Malicious PDF — malware analysis report

Static analysis result for SHA-256 05b91020fe48cbe4…

MALICIOUS

PDF

85.5 KB Created: 2021-09-08 21:14:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a58b5bb8aa2afbbf10e86b60f682af20 SHA-1: 47643edf47db684b77d497a51375ca4dc110b6e4 SHA-256: 05b91020fe48cbe4c6c1317ccb3452a8b8d5ff4f2fe28f221a836571d8ffceab
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to a link farm hosted on disposable domains, a common tactic for distributing malware. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://msiutilities.biz/documents/gumusi.pdf In PDF document text
    • http://adgroup.co/userfiles/file/93655556782.pdfIn PDF document text
    • http://vagtteam.dk/userfiles/Files/43095988232.pdfIn PDF document text
    • https://lederstuehle-shop.de/ckfinder/userfiles/files/75247354112.pdfIn PDF document text
    • http://wernitznigg.at/files/vutabogodibafoxisul.pdfIn PDF document text
    • https://matteagianotti.ch/userfiles/files/82056058041.pdfIn PDF document text
    • http://softwaretesting.kr/club/data/userfiles/file/20210904041730.pdfIn PDF document text
    • http://dooroc.com/tk/upload/file/24973279876.pdfIn PDF document text
    • http://ruresept.ru/files/file/tofojaxisatonis.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131a46cdf5b0---28436119001.pdfIn PDF document text
    • http://www.depomatrial.com/file/jadidi.pdfIn PDF document text
    • http://entrackintl.com/uploads/91866593846.pdfIn PDF document text
    • https://smwebtechnology.com/arishayurveda.com/userfiles/file/31942075748.pdfIn PDF document text
    • http://askaudit.ru/price/kizisozosatikek.pdfIn PDF document text
    • http://wcsps.com.tw/ckfinder/userfiles/files/53067987589.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/16132e37aabbb5---37912201119.pdfIn PDF document text
    • https://swaarm.de/app/webroot/upload/files/77891839701.pdfIn PDF document text
    • http://novo-foto.ru/ckfinder/userfiles/files/29087851279.pdfIn PDF document text
    • http://hawaiianhunareiki.it/file/41199353123.pdfIn PDF document text
    • https://architektor.ru/uploads/file/58567885700.pdfIn PDF document text
    • http://erictex.com/ufiles/files/63084334935.pdfIn PDF document text
    • https://postelezmasivu-liberec.cz/ckfinder/userfiles/files/rukevugusuk.pdfIn PDF document text
    • http://escrima-rlp.de/userfiles/file/kenodogiv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=nda+syllabus+pdf+2018+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_off0000ec0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC0A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010421.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10421 10988 bytes
SHA-256: a6efadb5328870630421d90eb6023dde0ab0c92c280588d033f161b9acaa13cd
font_02_sfnt_off00011db2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DB2 16792 bytes
SHA-256: 82f7f6d6f1119df0d343e34467c8815e43165ed20fde52c5e64ec8ed4eb91e51

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