Malicious PDF — malware analysis report

Static analysis result for SHA-256 a494b3792af146d4…

MALICIOUS

PDF

75.9 KB Created: 2021-09-24 19:53:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d46659411ba77323be6192db50ccd462 SHA-1: fe94f35a4b449718f571f8a3a2c208b28c364103 SHA-256: a494b3792af146d47530a6d460704e0c164306b0eccc1880eb336813d84818f9
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many of which point to potentially disposable domains. The 'SE_CALLBACK_LURE' heuristic indicates the document's content is designed to trick the user into calling a phone number, a common phishing tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to facilitate a phishing or scam operation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://auvergne.annuaire-regional.com/ckfinder/userfiles/files/juseruzatadodasenigu.pdf
    • https://www.abrasco.org.br/ckfinder/userfiles/files/nedapalirisarutod.pdf
    • http://kayapalinakliyat.net/file/kuvagapamupefe.pdf
    • http://franzoesischebulldoggen.eu/userfiles/file/dozesapapixosididiligif.pdf
    • https://www.terraton.com.my/ckfinder/userfiles/files/wopukoderasudera.pdf
    • https://stiff.pl/ckfinder/userfiles/files/87545808915.pdf
    • https://jooli.ru/ckfinder/userfiles/files/64815442969.pdf
    • http://aaaexpressac.com/userfiles/file/97234702886.pdf
    • http://fratellilongoni.com/userfiles/files/mojoxa.pdf
    • http://vipdiler.ru/files/file/23586349990.pdf
    • http://ooexperience.be/assets/Image/files/siwajix.pdf
    • https://mepho.hu/ckfinder/userfiles/files/wawedutefejazaridebapulik.pdf
    • http://cyc.cz/pictures/clanky/files/sapelikadefawitufo.pdf
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/84468aeaab04b40199f352cd31bfb258/xajebuziwonojosotibasapa.pdf
    • http://svadbavmoskve.com/content/xuploadimages/file/sozovoropas.pdf
    • http://kuresi-kaitori.com/upload/content_pic/files/4450714365.pdf
    • https://best-label.com/upload/files/levugogugaweserom.pdf
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/4odf9p0p430fml9j13lq5oe47h/gedagutumivumonulitoru.pdf
    • http://to-kajihan.net/js/upload/files/wugawovunopebesex.pdf
    • https://alexandrapanayotou.com/web/images/static/file/82435994093.pdf
    • http://himalayakebab.com/shipinc/userfiles/files/89508779338.pdf
    • http://bukharajohnscreek.com/sites/default/files/file/45289302670.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=ver+senha+do+wifi+salva+no+android
    • 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_off0000bcea.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBCEA 16792 bytes
font_01_sfnt_off0000d4fc.bin
4dd8cd7a1035e3dca64882df5da92ac156f24a9c82821929f5691f00c397c22a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD4FC 20696 bytes
font_02_sfnt_off00010a7a.bin
6b1815d94ea02b22cb75bd3c3dc192ddf8ff48d0e41b36d2ee0c7afb6b0ea6d3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A7A 10476 bytes

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