Malicious PDF — malware analysis report

Static analysis result for SHA-256 83550f89fa11914f…

MALICIOUS

PDF

73.3 KB Created: 2021-09-28 08:51:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 07d8616ec228c0fd9ab1ae8e85644f63 SHA-1: 819e931bc389b1b438661f5f1aa0c2e1f05985ec SHA-256: 83550f89fa11914fd376431d9687a8d518acb0a5ebc4d674af0fb53de0255acc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, with one specifically mentioning 'download latest cash app apk' in its query parameters, suggesting a phishing lure. The PDF's structure and the presence of multiple external links, some pointing to potentially disposable domains, indicate it's designed to redirect users to malicious content. ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://csc0851.com/userfiles/file/20210904190829_a8dgpn.pdf
    • http://okna-kursk.ru/page_edit/_samples/userfiles/files/8981585709.pdf
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/hcklhaofaruvig4aeittak3ep1/xekixezemigala.pdf
    • http://gpkoaee.ru/ckfinder/userfiles/files/80383318197.pdf
    • http://qigong.ru/userfiles/file/11845400306.pdf
    • http://madiran-cruduparadis.fr/ckfinder/userfiles/files/22286678681.pdf
    • http://webcertain.net/contentupload/fckeditorUploads/organization_/file/bulagupukutu.pdf
    • http://www.ondebiz.com/userfiles/file/77518873580.pdf
    • https://soechi.net/userfiles/file/sixejaxuk.pdf
    • https://amatnieks.lv/pictures/image/37546641229.pdf
    • https://globalathena.com/ckfinder/userfiles/files/72641305623.pdf
    • https://pachetedeturism.ro/images/files/xugigogatajosixurubupon.pdf
    • http://sinice-rasy.cz/files/file/71650095029.pdf
    • http://campfirewtx.org/userfiles/file/74601393002.pdf
    • http://cck-brno.cz/ckfinder/userfiles/files/51524661089.pdf
    • http://020tzs.com/baige/images/userfiles/file/fizitademajimokuxakipelin.pdf
    • http://www.bandungmesin.com/file/51565308843.pdf
    • https://hotlinepro.in/admin/userfiles/file/62607443522.pdf
    • https://enilubricantvn.hoakhanh.vn/uploads/image/files/7340489008.pdf
    • http://www.investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/wuvuvarogaxafobowaz.pdf
    • http://zjhywt.com/images/upload/File/zebokokobujejarabosuma.pdf
    • http://aaz.sk/editor_uploads/files/26465047468.pdf
    • http://robertfeinberglaw.com/images/edit_images/file/8274871348.pdf
    • https://oddluzanie.net/userfiles/file/55076821292.pdf
    • http://ryukatsu.com/userData/board/file/16107793333.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=download+latest+cash+app+apk
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b7c5.bin
0df78a37486395228fbcd150f5c5094c9b9146d496ec15c56b93b98c51228c7f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB7C5 18368 bytes
font_01_sfnt_off0000e78a.bin
39beb6f6af3946ebafdeb190b7ce4c7c24129e91eec2272f09e18b13d668e998		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE78A 10600 bytes
font_02_sfnt_off0000ffcd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFFCD 16792 bytes

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