Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d7ba64839348205…

MALICIOUS

PDF

81.5 KB Created: 2021-09-11 21:26:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7dc358c39ef95daf052615f1a1b21094 SHA-1: 52c2fc3d4d575bde34b496c37d6f37f17b2132cb SHA-256: 7d7ba648393482052e1307d09f3d6e976f91ccc10bd7259cc577244894715baa
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, with one specifically pointing to a URL containing 'windows_365_online_login' in its query parameters. This strongly suggests a phishing attempt to steal user credentials. The ML classifier and ClamAV detection further support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • 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://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/77ad0b3419716e1edae38525c65c3d1a/vikojebumajijuzugizaxemir.pdf
    • http://kamienneogrody.com/userfiles/file/29454161911.pdf
    • http://urbanposthotel.com/admin/ckfinder/userfiles/files/bazilonera.pdf
    • http://hb-hospital.com/file_upload/fck_upfile/file/80921015742.pdf
    • http://ping-property.com/user_img/files/62873742817.pdf
    • http://sangtaoad.com/uploads/userfiles/file/fapodubaduxoriton.pdf
    • https://kasihpaham.com/contents/files/vegur.pdf
    • http://articolo17.it/siti/usr/foto/files/xigukevi.pdf
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16131444018f2d---tidax.pdf
    • http://wecans.net/_UploadFile/Images/file/sunorewonekelanatuxiboles.pdf
    • http://www.huntsvillepr.com/files/files/82019680213.pdf
    • http://www.examnotice.in/uploads/files/jijezolegusadibusok.pdf
    • https://actor-conseil.com/files/file/63988716795.pdf
    • http://www.biosafety.biz/ckfinder/userfiles/files/xanurigexakaruga.pdf
    • http://all-vehicle.net/js/upload/files/vuxofezetatunuwovijamefi.pdf
    • http://kfoodntea.com/dataroom/file/roximudowiguw.pdf
    • http://xmzhj.com/UserFiles/file/fadazufeduwalerix.pdf
    • http://anoh.net/pds/userfiles/files/gasotamatuwipasivulaxepo.pdf
    • https://presentkompaniet.com/img/content/file/18975668117.pdf
    • https://gites-les-bardots.com/userfiles/file/sorodazaberupovire.pdf
    • http://nawooelcs.com/upload/userfiles/2021/09/files/210905043318.pdf
    • http://rld-carbon.com/file/netijaxixizib.pdf
    • http://www.yankey.com.tw/demo/public/editor/ckfinder/upload/user_upload/files/bikemusedebafajabogepofi.pdf
    • http://jinwoosmc.com/userfiles/file/94792857985.pdf
    • https://bahceneryaman.net/public/content-images/files/fusuzodokunijewuzutagala.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=windows+365+online+login
    • 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_off0000d7e9.bin
ef0b29985ef50d205aca9f83a2df02306289dcb0d5512e6ead8508ddbfec2c37		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E9 10616 bytes
font_01_sfnt_off0000f026.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF026 16792 bytes
font_02_sfnt_off00010838.bin
b11775e412d03ad2f852351d5ffaf5d33adcd498824a8254b46d37bacaca7aaa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10838 18520 bytes

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