Malicious PDF — malware analysis report

Static analysis result for SHA-256 ded3a5e2091e103a…

MALICIOUS

PDF

80.0 KB Created: 2021-09-14 21:32:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f08d7b62d6b99fca1e84ad27aa58fd50 SHA-1: d9b6dbe1f99cef5043b55d7ecba12950a89ebc29 SHA-256: ded3a5e2091e103a54decfd202acfa8bf35c243014e5c58262f7cbb2127c0d7c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for malicious PDFs to execute code or redirect users. The presence of numerous external URIs, many pointing to potentially disposable domains, and a high ML classifier score strongly indicate malicious intent, likely for phishing or malware delivery. The ClamAV detection further confirms its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://shopabrang.com/images/files/11844182243.pdf
    • http://studio-castiglioni.com/userfiles/files/81711054515.pdf
    • http://bachova-terapia.sk/images/file/noxukidarigovubaxidiwe.pdf
    • http://seedcambodia.org/htdocs/cljr/data/files/lebunarelixupawev.pdf
    • https://sskundal.com/userfiles/file/81053254921.pdf
    • https://anjingliar2.com/contents/files/zunokapuwetuwuz.pdf
    • http://ysh.my/userfiles/file/49629771009.pdf
    • https://www.clinicaepilepsia.cl/ckfinder/userfiles/files/birijepezabix.pdf
    • http://constantemails.com/userfiles/file/1631592508tixoke.pdf
    • http://chipublichouse.com/ckfinder/userfiles/files/54471162946.pdf
    • http://bubb.cn/up_file/file/rekusamipobovuk.pdf
    • http://www.parkwaytransplant.com/media_upload/upload/files/10139863448.pdf
    • https://bushregenerators.biz/userfiles/files/54878410222.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613400ae0bc70.pdf
    • https://www.champagne-cornevin.fr/ckfinder/userfiles/files/11692288528.pdf
    • https://thehouseproduction.net/file/vegerozi.pdf
    • http://xn--2e0b95unoa536adofm5h.com/userfiles/file/28604755066.pdf
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/16132b8a257834---vivuwaxumexoterul.pdf
    • http://autofactory-jin.com/js/upload/files/15848503782.pdf
    • http://gerocuki.hu/user/file/72287531445.pdf
    • http://ibtaker.ps/userfiles/file/japafeweparopiw.pdf
    • https://repairbase.net/FCKeditor/editor/filemanager/connectors/php/images/file/56758328279.pdf
    • https://mondoaudio.it/img/uploaded/file/vejodiwejebijuporane.pdf
    • https://kattliv.com/kattliv/admin/userfiles/file/9522852672.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=khatabook+apk+download
    • 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_off0000d507.bin
987049629e906c47611ca3dde9be001f12e97e21ea3b6d108822f0c4d29dbeb0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD507 17868 bytes
font_01_sfnt_off0001030e.bin
3a03fc11edb4297f702317cfae00703856edeefb2e108e003c1e8233ba28d5d5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1030E 10308 bytes
font_02_sfnt_off00011a09.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11A09 16792 bytes

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