Malicious PDF — malware analysis report

Static analysis result for SHA-256 5215e95f3aed5193…

MALICIOUS

PDF

77.3 KB Created: 2021-09-13 17:02:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 742dde985f5049307db5b5ef5ca0c879 SHA-1: 7ed1e143c9f9638d965640854a472f65e0e12fed SHA-256: 5215e95f3aed519384f2b2f58bc61cee079641a92f6a057a355e16435729518a
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a large number of external URIs, many of which are part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://crewmak.ru/uplcv?utm_term=jd+samson+sia PDF link annotation
    • http://leaguengn.com/userfiles/file///7406932031.pdfIn PDF document text
    • http://boschvietnam.com/files/usersfiles/files/pewaxagujireguw.pdfIn PDF document text
    • http://01host.ru/userfiles/files/75534045053.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139bb42d11c6---83322912467.pdfIn PDF document text
    • http://cetis156.neutronds.com/assets/js/ckfinder/userfiles/files/zisexasepex.pdfIn PDF document text
    • https://eastmangroupllc.net/ckfinder/userfiles/files/75546480757.pdfIn PDF document text
    • http://chhattisgarhsanskritboard.in/sharpinstitute/images/files/85048618440.pdfIn PDF document text
    • http://www2.grupoksl.com.br/js/ckfinder/userfiles/files/9653963949.pdfIn PDF document text
    • https://dollarplus98.com/images/upload/files/bovidevajoritib.pdfIn PDF document text
    • https://beysukonaklari.com/ckfinder/userfiles/files/93499025540.pdfIn PDF document text
    • http://maimungkorn.com/UserFiles/file/49404705390.pdfIn PDF document text
    • https://psiakocky-potisk.cz/webpagebuilder/ckfinder/userfiles/files/zazemujobiki.pdfIn PDF document text
    • http://aquitaine.annuaire-regional.com/ckfinder/userfiles/files/73101879420.pdfIn PDF document text
    • http://dataction.org/demo/dataction/media/sipepubugewi.pdfIn PDF document text
    • https://serviceservice.eu/userfiles/file/loreraxekalolo.pdfIn PDF document text
    • http://www.jysunshine-hotel.com/up_files/file/taregu.pdfIn PDF document text
    • https://fertilizerproductionprocess.com/d/files/rijid.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/xufepozibuke.pdfIn PDF document text
    • http://saipanbooking.com/FileData/ckfinder/files/20210906_448AF83A46F950CC.pdfIn PDF document text
    • http://dhleisure.com/ckupload/files/boxewegideme.pdfIn PDF document text
    • http://akiisushi.com/uploads/files/fekakewigakel.pdfIn PDF document text
    • https://s-oil.hoakhanh.vn/uploads/image/files/35837491081.pdfIn PDF document text
    • http://dreamwith.gni.kr/ckupload/files/84769037521.pdfIn PDF document text
    • 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_off0000c8c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8C8 10024 bytes
SHA-256: 32c25713063a583e13e176f3c241b8662e3920afc7f762e51baefa013790b54e
font_01_sfnt_off0000def0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f702.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF702 18724 bytes
SHA-256: 5732ddca64d906cc53e259b97796ae972356da2940f56c87dfe661da5c7c7858

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