Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8b4ed5342b6d31e…

MALICIOUS

PDF

69.7 KB Created: 2021-09-27 07:24:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5e98de7d643936e7ba352f714dba8b1a SHA-1: a832baa35ecc82db1b6b1ab6d48e86b6f94350d8 SHA-256: b8b4ed5342b6d31e8dcfee9005afc10d3294d3e0c5bec56da9b2ae3330403119
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to PDF files hosted on various domains, suggesting a link farm designed to obscure the true malicious intent. The presence of a Google feedproxy URL with a 'gta 5 vice city apk download' term indicates a lure for potentially unwanted software or malware.

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 https://tennis-samara.ru/img/file/15029041738.pdf In PDF document text
    • http://tjsyjdq.com/v15/Upload/file/2021981925366377.pdfIn PDF document text
    • http://youandisagenix.com/ckfinder/userfiles/files/94843708520.pdfIn PDF document text
    • https://milorem-service.ru/userfiles/file/2264739852.pdfIn PDF document text
    • http://xprchemical.com/upload/files/giravefasuxifobagobatezek.pdfIn PDF document text
    • https://sahyadrisevasanstha.in/userfiles/file/47157645934.pdfIn PDF document text
    • http://noithatnhapkhaugiasi.com/luutru/files/13431130989.pdfIn PDF document text
    • https://anandamsanyal.com/userfiles/file/jarodazejoritawu.pdfIn PDF document text
    • https://clubslotalmatriche.com/calcas/file/sulaf.pdfIn PDF document text
    • https://divetechmarine.com/contents/files/vapovisemozalotorefejopi.pdfIn PDF document text
    • https://groupunsur2.com/contents/files/5453690337.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613a6621d15f9---ridexetizaruvu.pdfIn PDF document text
    • http://camonetinternational.com/files/file/teguduxiji.pdfIn PDF document text
    • https://rowsontw.com/shopadmin/upload/files/85378825192.pdfIn PDF document text
    • https://ooo-kenk.ru/userfiles/file/wikomumimo.pdfIn PDF document text
    • https://coffotea.com/uploads/files/202109211233024104.pdfIn PDF document text
    • http://eichler-kammerer.de/5358714197.pdfIn PDF document text
    • http://abwlargo.com/uploads/files/pulanub.pdfIn PDF document text
    • http://osayit.com/images/file/tedulumirodebunurumiw.pdfIn PDF document text
    • https://nstoplana.rs/ckfinder/userfiles/files/nasunodumi.pdfIn PDF document text
    • http://artpolinakuzina.ru/pict/file/72983661047.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/f3b2fc463f00be85dd54779bd18b94c6/22007313485.pdfIn PDF document text
    • http://daearesort.com/FileData/ckfinder/files/20210905_34D2F0D1E2A990E9.pdfIn PDF document text
    • http://bastola.org/userfiles/file/76720808316.pdfIn PDF document text
    • http://systemsbiology.at/uploads/assets/file/dowimomibop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=gta+5+vice+city+apk+downloadPDF link annotation
    • 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_off0000b030.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB030 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c847.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC847 10772 bytes
SHA-256: 497d3c46bd9184feeb7807d530333db4fd3c7541c51942d439dbd699cb4e958f
font_02_sfnt_off0000e15a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE15A 15904 bytes
SHA-256: 091a86f565a11c9e8c456b3a12c39aea97aece99b63bbc19420f54cb7347285d