Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dd9ee7f5c86b6c4…

MALICIOUS

PDF

75.0 KB Created: 2021-09-15 12:17:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 198924e63f8410cbaa30b205fe863516 SHA-1: b55428115c52595afc0b4654aaa4e98673316180 SHA-256: 4dd9ee7f5c86b6c45e9f309d28c5d216e9c50cacfa964d9e3386a793277450fd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, a common tactic for phishing or distributing malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to lure users to malicious sites, likely as a first stage in a phishing or malware delivery chain.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://drafthe.ru/uplcv?utm_term=root+emoji+iphone PDF link annotation
    • http://bscartridge.com/pic/60935006294.pdfIn PDF document text
    • http://pegastelco.com/pictures/files/dusesedasulejuzit.pdfIn PDF document text
    • https://sca-eagleegg5k.com/ckfinder/triplebuserfiles/file/11653107030.pdfIn PDF document text
    • http://www.saletime.gr/admin/fckfiles/file/gunurirupuvaxak.pdfIn PDF document text
    • http://bigyikesmedia.com/home/xtremweb/public_html/consultinstitute/web/upload/files/39767296079.pdfIn PDF document text
    • https://manuscripthandler.com/userfiles/file/gorew.pdfIn PDF document text
    • http://architettosbaffo.com/userfiles/files/lobinategapizozarowajuru.pdfIn PDF document text
    • https://euforbiabulgaria.gbinvest.net/uploads/pages/files/80435752518.pdfIn PDF document text
    • https://mptradingcompany.com/userfiles/file/82137604906.pdfIn PDF document text
    • https://klubkanine.com/home/klub/public_html/ckfinder/userfiles/files/gowusagerujepidorur.pdfIn PDF document text
    • http://srtcivilnorth.com/ckeditor_file/files/tapuxedosakaperekabil.pdfIn PDF document text
    • https://bhiringisamsankalimandir.org/ckfinder/userfiles/files/90430759307.pdfIn PDF document text
    • https://gitteszoneklinik.dk/ckfinder/userfiles/files/buwaxe.pdfIn PDF document text
    • http://checopharma.com/upload/files/bowixowopewamividumu.pdfIn PDF document text
    • http://market-oborudovanie.ru/upload/file/dogije.pdfIn PDF document text
    • https://home-consult.lu/userfiles/files/kukejifujeta.pdfIn PDF document text
    • https://omprintandpack.com/userfiles/file/34447264833.pdfIn PDF document text
    • http://iwort.de/userfiles/file/94657251168.pdfIn PDF document text
    • https://centrumschoolka.pl/photos/file/27083555663.pdfIn PDF document text
    • http://asja.ua/userfiles/file/sekezikavokuzefunoz.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/nunikiwuxezuwegadu.pdfIn PDF document text
    • http://audiohrestomatiya.ru/content/file/23184870947.pdfIn PDF document text
    • http://brmhn.com/userfiles/file/20210913003327_yypaem.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_off0000c39a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC39A 17140 bytes
SHA-256: ee2374795027735b69ce4204006d2c82990aeceb7f3851f9198311498c0f1a83
font_01_sfnt_off0000efee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFEE 10216 bytes
SHA-256: 19eba511f0bbe841330b4af2d5feea3da260701e8b059af91e0caea307cd158d
font_02_sfnt_off00010698.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10698 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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