Malicious PDF — malware analysis report

Static analysis result for SHA-256 6931a1245dcaff0c…

MALICIOUS

PDF

85.1 KB Created: 2021-10-05 20:34:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 369d69ee7cdc1df8ae31d9ea58943b9a SHA-1: 96125da591ec7f47330f6b0d0b081d0a19c7b773 SHA-256: 6931a1245dcaff0c4ffca55546eebb2eaf5a53bb6b7ac4a0bcff71c474e6868f
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable domains and are indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://xn--e1aazeoc7d.xn--p1ai/images/shared/file/73529647605.pdf In PDF document text
    • http://wsmr.us/userfiles/file/famowugowakeleguti.pdfIn PDF document text
    • http://dinhviht.com/images/newtech/files/796359253.pdfIn PDF document text
    • http://adm.stikom-db.ac.id/js/uploads/files/lajeredulamude.pdfIn PDF document text
    • https://agentcctv.com/userfiles/file/rapinerupuxodefid.pdfIn PDF document text
    • https://biographiewerkstatt-singer.de/userfiles/file/bozonalinije.pdfIn PDF document text
    • http://chemtron-vostok.ru/media/file/80704002374.pdfIn PDF document text
    • https://contact-house.com/fckeditor/upload/file/47162826997.pdfIn PDF document text
    • http://jin16888.com/userfiles/file/fifana.pdfIn PDF document text
    • https://www.benkorner.nl/admin/library/ckfinder/userfiles/files/58051107496.pdfIn PDF document text
    • http://jjinline.org/file_upload/file/91579777618.pdfIn PDF document text
    • https://kentacademymiango.com/userfiles/file/lopilujetikalabaletemopiz.pdfIn PDF document text
    • http://luchetti.it/userfiles/files/vusobi.pdfIn PDF document text
    • https://sacc-la-chaux-de-fonds.ch/fichiers/file/56021225778.pdfIn PDF document text
    • http://autodilygood.cz/files/file/94786217178.pdfIn PDF document text
    • http://www.luna1956.com/images/library/File/zazaxujajirilujapikapim.pdfIn PDF document text
    • https://108pizza.pl/uploads/userfiles/files/wowixukejowalod.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/e64252e888297e63504ec5144e2bf0c6/gilogitowaboja.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614f6aa869a86---tukor.pdfIn PDF document text
    • http://minuspk.ru/minuspk.ru/userfiles/file/romomikimefubamewogadiwa.pdfIn PDF document text
    • http://kirsanov-maslo.ru/uploads/niralotisoto.pdfIn PDF document text
    • https://rrr71.ru/upload_picture/87304585874.pdfIn PDF document text
    • http://mayphatdienngocquang.com/media/ftp/file/64177254180.pdfIn PDF document text
    • https://tenshinorchids.com/FCKeditor_upload/file/wuxazizig.pdfIn PDF document text
    • https://shastriratanchatterjee.com/ckfinder/userfiles/files/daxepolibavuxiwu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=fax+575+brother+manualPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000daa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA1 10616 bytes
SHA-256: ed5c1fd20d1f1cfd138471c3d1d791ddfdc10be1db91ec1db99efc8b5bb841ac
font_01_sfnt_off0000f2d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ae8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AE8 22892 bytes
SHA-256: 38fc02f942f056d9aa5839509a1ea463b957c0db99997b2ab6f612188104c6d9