Malicious PDF — malware analysis report

Static analysis result for SHA-256 22e8332e396c37b6…

MALICIOUS

PDF

84.3 KB Created: 2021-09-10 23:18:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 32b8a3254dbe47affe9595cbe57f4694 SHA-1: f78b9fcce90c80b55315254d2b269b59ccab627e SHA-256: 22e8332e396c37b66f62fbde598c66bc47946d15def16a0d742d956c1632352e
134 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 PDF files hosted on various domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for a large number of links, suggesting an attempt to obscure malicious activity. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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 http://systempro.kr/userData/board/file/nepizipamozetesa.pdf
    • http://z-sinpro.com/upload/files/97520383559.pdf
    • https://pu-sk.com/app/templates/js/ckfinder/userfiles/files/xegozekegojipida.pdf
    • http://rollfactorytogo.com/uploads/files/25694558383.pdf
    • http://www.520amis.com/upload/files/78682955770.pdf
    • http://oprandi.it/userfiles/files/8279487327.pdf
    • http://gyndoktors.de/ckfinder/userfiles/files/xopuzapa.pdf
    • http://terralis.net/catalogue_dynamique/file/giximuzesaluwutusowe.pdf
    • http://chroscina.com/userfiles/file/20925728060.pdf
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/16138bf1ca3389---xipidimimoborogupejanewup.pdf
    • https://acrgroup.nl/userfiles/file/pugejawuvikizinijixuvamas.pdf
    • https://bhiringisamsankalimandir.org/ckfinder/userfiles/files/17302307329.pdf
    • https://expobar.vn/app/webroot/files/images/pages/files/1515450600.pdf
    • http://kcpsystem.com/userData/board/file/61684188291.pdf
    • http://unternehmensberatung-hegenbarth.de/userfiles/file/41552986670.pdf
    • http://www.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/xubenakomatatoz.pdf
    • http://xn--80aap0abfiql8h.xn--p1ai/admin/ckfinder/userfiles/files/bufilatilefola.pdf
    • http://mecateengenharia.com.br/ckfinder/userfiles/files/wujefurolefidu.pdf
    • http://podushka.by/files/files/26652263835.pdf
    • http://photonart.nl/phpcmsys/file/76470847683.pdf
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16132c2ea1883b---90608378468.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=pubg+lite+bc+free+apk
    • 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_off0000e552.bin
c74d7e3b969b209ca50f11e5831eb169a7f6ed2d40a3a9ccace6391ecd00171d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE552 10596 bytes
font_01_sfnt_off0000fd74.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD74 16792 bytes
font_02_sfnt_off00011586.bin
394a5c6a50942f0139ada2075cda1a3e251fd766382bb8cc4eb0274262405131		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11586 18064 bytes

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