Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f419c69cc615931…

MALICIOUS

PDF

81.3 KB Created: 2021-10-07 05:03:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 6df98b65b2cebbad8d032367d0915597 SHA-1: b0e5e5df5c563a712dd9cc47727d242b2c2bbac5 SHA-256: 8f419c69cc615931f0612450537455acf3faa73c9257e525a74f3dd2af1861e1
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and is flagged by ML classifiers and ClamAV as malicious. It also presents numerous external links, with one identified as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The embedded JavaScript likely facilitates the download or execution of a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://spyboarcams.com/files/64589854632.pdf In PDF document text
    • http://sportingclubalbinia.eu/userfiles/files/77382719391.pdfIn PDF document text
    • http://wtmongolia.com/materials/file/gedorirafugiwivefef.pdfIn PDF document text
    • http://jenan.com/ckfinder/userfiles/files/48423331953.pdfIn PDF document text
    • http://skoleniridicubrno.cz/ckfinder/userfiles/files/pazilomuwuxegapaduki.pdfIn PDF document text
    • https://aarhuskortet.dk/images/file/pukewekibinajovezelun.pdfIn PDF document text
    • http://bndweb.nl/upload/files/fakigunazu.pdfIn PDF document text
    • https://nguyenhungstone.com/uploads/image/files/46417794636.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614a315951677---19451762283.pdfIn PDF document text
    • http://ecogestval.com/userfiles/file/kunomemuduwol.pdfIn PDF document text
    • http://hokkaido-love87.com/app/webroot/js/ckfinder/userfiles/files/bexuwusinokavatejikotasaf.pdfIn PDF document text
    • https://capitolmodels.tuzonanet.net/userfiles/file/9195578545.pdfIn PDF document text
    • https://capital-publishing.com/ckfinder/userfiles/files/pifukogejajulusojiw.pdfIn PDF document text
    • http://artvideo74.ru/upfiles/files/78966476527.pdfIn PDF document text
    • http://cobe-ing.it/userfiles/files/8076937804.pdfIn PDF document text
    • https://mobile-translator.eu/app/webroot/media/files/xinedinafafixoxewir.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/warosedobap.pdfIn PDF document text
    • http://seattlebestteriyaki.com/uploads/files/13189540288.pdfIn PDF document text
    • https://yaslibakicisi.net/userfiles/file/73804497649.pdfIn PDF document text
    • http://krukaiart.com/userfiles/files/tiladofobadexix.pdfIn PDF document text
    • https://bagstyle.uz/images/file/wikirerodunotigejudu.pdfIn PDF document text
    • http://petukmahaaaraj.com/userfiles/file/55590422970.pdfIn PDF document text
    • http://encino.kopanramen.com/uploads/files/lowodofe.pdfIn PDF document text
    • http://lmalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zunusaxew.pdfIn PDF document text
    • http://www.pilartangguh.com/file/81349077404.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=tamil+dubbed+dhoom+2+movie+downloadPDF 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_off0000d637.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD637 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE4E 10620 bytes
SHA-256: 24acfee046b90b3ffab48f39a911ed03db58d6aec9a02a287414aff64f0d9ed1
font_02_sfnt_off0001065e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1065E 19228 bytes
SHA-256: 1dbfc0840f48c594e17a7e3cfcb2106708d6dd5664c95dfc0bf62337d4b861be