Malicious PDF — malware analysis report

Static analysis result for SHA-256 92c3456114537416…

MALICIOUS

PDF

84.8 KB Created: 2021-09-17 15:51:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4dabcc61ffa2c7fb56e8148c3459c1f8 SHA-1: 098306e57c304797189ffbf75a80d0159f2babbc SHA-256: 92c345611453741685afb36b72136385cfa27a633020751c04a9b59c2fac0060
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which are part of link farms designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high likelihood of malicious intent, aiming to obscure the final destination of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://huntic.ru/uplcv?utm_term=android+1+gta PDF link annotation
    • http://jerseybankruptcylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/95203585484.pdfIn PDF document text
    • https://taipeitccia.org/CKEdit/upload/files/zusifavejinatoruguwi.pdfIn PDF document text
    • https://cahayaapi1.com/contents/files/13390278891.pdfIn PDF document text
    • https://simondaulte.com/ckfinder/userfiles/files/7703135947.pdfIn PDF document text
    • https://hoatuoi360.vn/uploads/files/41251263374.pdfIn PDF document text
    • https://vr-spagna-20.effievirtual.com/galeria/files/vobedujivub.pdfIn PDF document text
    • http://appartenvue.net/appart/upload/images/45654998604.pdfIn PDF document text
    • https://www.groupe-coelho.fr/ckfinder/userfiles/files/82577929965.pdfIn PDF document text
    • http://kidneytracker.com/ckfinder/userfiles/files/11667600183.pdfIn PDF document text
    • https://togeltop.net/contents/files/wiwutofimisomiriduzuso.pdfIn PDF document text
    • http://bezpiecznamlodosc.org/files/file/58967146450.pdfIn PDF document text
    • http://reopen911.info/media/file/tibarutoparejoxuberoreloj.pdfIn PDF document text
    • http://moiarchitekci.pl/pliki/file/84950433957.pdfIn PDF document text
    • http://cartopack.be/Images/file/40663555563.pdfIn PDF document text
    • http://global-leasing-management.com/uf/file/15383759563.pdfIn PDF document text
    • http://www.coverseg.com/uploads/ckfinder/files/28994658468.pdfIn PDF document text
    • https://krantiservice.com/ckfinder/userfiles/files/66099348092.pdfIn PDF document text
    • http://kengosushionlineorder.com/uploads/files/9740853563.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1614142d95b7ee---rugidomasumekuj.pdfIn PDF document text
    • http://boatmonies.com/uploads/files/99307833820.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_off0000eaa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA1 17380 bytes
SHA-256: b7e705ac75cf386544b94e5841f7647ac2eada2ddbdf0a7525b2c54ec1764d1a
font_01_sfnt_off000117aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117AA 10112 bytes
SHA-256: c48c793f7a4485994e44727c9c969c4ad66e0f9c3b2dacea316594f9fedea139
font_02_sfnt_off00012e27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E27 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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