Malicious PDF — malware analysis report

Static analysis result for SHA-256 8805b754b36b2724…

MALICIOUS

PDF

81.8 KB Created: 2021-09-11 08:03:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 0db675b9b3a961d41e2996a66548de30 SHA-1: b045463335b1fd979e94cd71a7d541de3bfcd154 SHA-256: 8805b754b36b27242fadabfea7d28af03600396bcf52d3402522c5e82b138b6e
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm, indicating a malicious intent to redirect users. The ML classifier and ClamAV detection strongly suggest this PDF is malicious, likely a phishing lure or a downloader. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of techniques used to deliver malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://geodavidepini.it/userfiles/files/gipadelijuxugefumukazubef.pdf In PDF document text
    • http://rydelko.pl/userfiles/file/linafipasisawarema.pdfIn PDF document text
    • http://coutleelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/segapesi.pdfIn PDF document text
    • http://wpklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/punezororurojabe.pdfIn PDF document text
    • https://flims.atelierleuthold.ch/userfiles/files/kaxotiwesa.pdfIn PDF document text
    • http://grandinhr.eu/images/user/file/bosijix.pdfIn PDF document text
    • http://fanti-fitness.pl/uploads/assets/file/dabusamirigeriwitife.pdfIn PDF document text
    • https://medtek.vn/storage/file/xudedamidapivuj.pdfIn PDF document text
    • http://alliance-ic.ru/uploads/file/musoguzuwigodadi.pdfIn PDF document text
    • http://lorichphoto.com/pictures/file/58432690057.pdfIn PDF document text
    • http://laskod.hu/userfiles/file/soburepevukevi.pdfIn PDF document text
    • http://xsteelstock.com/d/files/17376120591.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131721e7a013---nizigatipugibuvagifunuwi.pdfIn PDF document text
    • https://watertorens.nl/userfiles/file/vobiribudaw.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/161337ad38be5d---37089464839.pdfIn PDF document text
    • https://winpoasia.com/ckfinder/userfiles/files/tiwunigokifalazal.pdfIn PDF document text
    • http://yogathoitrang.com/quangbasanpham/app/webroot/upload/image/files/71063914820.pdfIn PDF document text
    • http://etalentlink.com/uploadfile/file///2021090518103467.pdfIn PDF document text
    • http://advairtech.eu/assets/userfiles/file/13090190095.pdfIn PDF document text
    • http://dtmaso.com/public_html/Imagens/file/81874095429.pdfIn PDF document text
    • https://jaukiaplinka.lt/ckfinder/userfiles/files/36701448261.pdfIn PDF document text
    • http://autodilygood.cz/files/file/17488740886.pdfIn PDF document text
    • http://www.galiantsolutions.com/emailimages/file/6705299842.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=free+app+to+check+instagram+stalkersPDF 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_off0000db21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB21 17556 bytes
SHA-256: cc08f356c044931153987a0762c19df39d005ea10ea821d592bc31115117a3db
font_01_sfnt_off000108a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108A5 10892 bytes
SHA-256: 0e3c2c0ea00deac2054f3843d8ac14b38a757d1afe0f76c7faa563adb345271f
font_02_sfnt_off0001219d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1219D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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