • http://kozelsk-adm.ru/files/uploads/files/winam.pdf
    • http://jinruily.com/UploadFile/file/20210906122746304.pdf
    • http://theurbanbazzaar.com/userfiles/file/91739931754.pdf
    • http://sanarina.de/ckfinder/userfiles/files/jinesojawaga.pdf
    • http://gartenstadt-apotheke.com/userfiles/file/65056495802.pdf
    • https://ibeguiristain.com/userfiles/files/zevoligan.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=nice+guys+finish+last+book+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_off0000e31e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE31E 16792 bytes
font_01_sfnt_off0000fb35.bin
0f5be11dec6addcfd71b18878aafc7e2440dd926becac46939306392b508d7b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB35 11220 bytes
font_02_sfnt_off0001150a.bin
e93122b055107a1fb8b52dcfa2754146a2a37504b733f92216a5add006a198a8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1150A 18160 bytes

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