Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbce194f90cf6204…

MALICIOUS

PDF

79.8 KB Created: 2021-09-24 01:25:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9929d4b895b60f1a3f0707b4ace67c02 SHA-1: 5ba98f6b1064d32222f78dc6789f08a55f5a4c6d SHA-256: dbce194f90cf6204b8e3a121ef17fbe8d8ceb3595cfc129c28d11d3ce24c5b07
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are part of a link farm, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://prplus4u.com/ckupload/files/tisuwud.pdf In PDF document text
    • https://study-abroad-travel.com/ckfinder/userfiles/file/mobajabuletif.pdfIn PDF document text
    • http://canadianrockies.ca/files/file/gijov.pdfIn PDF document text
    • https://seltec.io/images/uploads/files/76885684680.pdfIn PDF document text
    • http://beta-rc.com/upload/files/196311750.pdfIn PDF document text
    • https://steammining.com/userfiles/file/1006492798.pdfIn PDF document text
    • http://sinostandards.net/upload/files/14925151999.pdfIn PDF document text
    • https://www.southdownscellars.co.uk/ckfinder/userfiles/files/bidagivulafopuw.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/22837802166.pdfIn PDF document text
    • https://ezokniga.com/uploads/file/86876911850.pdfIn PDF document text
    • http://akcihlar.cz/userfiles/file/tegozupotupasoxaparaj.pdfIn PDF document text
    • https://leo.tw/upload/ckeditor/files/1347568158.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b239c51a4c---vejujulezuxoxepuzo.pdfIn PDF document text
    • https://jung-yeunjang.ch/userfiles/file/diwudidavuvu.pdfIn PDF document text
    • http://naturallabs.fr/userfiles/file/wexiz.pdfIn PDF document text
    • http://velo.hu/UserFiles/file/80679108347.pdfIn PDF document text
    • https://www.prshots.com/ckfinder/userfiles/files/85785528362.pdfIn PDF document text
    • http://zaiger.ru/img/file/50283993390.pdfIn PDF document text
    • http://www.investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/rovalemodake.pdfIn PDF document text
    • https://f27szerviz.hu/upload/files/rigupajawot.pdfIn PDF document text
    • http://cathugo.de/res/wysiwyg/file/10814840063.pdfIn PDF document text
    • https://slide-bearing.com/d/files/4016499538.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=marvel+contest+of+champions+unlimited+moneyPDF 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_off0000d177.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD177 11156 bytes
SHA-256: 77c09ef8c358cc29c9e69f46ca1e5fd322f8128b877363d21cb5a0fdb091aaef
font_01_sfnt_off0000eb62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB62 17552 bytes
SHA-256: 47c7c9a89d0821938b7934f4c07c92863b37529e874813794eacd2e7291c9a16
font_02_sfnt_off00011902.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11902 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1