Malicious PDF — malware analysis report

Static analysis result for SHA-256 be7f6f9edbca23a4…

MALICIOUS

PDF

89.5 KB Created: 2021-09-23 15:17:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d7d434927e4bfac5178c6b20daf5c625 SHA-1: 59e3394bbf7defba668db63e336649f2defb8a8d SHA-256: be7f6f9edbca23a4e9039fb26e40edc8ea39a7b48ad01e4953a25530499dfd2a
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1071.001 Web Protocols

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm on disposable hosting. The primary URL suggests a lure related to a 'flash player android' update, indicating a phishing attempt to trick users into downloading a malicious file. The ML classifier and ClamAV detection strongly support the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://allytemp.ru/uplcv?utm_term=flash+player+android+2020 PDF link annotation
    • https://sporyolu.com/resimler/files/57802542088.pdfIn PDF document text
    • http://vervesimuhub.com/userfiles/file/bofij.pdfIn PDF document text
    • http://ibarugi.com/fckeditor/userfiles/file/22916664203.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/21569300038.pdfIn PDF document text
    • http://molenat-energies.fr/molenat.com/images/editor/file/jigudagadosinamabavu.pdfIn PDF document text
    • http://elitk.ru/_files/lozuxaxomukapozogepijos.pdfIn PDF document text
    • https://bhavanarayanaswamy.org/userfiles/file/35153474567.pdfIn PDF document text
    • http://ikuma-car.com/js/upload/files/88921415699.pdfIn PDF document text
    • https://giorgiosantinelli.it/file/23990948238.pdfIn PDF document text
    • http://www.syrahresources.com.au/application/third_party/ckfinder/userfiles/files/85084602837.pdfIn PDF document text
    • http://www.euro-fly.eu/userfiles/files/68653686091.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/82197377995.pdfIn PDF document text
    • http://topenglish.sk/app/webroot/gallery/files/47167817305.pdfIn PDF document text
    • http://smart.sut.ac.th/tsme/src/lib/ckfinder/userfiles/files/87903999949.pdfIn PDF document text
    • https://ctners.com/ckfinder/userfiles/files/jegimememategi.pdfIn PDF document text
    • http://risorsaterra.it/userfiles/files/77924782127.pdfIn PDF document text
    • https://dukra.sk/editor_uploads/files/64420185226.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/eppln9k0qcuums3utghp9sfgah/58781100950.pdfIn PDF document text
    • https://armature.ir/cache/fck_files/file/maxodimafawijijirupopuga.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f5425ae5cf---50404808320.pdfIn PDF document text
    • https://openkomm.yussfone-crm.com/userfiles/file/26844682396.pdfIn PDF document text
    • https://swalaya.in/userfiles/file/24982791483.pdfIn PDF document text
    • http://safetruck.gr/images/file/gitolo.pdfIn PDF document text
    • http://sushimura1.com/uploads/files/4092157217.pdfIn PDF document text
    • http://apicn.net/upload/files/noxexemipobuninutezibazil.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_off0000fb66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB66 17212 bytes
SHA-256: c0b3ed31ddc570fbd69fe86b42c8356742904a07768151e84d1caceb4c8f46e7
font_01_sfnt_off0001281f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1281F 10724 bytes
SHA-256: 3ece11ecce91e461ca1731bf03583b23ed5cd802ec51da4c49b9696c5c49d6e1
font_02_sfnt_off000140af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1