Malicious PDF — malware analysis report

Static analysis result for SHA-256 620a5fd774fc92cc…

MALICIOUS

PDF

96.3 KB Created: 2021-09-18 03:06:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4827a06e711bce2bc8c888ad13c4a3b5 SHA-1: 5ba8b0f4bd43b190c86015945dfeac1eb1d355cd SHA-256: 620a5fd774fc92cc523da0fc099f4ffe25c73728fcf6f3bc1ff9f4509a386ca9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, suggesting a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a large number of links on potentially untrusted domains, likely to obscure the final malicious destination or to appear as legitimate content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://smidgel.ru/uplcv?utm_term=galaxy+s3+android+version+update PDF link annotation
    • http://kppzp.pl/userfiles/file/23120539647.pdfIn PDF document text
    • http://hublihorse.com/uploads/userfiles/files/52632520593.pdfIn PDF document text
    • http://holdemigny.fr/ckfinder/userfiles/files/fegovepopefajokunudovoz.pdfIn PDF document text
    • https://cremyco.com/app/webroot/docs/file/kowamap.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/89144286839.pdfIn PDF document text
    • http://vita24h.com/uploads/userfiles/file/modobiponid.pdfIn PDF document text
    • http://fantasymusic.it/userfiles/files/disaninadivisuvatowa.pdfIn PDF document text
    • http://haiannweb.com/uploads/files/xosogikosi.pdfIn PDF document text
    • https://motoquadro.de/userfiles/file/topenilelelasiretuwu.pdfIn PDF document text
    • http://vietkinggroup.com/uploads/userfiles/file/44275348121.pdfIn PDF document text
    • http://aroma-es.site/yamituki-n/uploads/files/tubavudopufadelunodedebu.pdfIn PDF document text
    • https://iieng.org/editor/ckfinder/userfiles/files/25744577663.pdfIn PDF document text
    • https://alley.52886.tw/uploads/files/70821687530.pdfIn PDF document text
    • https://ddshower.com/ckfinder/userfiles/files/45404685145.pdfIn PDF document text
    • http://launensia.cz/ckfinder/userfiles/files/97471554434.pdfIn PDF document text
    • https://rosenstein.lu/userfiles/files/39270122934.pdfIn PDF document text
    • http://buyyoutubecomments.com/ci/userfiles/files/62142029887.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614109ecba4d9---gezalebevoxidipuzix.pdfIn PDF document text
    • http://balassalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/62119088271.pdfIn PDF document text
    • http://ordineveterinarireggioemilia.it/userfiles/files/vobot.pdfIn PDF document text
    • http://romanasulcikova.cz/userfiles/wedagevepazex.pdfIn PDF document text
    • http://tokyosushilohaus.com/uploads/files/foloranowe.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_off00011582.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11582 17000 bytes
SHA-256: 8e1608a126a08286ac5d2febd7f4e40b62b6b5c58feefb4a474604d2094103fc
font_01_sfnt_off000141c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141C7 10976 bytes
SHA-256: cf48ba540bcda5d8f131a705e0e661cf67b7532f1bcf471127ee703666d61d32
font_02_sfnt_off00015b7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B7E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.