Malicious PDF — malware analysis report

Static analysis result for SHA-256 740cf7e0e579b9de…

MALICIOUS

PDF

68.0 KB Created: 2021-09-27 22:15:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2e75bcdc5d9781814ad1f992d2bbfd78 SHA-1: 821558de1a2aa7c10ae77ae5fab7c5530298e0c5 SHA-256: 740cf7e0e579b9de39328bf6eab576b3f845af18715c9b007db0eabd5138f6ea
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF is identified as an image-only document designed as a lure, typical of phishing campaigns. It contains numerous links to external sites, many of which are hosted on potentially disposable domains, suggesting a link farm used to obscure the final destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to a malicious site for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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.
  • 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://www.champagne-auge-dascier.com/ckfinder/userfiles/files/pemijejubitegigove.pdf
    • http://ashole.hu/UserFiles/File/57981104723.pdf
    • http://churchtextile.com/userfiles/file/lopaxenarefonolesumeduna.pdf
    • http://22vek-omsk.ru/fck_editor_files/files/85344928129.pdf
    • https://bharatiyabhashaparishad.org/ckfinder/userfiles/files/mazosikeravefo.pdf
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b597d0315d---43639691432.pdf
    • http://daithanhnam.com/upload/files/xejezawaforogepukaromas.pdf
    • https://wineart.online/userfiles/file/90453164273.pdf
    • https://callmarkinvestments.com/callmark/files/nijevupuxekoripo.pdf
    • http://karimeh.com/public/userfiles/file/mavexagigoxesebatajabes.pdf
    • http://pokrowce-ochronne.pl/Upload/file/39764110355.pdf
    • https://everestart.com/images/stories/file/48085342906.pdf
    • http://phayaotechno.com/UserFiles/File/dinorapovokoli.pdf
    • http://www.tobywells.org/media/fckdir/file/lokivafuzojupeluli.pdf
    • http://wdnederland.nl/file/45674975451.pdf
    • http://joyandwowbook.com/upload/file/35892047196.pdf
    • https://buddhaart.in/userfiles/file/36309042890.pdf
    • https://valkexclusief.reviewz.eu/app/webroot/files/userfiles/files/lakileg.pdf
    • http://munnartourism.com/uploads/file/14540697289.pdf
    • http://hyundaihungthinh.com/uploads/images/files/tofegu.pdf
    • http://xn--80aaae7amexjfdlfdfg.xn--p1ai/files/file/7956443614.pdf
    • https://bhsbeacon.com/FCKeditor/file/5278796344.pdf
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/vixotuvesitojarane.pdf
    • http://sluchatka-shop.cz/files/upload/files/fumugizukiwu.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=martin+luthers+95+thesis+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_off0000ae96.bin
c901c9d33a1023060585b79748074ce9e652cb3d1dbc382508f2631d669fba3a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAE96 10872 bytes
font_01_sfnt_off0000c7a8.bin
cec9b8cec0535fdc180559bc99aed0b87fb228f4dc438449d6999a9cc8f3e0ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC7A8 14168 bytes
font_02_sfnt_off0000eab3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB3 16792 bytes

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