Malicious PDF — malware analysis report

Static analysis result for SHA-256 37f678ade25a2076…

MALICIOUS

PDF

79.7 KB Created: 2021-09-18 21:56:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9964d947a177bbaca45e69822d70e3f6 SHA-1: a8fd10b6f8c1aa27fa76316ecf70b7d27e4d68c0 SHA-256: 37f678ade25a2076546bb66c621ebecfc28ad43022b4be1ec99a1f3fe47d0fab
134 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript which is a common technique for executing malicious actions. The ML classifier and ClamAV detection strongly indicate malicious intent. The JavaScript likely redirects the user to one of the numerous embedded URLs, such as 'https://dammesliepas.lv/ckfinder/userfiles/files/28253039999.pdf', which is a typical phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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.
  • JavaScript action low PDF_JAVASCRIPT
    PDF contains a /JavaScript action. 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://dammesliepas.lv/ckfinder/userfiles/files/28253039999.pdf In PDF document text
    • http://guides2alpes.fr/uploads/file/roxemeboxutilonedemerugu.pdfIn PDF document text
    • http://www.fishandcosolicitors.com/uploads/files/76303882125.pdfIn PDF document text
    • https://ksboutlet.com/file/files/rarisuxanufiwugosirumex.pdfIn PDF document text
    • http://mcap.cz/images/uploadedimages/file/98768400972.pdfIn PDF document text
    • http://sportsgarten.com/editorData/file/23789914491.pdfIn PDF document text
    • http://tramtronbetong.com/uploads/userfiles/file/dufive.pdfIn PDF document text
    • https://roofmed.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16141452bd28cb---37790422132.pdfIn PDF document text
    • http://ekogamma.pl/javascript/ckfinder/userfiles/files/1568241968.pdfIn PDF document text
    • http://vako.vn/app/webroot/uploads/files/40068961721.pdfIn PDF document text
    • http://restaurant-lyons.fr/userfiles/file/35515354482.pdfIn PDF document text
    • http://veterky.ru/ckfinder/userfiles/files/55711109149.pdfIn PDF document text
    • https://nordavril.com/userfiles/file/tadejovuwowiwopun.pdfIn PDF document text
    • http://newcityhk.com/userfiles/58454512585.pdfIn PDF document text
    • http://khachsanmyngoc.com/upload/files/tedelina.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613005592e40e---poponusi.pdfIn PDF document text
    • http://abaj.cz/UserFiles/File/60469184999.pdfIn PDF document text
    • http://df-2.de/images/daten/file/76979076953.pdfIn PDF document text
    • https://goacetours.com/ckfinder/userfiles/files/81955489917.pdfIn PDF document text
    • http://bagumul.com/file_upload/spaw_upload/file/20210911000952.pdfIn PDF document text
    • http://hz-kontejnery.cz/ckfinder/userfiles/files/zuwerisoromudinimeruw.pdfIn PDF document text
    • http://brain-sh.tw/upload/file/nefomimenetuzuwu.pdfIn PDF document text
    • https://tsegypt.com/file/jasikose.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=how+can+i+save+my+text+messages+on+my+android+phonePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d27d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD27D 11272 bytes
SHA-256: 5872f7a3be6ff30b41b821197f548304f12069b6a9729aaf30fea220cc635cf3
font_01_sfnt_off0000eca2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECA2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000104b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104B4 17204 bytes
SHA-256: 2a278e937cd229458c4f27b4fcc804fab382a7769d6f9e2598e9c222f3b91586

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