Malicious PDF — malware analysis report

Static analysis result for SHA-256 817434e2b124eb61…

MALICIOUS

PDF

80.7 KB Created: 2021-09-18 20:22:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0c196385a630feb39e2e22c42b563630 SHA-1: bf3e560cc1054b71f8fb35e8eadd21de808f71ed SHA-256: 817434e2b124eb6114b99704a2c2a322d40b62480be5d2d3e2f3d8acae3e603b
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The ML classifier and ClamAV detection strongly indicate malicious intent. The numerous external URLs, many hosted on potentially compromised or disposable domains, suggest a phishing or malware distribution campaign. The embedded JavaScript likely facilitates the redirection to these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://kop-trans.pl/uploads/userfiles/files/dafibefagivurepuma.pdf
    • http://winfielddeli.com/ckfinder/userfiles/files/vitirolosupagop.pdf
    • http://highendschmiede.de/highendfiles/file/bufujakasovakepabox.pdf
    • http://48bulls.com/js/upload/files/18687313309.pdf
    • http://absolutelyneon.com/userfiles/file/vaminur.pdf
    • http://standardamulet.com/files/files/92739423982.pdf
    • http://esejsc.com/upload/files/zumedaluwujof.pdf
    • http://lionsmarsala.it/userfiles/files/luserovixobakipa.pdf
    • http://riviera.az/userfiles/file/gisafobukogapuxojixujo.pdf
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/16133a92fc64a3---84182146317.pdf
    • https://52fantasies.com/home/holly/public_html/ckfinder/userfiles/files/tosemixifibopete.pdf
    • https://actorconseil.com/files/file/zegosugezaduwerafax.pdf
    • http://xn----7sbezcba9a5aggb3j.xn--p1ai/ckfinder/userfiles/files/89707396135.pdf
    • http://sxsasa.org/images_fck/file/1631736718.pdf
    • https://butagallery.com/userfiles/files/nijini.pdf
    • http://agenziaimmobiliarecannavo.eu/userfiles/files/88958581570.pdf
    • http://kuehllawpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/subabalediwigavivegasav.pdf
    • http://xedaphcm.com/luutru/files/polobuvigidedokumot.pdf
    • http://fullx.net/files/17570065842.pdf
    • http://szyqjsj.com/UploadFile/file/20210917065905067.pdf
    • http://wwpokebar.com/uploads/files/22906333702.pdf
    • https://perfecthospitals.org/FCKeditor/file/pezifetejoxuv.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=why+the+apps+are+not+downloading+from+play+store
    • 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_off0000d594.bin
5ebc49644dd3018ebb9c6207e72a8c770196877c44afd8fa03c128cd75a7c389		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD594 18212 bytes
font_01_sfnt_off000103cc.bin
92395fcb88afcf27dd358f3646fe29231f4d4ad22cfcd4e698dea25607ea4379		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103CC 11140 bytes
font_02_sfnt_off00011d79.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11D79 16792 bytes

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