Malicious PDF — malware analysis report

Static analysis result for SHA-256 77a7e4a180053c8c…

MALICIOUS

PDF

80.6 KB Created: 2021-10-20 08:08:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 852af07df93d26e5596b46d441604776 SHA-1: f19444598e762b8fa1ff95ac496a651b81f5eb34 SHA-256: 77a7e4a180053c8cfb6bbd8b8a9d88575e620e6254a9cc3a931a931790277a2e
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on disposable domains and appear to be part of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://autowagon.it/userfiles/files/71894068075.pdf In PDF document text
    • https://shoppingplanet.cityplanet.ro/ckfinder/userfiles/files/9384244989.pdfIn PDF document text
    • http://xahscw.com/userfiles/file/93277592283.pdfIn PDF document text
    • http://dongduong.net/Images_upload/files/40879464858.pdfIn PDF document text
    • http://brenderup.ro/mm/file/31026775448.pdfIn PDF document text
    • http://dailygameresult.com/editor/UserFiles2/files/47775666013.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/16145f03655972---majerimopidizawudofo.pdfIn PDF document text
    • http://ambulatorioveterinariosantanna.eu/userfiles/files/79712634166.pdfIn PDF document text
    • http://pandoraecza.com/genelresimler/file/guratowozokemalokasoduva.pdfIn PDF document text
    • http://speakingaboutnetworking.com/ckfinder/userfiles/files/bazapane.pdfIn PDF document text
    • https://eminencesolutions.in/resources/userfiles/file/19567756563.pdfIn PDF document text
    • http://cityclick.it/userfiles/files/92323476717.pdfIn PDF document text
    • http://pazarziraat.com/userfiles/file/jebozijewivozafodu.pdfIn PDF document text
    • https://www.speeddating.lt/speeddating/ckfinder/userfiles/files/75127607628.pdfIn PDF document text
    • http://kxqcgs.net/filespath/files/20211015021610.pdfIn PDF document text
    • https://goldgreiner.de/userfiles/file/89943837943.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/2e3135077764f1fb43e76b8e241a7448/borotaxe.pdfIn PDF document text
    • http://connect-event.fr/ckfinder/userfiles/files/50387400146.pdfIn PDF document text
    • http://idealhca.com/admin/images/file/6588665324.pdfIn PDF document text
    • https://horgaszvelem.elelmiszer-hazhozszallitas.hu/ckfinder/userfiles/files/57954585549.pdfIn PDF document text
    • https://gppacdatabase.net/userfiles/file/54162024600.pdfIn PDF document text
    • https://bem-sa.com/img/file/gugagib.pdfIn PDF document text
    • https://kovrdom.ru/sites/all/sites/default/files/file/18188406520.pdfIn PDF document text
    • https://cingenito.ca/upload/editor/file/6585234943.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/6Zflnl449io/uplcv?utm_term=programming+python+powerful+object-oriented+programming+pdf+githubPDF 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_off0000d5b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5B7 11504 bytes
SHA-256: 68a946f2425b8e71480eaf948c6aa3b7916d2ac1bd5f01615ed86a086621c0a5
font_01_sfnt_off0000f06c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF06C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001087e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1087E 17028 bytes
SHA-256: 6f036bb8ed1a29c3aad5109753fdb9385fb3d63c2253537d73b596cb9ece3b2b