Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8d744a9fe76effc…

MALICIOUS

PDF

86.6 KB Created: 2021-09-24 03:21:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 42281532dfa03772cfb79873cc86645c SHA-1: ab8db816a200539ed7a9e5e6ffe9a08c01916352 SHA-256: d8d744a9fe76effcfac3ad06f53e5cf9ce2928c954296c581137224a40b69e09
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading further malware or engaging in phishing. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://queure.ru/uplcv?utm_term=download+star+wars+the+force+awakens PDF link annotation
    • http://tw-sincere.com/upfiles/editor/files/5625776348.pdfIn PDF document text
    • https://sesconbs.org.br/ckfinder/userfiles/files/98111780676.pdfIn PDF document text
    • https://bhiringisamsankalimandir.org/ckfinder/userfiles/files/liratulosujeti.pdfIn PDF document text
    • https://postelezmasivu-ostrava.cz/ckfinder/userfiles/files/nikuvijegege.pdfIn PDF document text
    • http://www.huntsvillepr.com/files/files/dodirorirewub.pdfIn PDF document text
    • http://fcgo.tw/uploadpic/files/46147881790.pdfIn PDF document text
    • https://martabaktelor.com/contents/files/828019117.pdfIn PDF document text
    • http://hondaototanan.com/upload/files/73664674357.pdfIn PDF document text
    • http://bankerz.in/qpic/files/87823367175.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/38415761818.pdfIn PDF document text
    • http://saatgaamkansarasamaj.com/admin/uploads/files/wasesujo.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f725fb489b---dufeluvafixarimepelomoma.pdfIn PDF document text
    • http://stefani.cz/fck/file/labilizatikidabuwudadosup.pdfIn PDF document text
    • http://firsttimehomebuyerstudy.com/images/file/9921237957.pdfIn PDF document text
    • https://kebecelectrique.com/upload/editor/file/bolagedobinenexipiwusa.pdfIn PDF document text
    • http://sasmedm.com/www/js/ckfinder/userfiles/files/42568695710.pdfIn PDF document text
    • https://dragonexpressml.com/userfiles/files/wezede.pdfIn PDF document text
    • https://redac.ch/upload/vemivamoxadafosanal.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/161419bd291f6e---maxabipugadusim.pdfIn PDF document text
    • https://educationindiajournal.org/ckfinder/userfiles/files/72826376448.pdfIn PDF document text
    • http://td-mg.ru/uploads/files/2054389506.pdfIn PDF document text
    • https://vnnc.vn/img-hdmedia/files/97770537876.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/14479258231.pdfIn PDF document text
    • http://gekon.net/userfiles/file/98686990717.pdfIn PDF document text
    • 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_off0000e9b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B3 19192 bytes
SHA-256: a4f0a323470783e1f81a1e5202997266d068d06c6400be923c54b447a6f3e6e5
font_01_sfnt_off00011be1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BE1 10660 bytes
SHA-256: eb06820ca14c90141886c8062e076b5de51ed47a150f3409799ba995074bbea7
font_02_sfnt_off00013459.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13459 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1