Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5f5a75a065b573b…

MALICIOUS

PDF

70.2 KB Created: 2021-09-26 12:44:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 70e97812ba005ff89f29f6b677f83319 SHA-1: 29608f249e56b6bb9d0a55baccdb158998c2a373 SHA-256: b5f5a75a065b573bea3e1a5c32019f021dbc6dbdb411d562d41a47792f4e40fa
166 Risk Score

Malware Insights

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

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious. It contains numerous external URIs and is identified as a remote-support tool lure, instructing users to install or connect with such tools. The document's structure and embedded links suggest it is part of a phishing campaign designed to trick users into compromising their systems.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://pistant.ru/uplcv?utm_term=rooted+emulator+for+pc PDF link annotation
    • http://kovovyroba-nosniky.cz/UserFiles/File/velogifaza.pdfIn PDF document text
    • https://solelane.com/ckfinder/userfiles/files/nubelob.pdfIn PDF document text
    • http://em-mould.com/ckfinder/userfiles/files/50768959937.pdfIn PDF document text
    • http://instant-image.net/UserFiles/Site/File/likoliwa.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/b33fba8d919dd5b3875be301f5354d56/91109737675.pdfIn PDF document text
    • http://amsasecretariat.fr/userfiles/file/84610121099.pdfIn PDF document text
    • https://www.milestonesmn.org/ckfinder/userfiles/files/76918521178.pdfIn PDF document text
    • http://bahtiyardishekimi.com/fckfiles/file/nidezu.pdfIn PDF document text
    • https://www.disbel.es/ckfinder/userfiles/files/minemufutilimoputuwun.pdfIn PDF document text
    • http://batterseataxi.com/survey/userfiles/files/bonaro.pdfIn PDF document text
    • http://varadimasszazs.hu/uploads/files/72355519305.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/2e205b002f6243fa9ab5428b7c345d3f/81602404497.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/rijekotaj.pdfIn PDF document text
    • https://krusomying.com/data/file/24659722014.pdfIn PDF document text
    • http://www.tractortools.cz/ckfinder/userfiles/files/zinitav.pdfIn PDF document text
    • http://generoussecurity.com/uploads/wawenemapi.pdfIn PDF document text
    • https://repetitorebi.ge/userfiles/files/vijobozobenekukerezel.pdfIn PDF document text
    • https://cleanenergy.mn/uploads/files/lavekaj.pdfIn PDF document text
    • http://gagutp.com/sa_upload/userfiles/file/20210921171407.pdfIn PDF document text
    • https://detector-billetes.com/Imagenes/file/mobadonagowogumadevoboge.pdfIn PDF document text
    • https://premium-house.uz/images/file/82422641341.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/jogawoves.pdfIn PDF document text
    • http://circolosilverblufitnessclub.eu/userfiles/files/jimafowomufakugej.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_off0000af93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF93 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c7a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7A5 16688 bytes
SHA-256: 9b12c4f281cf212aaa06f2c6eb99ad5ce58880c6767b470457a22dd865eae9a2
font_02_sfnt_off0000f21e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF21E 10560 bytes
SHA-256: 547f3ef816bd232ef109d7139f997f81deb015396fe9be32d739cdf55dedacd7