Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb3bca7389ad6da5…

MALICIOUS

PDF

70.1 KB Created: 2021-09-28 02:47:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 56a1af872f5ae02535eee70f9a0e2877 SHA-1: 0bb59dcadcf83637d7a9ab95a5178224721b7e44 SHA-256: eb3bca7389ad6da5758b8eced54500069c112f6ecc7bb6072cc48ffa47e0b340
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to a link farm, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were directly extracted, the structure and URL patterns are consistent with a malicious PDF designed to redirect users to further malicious 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://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16146171517816---gopufuxatukumapivemewumej.pdf In PDF document text
    • http://eco-building.cz/UserFiles/File/gufamek.pdfIn PDF document text
    • http://hit-air.pro/ckfinder/userfiles/files/23736623665.pdfIn PDF document text
    • https://myagenda.myagenda.cz/pictures/editor/files/3664999755.pdfIn PDF document text
    • http://artetendasud.it/userfiles/files/93355496697.pdfIn PDF document text
    • http://www.rafaellucenaehijos.com/ckfinder/userfiles/files/mawuwufozaviwifafitavilev.pdfIn PDF document text
    • https://total-sport.pl/img/upload/files/pawivugisebuwudavuwonix.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/labojotomugubeluvot.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ce02676535---jubokakomomami.pdfIn PDF document text
    • http://jj-metals.com/userfiles/file/2021090409561173499.pdfIn PDF document text
    • https://rimi.sk/userfiles/file/tegutut.pdfIn PDF document text
    • https://tanhaithanhvalves.com/quangcao/admin/file/subemiwido.pdfIn PDF document text
    • http://xn--zb0by3yusal20ak5lcidnwigi.com/ckfinder/userfiles/files/1632664410.pdfIn PDF document text
    • http://bright-inter.com/file_media/file_image/file/49311832017.pdfIn PDF document text
    • https://n-tlg.com/files/file/zumevijuraduwup.pdfIn PDF document text
    • http://xn--38-mlcqjbufcz6h.xn--p1ai/userfiles/file/58870128687.pdfIn PDF document text
    • https://salondumariagededijon.com/userfiles/file/poledojibonemesusoje.pdfIn PDF document text
    • https://seerupit.dk/assens/file/kizadomuwukipelo.pdfIn PDF document text
    • http://bochkari24.ru/pic/file/mujonowomebomopatodinif.pdfIn PDF document text
    • http://osteriailgalloelinnamorata.com/userfiles/files/niborimogabepivezasix.pdfIn PDF document text
    • http://ovecollection.com/royal/admin/images/products/file/jegona.pdfIn PDF document text
    • http://uniradioweb.info/userfiles/files/70862641417.pdfIn PDF document text
    • https://perfumes.dropship-tracking.com/userfiles/files/38430828279.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=real+dj+app+for+androidPDF 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_off0000b272.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB272 10400 bytes
SHA-256: 418b832000459c0a50c595a0664de58b2fa633883f8ba693ea86ebccc6f0a986
font_01_sfnt_off0000c9f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9F4 16048 bytes
SHA-256: 3fc93b86666b7e802b84a1b1a173224d040b05ebd624d2e22a3e72c6d271b025
font_02_sfnt_off0000f2b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1