Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb6245901e90353a…

MALICIOUS

PDF

80.0 KB Created: 2021-09-15 09:19:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 640ad5c826360ea357551fb7c4cb9403 SHA-1: 6e0f120f22e3fb4f2c52cd411b357e2582779ac8 SHA-256: eb6245901e90353a0ee936f07d66b3668992e708a4fa98a2d856dace5e5b31f8
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to external domains, many of which are structured as link farms or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the PDF is designed to host many links on potentially untrusted domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8329

Heuristics 5

  • 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.
  • 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://smidgel.ru/uplcv?utm_term=how+to+send+files+from+iphone+to+macbook+via+bluetooth PDF link annotation
    • http://cobe-ing.it/userfiles/files/81255559797.pdfIn PDF document text
    • http://veterky.ru/ckfinder/userfiles/files/8230485759.pdfIn PDF document text
    • http://edmo-cars.nl/images/file/4313440039.pdfIn PDF document text
    • https://supportsystemsvainc.com/home/ssvi/public_html/ckfinder/userfiles/files/36570366120.pdfIn PDF document text
    • https://tepihtrava.rs/files/18547181026.pdfIn PDF document text
    • http://bestofbeer.ru/ckfinder/userfiles/files/82899308217.pdfIn PDF document text
    • http://5thaveseniors.org/userfiles/file/fiwimetezurabipiz.pdfIn PDF document text
    • http://mastera-mix.ru/ckfinder/userfiles/files/95297193738.pdfIn PDF document text
    • https://inprovitargentina.com/ckfinder/userfiles/files/lamaxumibidadake.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021091308263946.pdfIn PDF document text
    • http://charontrade.hu/data/file/10902686195.pdfIn PDF document text
    • http://thekitchendesignstudio.org/uploads/files/lutitazitokepojefedab.pdfIn PDF document text
    • http://yameitecl.com/ckfinder/userfiles/files/20210912_194525.pdfIn PDF document text
    • http://alfatreyd-mebel.ru/archive/images/file/javiwerubasobanigenasikim.pdfIn PDF document text
    • http://sweethomedelivery.com/ckeditor/ckfinder/core/connector/php/uploads/files/waxipupepitiw.pdfIn PDF document text
    • http://mid-europe-ex.com/images/blog/file/90088261774.pdfIn PDF document text
    • https://www.db-ynox.fr/ckfinder/userfiles/files/varevimejokogup.pdfIn PDF document text
    • http://atel-j.nl/uploads/files/muvub.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/313b005d5f4afa6b91b4609bf8c1ad23/52247130358.pdfIn PDF document text
    • https://chsins.tw/uploads/files/202109040811521195.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/39726009935.pdfIn PDF document text
    • https://hockeymro.ca/docs/file/jowufibotemaluduvutulu.pdfIn PDF document text
    • http://myphamasia.net/upload/files/48599243415.pdfIn 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_off0000d980.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD980 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f197.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF197 11360 bytes
SHA-256: 304b3a2f2428047044eb765283ce1f2e09a9c72eb0a205ea653d1667e3e251f3
font_02_sfnt_off00010bea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BEA 18272 bytes
SHA-256: ee9a2c02fea750f0edc258dfe0e479968d8a90e5a50c07cc893b642ead241c9f

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