Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f149d7196d9cc2a…

MALICIOUS

PDF

92.6 KB Created: 2021-09-09 14:14:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d37f04307adc9106213b639daa1deb40 SHA-1: 521252df64675393288f0b757e6e387c7e73fcc5 SHA-256: 7f149d7196d9cc2ae7cc3b9ceca77ab0adf62e1b7776a4af4ad526d1748002ac
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript, a common technique for delivering malicious payloads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or exploitation. The embedded JavaScript is likely responsible for downloading and executing a second-stage payload from one of the numerous external URLs found within the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 https://nacionalequipamentos.com/ckeditor/uploads/files/jagusuwe.pdf
    • https://netron.pt/app/webroot/media/files/sewenumonaliwadopipafedu.pdf
    • http://hasdeu.md/data/userfiles/files/22234040430.pdf
    • https://derfo.info/resimler/files/vumoxelape.pdf
    • http://parejalecaros.com/adjunto/upload/fck/files/20205433959.pdf
    • https://www.icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/kopubugemasibizeg.pdf
    • http://www.ciesol.es/ckfinder/userfiles/files/59354799764.pdf
    • http://beta-rc.com/upload/files/90573174556.pdf
    • https://deltaguvenlik.net/userfiles/file/7050743621.pdf
    • http://crosswaysrecruitment.com/userfiles/file/faxagasonif.pdf
    • http://galantemontagnana.it/ckfinder/userfiles/files/13623952945.pdf
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/jln9qtj55rkm710h57alkpgcqg/44642506367.pdf
    • http://darec.sk/files/files/45715047159.pdf
    • http://krajinar.cz/soubory/files/likafuralemibomovurikoz.pdf
    • http://pk.mo/userfiles/file/dawupuwudikozukuxajumuzi.pdf
    • https://kurek-rowery.pl/user_pict/file/8848391317.pdf
    • http://rosg.net/sa_upload/userfiles/file/20210901133244.pdf
    • https://memorybg.net/app/templates/js/ckfinder/userfiles/files/28060222609.pdf
    • https://stmpallet.com/ckfinder/userfiles/files/15369999970.pdf
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613593bac11e4---dawarosupoxiwawotusozalak.pdf
    • https://hotelcorona.ro/files/7291450982.pdf
    • https://dehayemek.net/upload/ckfinder/files/kimidupobuvazasujanigu.pdf
    • http://trans-serwis.com/userfiles/file/93765595681.pdf
    • https://onlineadda.organicemall.com/ckfinder/userfiles/files/31052800511.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=german+shepherd+breed+group
    • 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_off00010563.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10563 16792 bytes
font_01_sfnt_off00011d7a.bin
665fd686dc605b1a6a02f19eb42c686767503dc9dad61be1e989e89cb149674f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11D7A 10884 bytes
font_02_sfnt_off000135f5.bin
7ef7cc8497b418c3eaa77aed17da28727e4ce3d3009fddcf71480b1957950cb3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x135F5 17992 bytes

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