Malicious PDF — malware analysis report

Static analysis result for SHA-256 1167d106726e04bb…

MALICIOUS

PDF

81.4 KB Created: 2021-09-20 10:19:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e9d2569501c72c1fc51333f8f3532564 SHA-1: 6fd914721f1653dfc77a2265e43942b62fb87eca SHA-256: 1167d106726e04bb195b719f1e2fdc80cbd34801b7df219c2b1e1d25974201d4
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. The heuristic 'SE_BROWSER_INSTALL_LURE' strongly suggests a social engineering attempt to trick the user into installing malicious software or extensions. While no scripts were directly extracted, the PDF structure and embedded URLs point towards a malicious document designed to exploit user trust.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://kaemsp.org/upload/editor/file/81728968438.pdf In PDF document text
    • http://thoitrangvabaoho.com/Images_upload/files/42112835924.pdfIn PDF document text
    • http://cathugo-catamarans.de/res/wysiwyg/file/wivowox.pdfIn PDF document text
    • http://daearesort.com/FileData/ckfinder/files/20210906_BA9D9A18730D1A0F.pdfIn PDF document text
    • http://3wsystems.com/shipinc/userfiles/files/96004818695.pdfIn PDF document text
    • http://fpole.ru/sadm_files/nubupezovopoxikegufiwok.pdfIn PDF document text
    • https://r4binsh4h9-att.com/contents/files/13422093224.pdfIn PDF document text
    • https://www.pepinieres-gey.fr/ckfinder/userfiles/files/kexidakikaduzimikewuse.pdfIn PDF document text
    • http://www.frank-diagn.hu/userfiles/files/funod.pdfIn PDF document text
    • http://lica-mpt.it/userfiles/files/timupesojavo.pdfIn PDF document text
    • https://bodykneadstherapy.com.au/ckfinder/userfiles/files/nikewasikeroja.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613280c800d43---1976225755.pdfIn PDF document text
    • https://kaxtongroup.com/home5/maxconne/public_html/kaxtongroup/assets/images/newspostimages/files/dajujapo.pdfIn PDF document text
    • http://www.startservis.sk/novy/ckfinder/userfiles/files/57815726468.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16136a653e7125---84017233750.pdfIn PDF document text
    • https://tspinstruments.com/cache/fck_files/file/sagur.pdfIn PDF document text
    • https://acp-luxusingatlanok.hu/ckfinder/userfiles/files/66714335901.pdfIn PDF document text
    • http://imbirimbir.ru/files/bekoxujuzaval.pdfIn PDF document text
    • https://kligi.viart.lt/ckfinder/userfiles/files/gimivixemipe.pdfIn PDF document text
    • https://mosaicopeoplecorporation.com/ckfinder/userfiles/files/21408834194.pdfIn PDF document text
    • https://atvatextile.com/upload/ckfinder/files/nevuxajuwaf.pdfIn PDF document text
    • https://skopjemuzikon.pmgrecordings.com/ckfinder/userfiles/files/1377201107.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=unblocked+anime+websites+on+chromebookPDF 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_off0000d7eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7EB 17932 bytes
SHA-256: 8b372dca0eeaf9d7de71181a4f699f14a8813b95ab4c35e16626f7f9a1e9d713
font_01_sfnt_off0001067d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1067D 10960 bytes
SHA-256: ba322d8a6cc5e5644d97510c1525f6810a879428cf52da720611632489782e61
font_02_sfnt_off00011fc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FC4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1