Malicious PDF — malware analysis report

Static analysis result for SHA-256 85b67381a4fdf78c…

MALICIOUS

PDF

80.8 KB Created: 2021-09-12 05:07:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 57cf1dc1edaba4cfc8489f4c6cab5f29 SHA-1: 983c541f556ae364834b0cae02cc809e6103fb9a SHA-256: 85b67381a4fdf78c75e343cb0cdf680dd364bbbc23d6ec35bef1cc36bc3ec83a
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a password-protected-archive lure. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://coretry.ru/uplcv?utm_term=pdf+file+password+breaker PDF link annotation
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161393f02dc640---nesimokapajitap.pdfIn PDF document text
    • http://tecniagua.es/uploads/ckfinder/files/25476871077.pdfIn PDF document text
    • http://zjhywt.com/images/upload/File/65304801026.pdfIn PDF document text
    • https://e-ceramika.pl/userfiles/file/70109714795.pdfIn PDF document text
    • http://easyliveconstruction.com/ci/userfiles/files/17862731622.pdfIn PDF document text
    • http://immopolignano.lu/images/bidoxegumonugeragoxiwuzux.pdfIn PDF document text
    • http://king-ber.com/UploadFiles/file/20210909222733154.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161388b154bc62---21864643328.pdfIn PDF document text
    • https://www.weboonline.com/ckfinder/userfiles/files/93363107966.pdfIn PDF document text
    • https://rubyyadav.com/nbloom/fckuploads/file/17291665451.pdfIn PDF document text
    • http://thelifelesson.net/home/tappingchanges/public_html/dowalumniusa/ckfinder/userfiles/files/nuwarelovuvidu.pdfIn PDF document text
    • http://www.madiran-cruduparadis.fr/ckfinder/userfiles/files/5981364730.pdfIn PDF document text
    • http://pooq-design.com/app/webroot/fckfiles/file/ladejuzolaligu.pdfIn PDF document text
    • http://e-menu.hu/editor_up/losumajixaruf.pdfIn PDF document text
    • http://stefanourso.com/public/userfiles/file/28314677535.pdfIn PDF document text
    • https://newegys.egyseg.eu/ckfinder/userfiles/files/gokugapejuwepagazasapilin.pdfIn PDF document text
    • https://samsungklimamodelleri.com/upload/ckfinder/files/vonikedonen.pdfIn PDF document text
    • https://sausalito.com/wysiwygfiles/file/74560422948.pdfIn PDF document text
    • http://weingut-suppan.at/files/kufolepuzeki.pdfIn PDF document text
    • http://siripanyalamphun.com/user_img/files/75715418388.pdfIn PDF document text
    • https://glearningsolutions.com/userfiles/files/fasam.pdfIn PDF document text
    • http://knshzj.com/CKEdit/upload/files/5144222736.pdfIn PDF document text
    • http://www.hausman.eu/images/wyswig_images/file/gipepugusugonuwufobor.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_off0000d7d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D8 17508 bytes
SHA-256: f7472f8c6e833471551555fd4e1a9b27962134d28f23a8f7250cb3f6ea37297f
font_01_sfnt_off0001050e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1050E 10608 bytes
SHA-256: 9720ba7a9d13d21e14b9f90cea79a734fbe1f69215d03acab674d57fff023344
font_02_sfnt_off00011d42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D42 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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