Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c1b39a9a95e03fa…

MALICIOUS

PDF

69.3 KB Created: 2021-09-26 10:38:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fc48ddf8da65105f677e9fac1a2c3ccd SHA-1: 582588c24fe3fb78f08df84db5f3f6bbc60ac29a SHA-256: 1c1b39a9a95e03fa51965963f624d6b1630a866c86fcc486b3c50be3459e9815
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection as a phishing trojan. It contains numerous embedded URLs, many of which point to suspicious domains and are structured to appear as file downloads, indicating a likely attempt to redirect users to malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further suggests a link farm designed for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 5

  • 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.
  • 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://kimandyoo.com/userfiles/file/50081892854.pdf
    • http://ensky-chemical.com/upload/files/jutasibomavagumefajov.pdf
    • https://aadhaarretail.com/administrator/imagetemp/file/94222331938.pdf
    • http://heathrowairporttaxi.website/userfiles/file/nilabufovokolev.pdf
    • http://webmba.fr/client/logo/file/81520875137.pdf
    • https://biserica-izvorul-tamaduirii.ro/files/mosigozutobobuzekezido.pdf
    • http://kkc1.org/htdocs/cljr/data/files/57601505804.pdf
    • http://travelbilet.ru/sites/default/files/file/vidaxaguxexisolomib.pdf
    • http://dongamold.com/fckeditor/upload_files/file/kozomubujapopo.pdf
    • http://tai-yang.tw/taiyang/upload/file/tubipexik.pdf
    • https://0a3exp.com/upfiles/editor/files/malote.pdf
    • http://forestheightsgarden.com/ckupload/files/sakixalidijogogo.pdf
    • http://laptopcuhaiphong.vn/upload/files/logafur.pdf
    • http://quangcaovuanh.com/vietkiendo/upload/file/92594852086.pdf
    • http://hotstamping.pl/files/file/malex.pdf
    • http://www.smwiarus.pl/ckfinder/userfiles/files/notizuxabimonabobunab.pdf
    • https://marathonlaval.com/userfiles/files/puregogafojoxirogumose.pdf
    • http://pomodorolennep.de/gfx/userfiles/files/jigowiditiwusakila.pdf
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1614148c24dad8---kurazukatogogirusit.pdf
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/75007cf63ddd251ce8931cadba0e8d44/bivilokosarijetijato.pdf
    • http://wordtmann.beckbauer.eu/ckfinder/userfiles/files/2338253727.pdf
    • http://sunmoon-glory.com/web/upload/files/24651237821.pdf
    • http://oishisushigd.com/uploads/files/68682533135.pdf
    • http://espaciocultivarte.com/ckfinder/userfiles/files/katibobamixosuwitididafut.pdf
    • https://dyaa.club/uploads/file/55486649988.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=die+hard+1+cast
    • 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_off0000b084.bin
755aaa034e1bbed2faaa77aab3b7a5bfe835c85b24dcbe04810f92ce93b811b6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB084 10248 bytes
font_01_sfnt_off0000c7c1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC7C1 16792 bytes
font_02_sfnt_off0000dfd3.bin
71e48cad5025957f24d1d0de374a73a7d331f4df8d017c0d5636640162b2ae98		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD3 16004 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.