Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c4f0def4d7b3c40…

MALICIOUS

PDF

73.6 KB Created: 2021-09-17 01:56:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9ab85b80e4a9aa4d38822d5ab7be0cc3 SHA-1: 2cb1de8c18fac74d0782074bbc82b9451f75a7a4 SHA-256: 7c4f0def4d7b3c401d1d9f31900321114e1d253d20c98df736c48d3f72a928ce
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it's a link farm and a social engineering lure to install browser updates. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious sites, potentially for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://bukharaatlanta.com/sites/default/files/file/5843335075.pdf In PDF document text
    • http://togclick.com/media/userFckfiles/file/dejebu.pdfIn PDF document text
    • https://ontogepszerviz.hu/editor_up/57910335299.pdfIn PDF document text
    • http://myconnect-thailand.com/image/upload/File/pusonagisowunuvipexe.pdfIn PDF document text
    • http://phukhoabacninh.com/images/files/7124747148.pdfIn PDF document text
    • https://calendarsunrooms.com/userfiles/files/ropirovupiwenenilibozimat.pdfIn PDF document text
    • http://terredellamagnagrecia.com/userfiles/files/jufawogapukowifigop.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/161308f32f2651---99186077566.pdfIn PDF document text
    • https://deycaterers.com/ckfinder/userfiles/files/25367741135.pdfIn PDF document text
    • http://benetalent.com/upload/files/41678948702.pdfIn PDF document text
    • http://www.espaciocultivarte.com/ckfinder/userfiles/files/wamuvozojufamumom.pdfIn PDF document text
    • http://e68momo.com/shopadmin/upload/files/54129801362.pdfIn PDF document text
    • http://serdceprirody.ru/userfiles/file/xefitopezeguga.pdfIn PDF document text
    • http://clubselectionvoyages.net/images/file/7132095898.pdfIn PDF document text
    • https://nffcd.org/userfiles/files/1059037493.pdfIn PDF document text
    • https://presentkompaniet.com/img/content/file/85582673242.pdfIn PDF document text
    • http://ladyqueen.it/userfiles/files/pasoz.pdfIn PDF document text
    • http://szintai.hu/ckfinder/userfiles/files/jeduna.pdfIn PDF document text
    • http://gzhangqin.com/uploadfile/files/renesipevobewulenuxuva.pdfIn PDF document text
    • http://zatacorp.com/upload/files/vofagesutufi.pdfIn PDF document text
    • http://theponghop.com/upload/files/murijowitatilobosife.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/kq43gksaavffcbg0tj8rkhd104/16254444407.pdfIn PDF document text
    • http://dblbtech.com/userfiles/file/55514972986.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/56547732427.pdfIn PDF document text
    • http://nextlab-semi.com/files/fckeditor/file/97184987399.pdfIn PDF document text
    • http://caudafotografia.com/userfiles/files/54178295710.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=logo+intro+maker+mod+apkPDF 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_off0000be1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE1B 16572 bytes
SHA-256: 96b2d019d2e1faf2279c08053f900275ee67aad877c9fe4a9d0a5a3bd787d26b
font_01_sfnt_off0000e8e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E5 10568 bytes
SHA-256: 977edda382f9bd1ff9d2cf54c4f72c088970b1e9089d6944cafc84e18727216e
font_02_sfnt_off000100be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1