Malicious PDF — malware analysis report

Static analysis result for SHA-256 728d33187b3a1e5e…

MALICIOUS

PDF

77.0 KB Created: 2021-09-13 16:10:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 390ad477c053506822714682e0079dac SHA-1: 6fb3dbccd938a4fbbddaaf8169b1b1197086bd4b SHA-256: 728d33187b3a1e5ea29a73bd4e4217357dd263e5546a1e635e7c536271885267
126 Risk Score

Malware Insights

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

The sample was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier returned a high malicious score. Heuristics indicate it functions as a link farm, with numerous external URIs pointing to potentially malicious PDF files hosted on disposable domains. The primary attack pattern involves directing users to these external links, likely to facilitate further exploitation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://ijfbacknumber.com/editor_up/982132600.pdf In PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ec02902c9f---10666810842.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.com/ckfinder/userfiles/files/devugedorubolixademebaze.pdfIn PDF document text
    • http://akgwealthplanner.com/crm/files/17756636246.pdfIn PDF document text
    • http://shopsuathientu.com/uploads/userfiles/file/88863449451.pdfIn PDF document text
    • https://kubermatkaplay.com/ckfinder/userfiles/files/77914044343.pdfIn PDF document text
    • http://cameralehiep.com/hinhanh_fckeditor/file/warexipanawaxuxetaf.pdfIn PDF document text
    • http://hoshitorionline.com/uploads/files/48313042994.pdfIn PDF document text
    • http://phunphu.com/userfiles/file/wamorubofokatexe.pdfIn PDF document text
    • https://jiu-hang.com/upfiles/editor/files/60634313326.pdfIn PDF document text
    • https://myvideoclasses.com/ci/userfiles/files/medarezubaxetugor.pdfIn PDF document text
    • https://holcom-wd.holcom.vn/webroot/img/files/nopavenoxuteworiwafave.pdfIn PDF document text
    • http://labsshop.com/d/files/sefedonoli.pdfIn PDF document text
    • http://stonepigments.com/userfiles/file/vekizijomitedi.pdfIn PDF document text
    • https://iieng.org/editor/ckfinder/userfiles/files/davadupulovetanexudina.pdfIn PDF document text
    • https://rintrans.com/files/48614471854.pdfIn PDF document text
    • http://av72-reklama.ru/userfiles/file/1630627008c7e1a8315717a9cdd8fd.pdfIn PDF document text
    • http://praguynakorn.com/praguynakorn/picture/datapro/files/16668777881.pdfIn PDF document text
    • http://mama-care.com/UserFiles/file/86041715008.pdfIn PDF document text
    • http://karlsbach.de/userfiles/files/39446235344.pdfIn PDF document text
    • http://zespolbahamas.pl/zdjecia/file/1691091395.pdfIn PDF document text
    • http://georgekoldun.com/var/upload/file/xipibexet.pdfIn PDF document text
    • http://kleiberit.ru/files/file/gezalebimosutod.pdfIn PDF document text
    • http://mayinmaunhat.com/upload/files/gipave.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=padmavati+free+movie+onlinePDF 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_off0000cbf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBF5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e40c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE40C 10412 bytes
SHA-256: f12344baed4489c0e8f0a3a13a4ad17589b0302076baa08bdacbc3790da4b271
font_02_sfnt_off0000fb90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB90 16944 bytes
SHA-256: 1a284438f0e295a0b970cbac517679b5ba4543bffd06cfefd7aca446ac2a8c5d

Open this report in the interactive analyzer, or submit your own file for analysis.