Malicious PDF — malware analysis report

Static analysis result for SHA-256 3061fe650b6f94f8…

MALICIOUS

PDF

69.9 KB Created: 2021-09-20 05:52:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0490c189012deed4adc4d6d34ef88328 SHA-1: 40967f435c981ddbc601a1c52d8b64cbf0a58f3e SHA-256: 3061fe650b6f94f86b45bda1c06c8dacc6c166074db558a6407542a34c13e647
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malware. The document contains numerous embedded URLs, many pointing to disposable domains, and is identified as a link farm. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest an attempt to redirect the user to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://karolinanowak.com/userfiles/file/makiwaxufiso.pdf In PDF document text
    • https://rsun.pro/admin/ckfinder/userfiles/files/8886947148.pdfIn PDF document text
    • https://classykitchen.pl/web/uploads/files/mivotosofe.pdfIn PDF document text
    • https://alusol-kw.com/ckfinder/userfiles/files/bixena.pdfIn PDF document text
    • http://snap-drone.com/userfiles/file/73724936083.pdfIn PDF document text
    • http://hbisan.com/userfiles/file/foduzuzepiw.pdfIn PDF document text
    • http://mojahotels.com/ckfinder/userfiles/files/luwafubi.pdfIn PDF document text
    • http://101-games.ru/images/uploads/files/tusun.pdfIn PDF document text
    • http://drxzhang.com/userfiles/file/57958460030.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/eb99d797e9172ebfd23e875d8118f981/64353527830.pdfIn PDF document text
    • http://wx-test.com/upload/ckimg/files/202109190514531625.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/lubiretebuzipenitikipani.pdfIn PDF document text
    • http://showdoimovel.com/files/files/tapusebixixulutalosixiv.pdfIn PDF document text
    • http://hopkim.vn/upload/files/revutagevixelivuko.pdfIn PDF document text
    • http://autohondl.cz/userfiles/file/2665902505.pdfIn PDF document text
    • https://peiitw.com/Upload/ckeditor/files/25557275424.pdfIn PDF document text
    • http://co-wemart.com/careeruserfiles/file/sigavajadetiranutidaxi.pdfIn PDF document text
    • http://flomojapan.com/upload/files/muwibiponusugabumexun.pdfIn PDF document text
    • http://millecolori.it/images/file/47980036641.pdfIn PDF document text
    • http://techmechengineers.com/uploads/79173831517.pdfIn PDF document text
    • https://drhuanghair.com/uploads/files/202109180045344073.pdfIn PDF document text
    • http://vangphutai.com/images/uploads/files/jisiwumovuradixakab.pdfIn PDF document text
    • http://castrolmintabolt.hu/images/upload/file/vokanovo.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16135311abf562---71793003145.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=ludo+king+online+hack+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_off0000b485.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB485 10660 bytes
SHA-256: b0c26f8ff3b24309e7923b5a3830eba2dc44a741dc8f44f1f9813e002cf7c64e
font_01_sfnt_off0000cca7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCA7 14820 bytes
SHA-256: 98d470fed088e000678ae1822846ab297073105bffe70f6305af1d95f80353c8
font_02_sfnt_off0000f1b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1