Malicious PDF — malware analysis report

Static analysis result for SHA-256 161d18ac23ad3952…

MALICIOUS

PDF

70.1 KB Created: 2021-09-13 01:33:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 08dc5712efd8e3e07c52da3301e071a7 SHA-1: e0bf97f3344313a742d9f16c206d90d05f1a94ad SHA-256: 161d18ac23ad395291d7a8c9420a0c57f05d2325c22db46be05c73872cc33635
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains embedded JavaScript and numerous external URIs, suggesting it's designed to redirect users to potentially harmful websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating a large number of links on disposable hosting, a common tactic for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://medvor.ru/uplcv?utm_term=minecraft+2d+download+android
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/cilp6gapoi2tioualhmjm0esq0/22575028299.pdf
    • https://towa-aaa.jp/userfiles/file/bezegizuzalubuxod.pdf
    • https://expobar.vn/app/webroot/files/images/pages/files/55331586863.pdf
    • https://quangcaowebsite.xemlaco.com/uploads/files/75685246919.pdf
    • https://unique-u.biz/images/uploads/file/nivizazibejifomigodomali.pdf
    • http://ituor.ir/basefile/chartermeinfo/files/tazisu.pdf
    • http://taigesw.com/upload/files/loburisubotefusofame.pdf
    • http://skia22.ru/pic/file/33058470546.pdf
    • http://conomiya.com/images/uploadedimages/file/xavakivuzara.pdf
    • https://alkirbilaw.com/userfiles/files/denedesagoxesovefuva.pdf
    • http://orchid-daikanyama.com/userfiles/file/fewukotebasatidogeji.pdf
    • http://ltmetal.com/userfiles/files/90717397710.pdf
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613e6ad61b8fd---jolavidasepoj.pdf
    • https://www.traitagri-solutions-alternatives.fr/ckfinder/userfiles/files/fakofakipolatuse.pdf
    • http://chokmanee.com/userfiles/file/9313024404.pdf
    • http://sgd42.ru/userfiles/file/32058680478.pdf
    • http://studioambienteterritorio.it/userfiles/files/naforawu.pdf
    • https://mygenius.ru/admin/ckfinder/userfiles/files/38694629475.pdf
    • http://carneiro-sa.pnh.pt/js/ckfinder/userfiles/files/vesuzazi.pdf
    • http://rivebistro.net/ckfinder/userfiles/files/54358274430.pdf
    • http://www.mezmat.ru/ckfinder/userfiles/files/nizabasuma.pdf
    • http://studioassociatoemc.com/userfiles/files/rusosovelibimopewotix.pdf
    • http://dmychadla.eu/UserFiles/File/96678552339.pdf
    • http://slesnick.net/userfiles/files/61106841740.pdf
    • http://kunbot.com/upload/files/netepusa.pdf
    • http://watthaistuttgart.de/userfiles/file/40170064587.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_off0000b5d7.bin
05a6a6362dae76b05f216b247a9b7f0f11b315348e54f52d0e62ddc206fa952a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB5D7 10500 bytes
font_01_sfnt_off0000cdf8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCDF8 16792 bytes
font_02_sfnt_off0000e60a.bin
d130860a56a2bdf3dfba3bb44bc83a62d836dbbc32e969e323d1cf36bd4f8b0c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE60A 14436 bytes

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