Malicious PDF — malware analysis report

Static analysis result for SHA-256 7310a6f25408c7d0…

MALICIOUS

PDF

89.4 KB Created: 2021-09-19 22:37:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 5e9da678eba755cc24248f64579de918 SHA-1: 0cb7bdaa6d9b2b30c3ba50b81613263e7eab94b1 SHA-256: 7310a6f25408c7d08030709558cad2eb358cdd34c49adc9d41a01260ec5779f8
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 ClamAV as a phishing trojan. Heuristics indicate it uses a browser extension installation lure, a common social-engineering tactic. The document contains numerous external URLs, suggesting it may attempt to redirect the user to malicious sites or download further payloads. While no scripts were explicitly extracted, the presence of PDF_URI and ML_NYX_PDF_MALICIOUS firings, along with the overall context, points to a malicious intent to trick the user into executing malicious code.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://crysiq.ru/uplcv?utm_term=how+to+open+console+on+chrome+android PDF link annotation
    • https://lederstuhlshop.de/ckfinder/userfiles/files/1605318029.pdfIn PDF document text
    • http://holidayservicemarsala.it/userfiles/files/19359767745.pdfIn PDF document text
    • http://thenikharvconsultancy.com/userfiles/file/68010816854.pdfIn PDF document text
    • http://gewidor-gmbh.de/uploads/files/pipokedomarufupasewusene.pdfIn PDF document text
    • https://ver9.sonikgps.com/ckfinder/userfiles/files/73234273911.pdfIn PDF document text
    • https://optimuselearningschool.com/learning/site/images/uploadfiles/68297339121.pdfIn PDF document text
    • http://metallpress.ru/files/bamuxopizarog.pdfIn PDF document text
    • http://itagqatar.zajeltel.com/itag/file/files/demajifijerirog.pdfIn PDF document text
    • https://www.pirkitpadangas.lt/ckfinder/userfiles/files/43538104109.pdfIn PDF document text
    • http://hotelrefah4ter.ir/basefile/hotelrefah4terir/files/95329441124.pdfIn PDF document text
    • https://textosl.com/upload/editor/file/85233886311.pdfIn PDF document text
    • https://ou-ravda.com/ckfinder/userfiles/files/21499599994.pdfIn PDF document text
    • https://hometeamcorp.com/images/usr/1402456154.pdfIn PDF document text
    • https://www.hermanosvalerorecio.com/ckfinder/userfiles/files/60578661882.pdfIn PDF document text
    • http://jfe.hk/userfiles/5537484812.pdfIn PDF document text
    • https://www.educationsexuelle-ecole.ch/ck/ckfinder/userfiles/files/99671664731.pdfIn PDF document text
    • http://irinabailey.com/upload/files/wazorewamoken.pdfIn PDF document text
    • http://eyupsifalibitkiler.com/resimler/files/vatidemakirodadorufomaziz.pdfIn PDF document text
    • http://interreg-ipa-husrb.com/downloads/17158377871.pdfIn PDF document text
    • http://www.dereformasenalicante.com/archivos/files/75416161992.pdfIn PDF document text
    • http://galettedesrois.eu/userfiles/file/xatatomoporaje.pdfIn PDF document text
    • http://pereplanirovkaoblast.ru/pict/file/58873306402.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16145b00365f81---gokanamewugibakekowukaz.pdfIn PDF document text
    • http://hometextiles-consultant.com/ckfinder/userfiles/files/37294348463.pdfIn PDF document text
    • http://tdbakademi.org/userfiles/files/94865928452.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_off0000f793.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF793 10856 bytes
SHA-256: 2762f2f564bb4530024a4365a55433eea700f02a210cbfa3345c5a5ff093b555
font_01_sfnt_off00011078.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11078 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001288a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1288A 18356 bytes
SHA-256: 9402933f6bb0f66d4c83365bb3cea1b12fba2dc4abe7a0191fe3a2a97cf6ee42