Malicious PDF — malware analysis report

Static analysis result for SHA-256 3eadf6736b6ec3a3…

MALICIOUS

PDF

84.8 KB Created: 2021-09-17 10:14:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e66033f547d2018979e8322de70d72ea SHA-1: 35ed1c6ea4f966f318eb0f65070dc37e88b4e445 SHA-256: 3eadf6736b6ec3a3603375b28a5b0053b1724c8089aa740f2e6830c8df2a829d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous embedded URLs, many of which point to disposable hosting and are structured as a link farm, a common tactic for phishing or distributing further malware. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically identifies this pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://infrive.ru/uplcv?utm_term=android+firewall+app
    • http://ecosdaliberdade.com/ckfinder/userfiles/files/zetafox.pdf
    • https://mamadona.ru/ckfinder/userfiles/files/35167737848.pdf
    • http://blackhorsesc.pl/userfiles/file/pepadixutusej.pdf
    • https://semot.com/Store/userfiles/file/61099280296.pdf
    • http://brenderup.ro/mm/file/96920444021.pdf
    • http://palaciodelosnavas.com/userfiles/file/morusalefexelego.pdf
    • http://quaint-house.com/images/blog/file/ruferepekafukutowimekixar.pdf
    • https://priscar.com/documents/files/rozofivikizudidugide.pdf
    • http://gewald.ru/content/Files/88299203195.pdf
    • http://ijfbn.com/editor_up/laxubisawilijawikedujote.pdf
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/161410f688c5d7---nanigolikumasomofejiximo.pdf
    • https://indobaliart.com/sitefiles/file/pizumapikazosowova.pdf
    • https://automatisme-portail-bordazzi.fr/userfiles/fichiers/50011834462.pdf
    • http://sofia-es.tokyo/yamituki-n/uploads/files/golutanebibusatup.pdf
    • https://hsse.cl/files/33827020435.pdf
    • http://happyorderfood.com/uploads/files/wesevopimusenevekorewuzo.pdf
    • http://orchid-daikanyama.com/userfiles/file/pojumixawob.pdf
    • http://www.siposferenc.hu/html/jatebetorakubofubizusosu.pdf
    • https://lighthousemacau.com/html_upload/file/bazosirajenesezetupumu.pdf
    • http://nerezove-kuchyne.cz/UserFiles/File/xuzetatibekutat.pdf
    • https://pharma-tools.eu/galeria/file/vaniteravegunuladuk.pdf
    • http://newgrids.com/userfiles/file/duvadefeloja.pdf
    • http://tycoonmedical.com/userfiles/file/nabugamogob.pdf
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/f26924f77a4f18ed897892e64827b3aa/buromakinuxawirigibo.pdf
    • http://dealershop.es/userfiles/file/84890863067.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_off0000e7b0.bin
589ac471552c351ad691d23ea179041e203a9d752351e03dce58ab64c20e92d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B0 18056 bytes
font_01_sfnt_off0001169d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1169D 16792 bytes
font_02_sfnt_off00012eb4.bin
64d2f5e823844e064f8db079c80ba8a54cd7fd7a1cca67d86e92ed6aa0b30559		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12EB4 10292 bytes

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