Malicious PDF — malware analysis report

Static analysis result for SHA-256 e54b5e351a4e3ed2…

MALICIOUS

PDF

71.3 KB Created: 2021-09-08 19:27:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a736dcf8782fbf090d2c6cb410aa9eca SHA-1: 9e86987e6835c0c653314f75204dbd04e17fa511 SHA-256: e54b5e351a4e3ed2e0b7881cd9a53e29123c02629ddf4438bba1c96b5d08c8ed
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains, indicating a link farm designed to obscure the true destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and URL patterns are consistent with a malicious document designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://gowowdeli.com/uploads/files/47810132189.pdf In PDF document text
    • https://virtualpulse.eu/UserFiles/file/vumomoxixafubut.pdfIn PDF document text
    • http://barefoot.pl/userfiles/file/lotapes.pdfIn PDF document text
    • http://artin-intranet.com/ckupload/files/diletegamufo.pdfIn PDF document text
    • http://arsvet.ru/img/upload/wawaw.pdfIn PDF document text
    • https://stallion-international.com/userfiles/file/tojetefewexalaxivimib.pdfIn PDF document text
    • http://moiarchitekci.pl/pliki/file/85491430112.pdfIn PDF document text
    • http://indecomavo.pl/userimg/inc/89697499018.pdfIn PDF document text
    • http://dezmaster.com/userfiles/file/67177606560.pdfIn PDF document text
    • https://honghow.com/ckfinder/userfiles/files/govakazax.pdfIn PDF document text
    • https://www.ftha.org/admin/ckfinder/userfiles/files/dakabalasuwibaj.pdfIn PDF document text
    • http://nceed.kr/pds/userfiles/files/64836607554.pdfIn PDF document text
    • http://potya.com/sovox.pdfIn PDF document text
    • https://textosolutionslinguistiques.com/upload/editor/file/34611083719.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/61502202135.pdfIn PDF document text
    • http://dwornawodzie.pl/userfiles/file/leriwutofoliderejokajubi.pdfIn PDF document text
    • http://girc.ncue.edu.tw/ckfinder/ckfiles/files/bajoguwoguto.pdfIn PDF document text
    • http://fanta-life.com/userfiles/file/xafataguwajomifobeneja.pdfIn PDF document text
    • http://matsonconstruction.net/userfiles/file/98284026855.pdfIn PDF document text
    • http://mitchelllawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kidakagibowikivoxi.pdfIn PDF document text
    • http://www.galiantsolutions.com/emailimages/file/porikazomuwuzegaf.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/b73e718a482b55731f4d2fde4591cc19/mopafovawen.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/87aaefe08650350e8a8cc722233afab5/jelizuxizinu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=comment+apprendre+la+langue+anglaise+pdfPDF 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_off0000b846.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB846 10972 bytes
SHA-256: abb66f35a2957a10ca1c86d9d093759b4cd4cfb2da5eb9226dce8735b573599a
font_01_sfnt_off0000d17d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD17D 15576 bytes
SHA-256: f7edf1949bc9d82b9ee53fbab58b2ea8edcb2e1e0b5659740733c4427334486a
font_02_sfnt_off0000f773.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF773 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1