Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbead73143664366…

MALICIOUS

PDF

80.4 KB Created: 2021-09-14 04:04:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c60c1a548fc3afcdcb8fc0756165e696 SHA-1: c4f3da25a2bdc9f7177e8a32fac1f9d595a660bc SHA-256: dbead731436643667287525315785ce0bd929f6baf5d6cfdec944067fe723c1d
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely responsible for redirecting the user to one of the numerous malicious URLs.

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 https://infrive.ru/uplcv?utm_term=android+marketplace+application
    • http://gtlitalia.com/userfiles/files/mifutuwapuletapikeduge.pdf
    • https://stpm-sa.com/userfiles/file/87731380688.pdf
    • https://centrorevisionimonregalese.it/file/44608386843.pdf
    • http://busangh.com/attfile/fckimg/file///2021091045150_315292360.pdf
    • https://rumahbaruku.com/contents/files/59608762360.pdf
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c06983efd2---89815771916.pdf
    • https://pmeds.us/userfiles/file/24851951361.pdf
    • http://immobilieninvestors.de/userfiles/file/66953867624.pdf
    • https://nikoljski.com/ckfinder/userfiles/files/katanuzobujopowobe.pdf
    • http://tagsu.com/attachments/fckattachments/file/65033456347.pdf
    • http://uptownfallschurch.com/uploads/files/55640415257.pdf
    • http://insightonafrica.in/userfiles/file/34501927320.pdf
    • https://puntodeplacer.com/userfiles/file/zolopokafarufakerifa.pdf
    • http://grandfiltr.com/files/file/lelaxilesinewekak.pdf
    • https://sanipro.ma/app/webroot/uploaderfiles/wupadokitixo.pdf
    • https://keiba-like.biz/js/ckfinder/userfiles/files/gazotigisuparatok.pdf
    • http://bocghedanang.com/media/ftp/file/vavuk.pdf
    • https://spheresignal.com/app/webroot/userfiles/files/88667923061.pdf
    • http://gruppocreta.com/userfiles/files/63459861157.pdf
    • https://autotronics.vn/userfiles/file/77599242636.pdf
    • http://xprchemical.com/upload/files/50729808809.pdf
    • https://kientrucqhouse.com/uploads/image/files/xedubozapiruxaj.pdf
    • http://venusland.vn/app/webroot/img/files/20941044751.pdf
    • http://karinameal.ru/imgdish/files/xokaluz.pdf
    • http://breakevenpoint.pl/uploads/editor/file/kuzawul.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_off0000d5f0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD5F0 16792 bytes
font_01_sfnt_off0000ee02.bin
695861fbfa44759eda3d78f90a55e714c9249af7d50eafd2010022d517039270		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE02 17200 bytes
font_02_sfnt_off00011b38.bin
d5ad074b8c2edeafea773066dc280b3f1b952b01a14594a8ae31d88c5a9cb238		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B38 10580 bytes

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