Malicious PDF — malware analysis report

Static analysis result for SHA-256 9deeac1af5ce65c1…

MALICIOUS

PDF

75.5 KB Created: 2021-09-29 06:58:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 3b1cda01e22c7160377792bf6c20c277 SHA-1: c5c254eb288e2e735b64d3c403978fac0420282f SHA-256: 9deeac1af5ce65c1a0eccad73cea69f029e1e2c0e9ef6e1b7e841425126d7a73
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are likely used for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links suggest a common pattern of luring users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://chcial.ru/uplcv?utm_term=black+hole+high+watch+online PDF link annotation
    • https://digireg.se/upload/lexososuwaxubig.pdfIn PDF document text
    • http://positiveforce.in/uploads/files/sonoseguduzasek.pdfIn PDF document text
    • http://kite-surf.sk/files/lenof.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/1614ae6358cd67---7523317391.pdfIn PDF document text
    • http://vitrine-prof.com/files/nutesovadewimowixureketor.pdfIn PDF document text
    • https://www.ewdel.cz/ckfinder/userfiles/files/jikawovurelupunuxa.pdfIn PDF document text
    • http://firmykominkowe.pl/Obrazki/edytor/file/32349257170.pdfIn PDF document text
    • http://full814.com/upload/files/54038313252.pdfIn PDF document text
    • https://casabresciani.it/uploads/file/53785032332.pdfIn PDF document text
    • http://fizjoactiv.eu/Upload/file/wepiberuwisipomixo.pdfIn PDF document text
    • https://epponline.com/mentorfinancial/page_images/file/tetivolemuj.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/13e8c12eb3ec417dcfb9300c67f8e7bf/veramuji.pdfIn PDF document text
    • http://anninh247.info/upload/files/vifuzibewilonavajunagaruw.pdfIn PDF document text
    • http://ubest.ru/images/file/bifizivemupewagidefojef.pdfIn PDF document text
    • http://roberlo.cz/www/files/file/63011505862.pdfIn PDF document text
    • http://sxhk365.com/uploads/file///7466206912.pdfIn PDF document text
    • http://kiuruvedenlukio.fi/tiedostot/file/34374688318.pdfIn PDF document text
    • http://yao-cheng.com/uploadfiles/20210906025829.pdfIn PDF document text
    • http://synerfreight.com/syner_upload/images/files/78454571653.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/70035852979.pdfIn PDF document text
    • http://eiak.org/upload/editor/files/potoraguworiduwo.pdfIn PDF document text
    • https://businesslife.com/content/files/piretevux.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_off0000bdfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDFC 18972 bytes
SHA-256: 70ec6b78e06398318714b726ff80b499b5df849e14fb1fe63b7bee414a8f97f5
font_01_sfnt_off0000eeea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEEA 10472 bytes
SHA-256: 29ae1c9ffb3763c4225e283daefdfff899b8981e836483303ff14350bd0e2ebe
font_02_sfnt_off000106c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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