Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8bb2259daaa5a12…

MALICIOUS

PDF

84.3 KB Created: 2021-09-21 08:22:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e620ad32908fbd4bac5bd54d772eeb64 SHA-1: 88a6e7f3ffa0ba9f86604bd391c189a5a71f6327 SHA-256: c8bb2259daaa5a12f3c6af118a5b26640f67c34d082d06f271ba7afee0fd1ce0
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 structured as link farms. The ML classifier and ClamAV detection strongly indicate 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 0.9911

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 https://pixomot.ru/uplcv?utm_term=what+is+the+best+live+wallpaper+app
    • http://runbo.net/upfiles/files/16312284922895.pdf
    • https://aashianarealty.com/file/danol.pdf
    • http://alvitraders.com/files/30301994488.pdf
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6b0b493b6---zuwubawevizim.pdf
    • https://ctners.com/ckfinder/userfiles/files/42006126350.pdf
    • http://1-sanya.com/blog_images/blog_/file/75486332938.pdf
    • http://nollve.com/img/editor/image/file/87278103162.pdf
    • http://mq-water.net/upload/92753544789.pdf
    • https://gtselect.fr/ckfinder/userfiles/files/bexoxowebipekenuto.pdf
    • http://xn--80adpfaaeictf0c6c7i.xn--p1ai/public/file/80658863441.pdf
    • http://marketypik.pl/zdjecia/fck/file/51040549293.pdf
    • https://path.mn/userfiles/files/nifibigodovonasowajen.pdf
    • http://contextuae.com/resimler/files/29056092146.pdf
    • http://qunjl.com/userfiles/files/dunawepigamo.pdf
    • http://fcraregistration.com/UploadedData/file/25104319127.pdf
    • https://zabulgaria.org/userfiles/file/67019018612.pdf
    • http://studioarclab.eu/userfiles/files/fozedefuxenovovi.pdf
    • https://vr-spagna-20.effievirtual.com/galeria/files/pofilejukina.pdf
    • http://elhammagazine.com/ckfinder/userfiles/files/58667268444.pdf
    • https://okazdedziecko.pl/_files/Media/file/dolasimesijoronateniri.pdf
    • http://progfin.pl/userfiles/file/36545501796.pdf
    • http://ecofincas.net/ckfinder/userfiles/files/7235794580.pdf
    • http://santiagoporter.com/js/ckfinder/core/connector/php/files/29255502118.pdf
    • http://archiw.gbpopatowiec.pl/img/upload/files/karudenobipawezes.pdf
    • http://vhktn.at/images/content/files/jedarilixumoj.pdf
    • https://netcsemege.hu/ckfinder/userfiles/files/68479329060.pdf
    • http://studiogeologicotrilobite.com/userfiles/files/nemutanimisas.pdf
    • https://smsenerji.com/resimler/files/58668088313.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_off0000e51e.bin
e003f981bffb2c7870515611373ff37c6178e116cae691ba08b72d98ef21ba8f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE51E 10408 bytes
font_01_sfnt_off0000fca4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA4 16792 bytes
font_02_sfnt_off000114b6.bin
482e1a6d9da6ab4ee8431b0d94a7b73c1b27a7b6b5253d04c31053f363540659		 pdf-font-stream PDF embedded font (sfnt) at offset 0x114B6 17908 bytes

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