Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed822a94f5c79806…

MALICIOUS

PDF

93.7 KB Created: 2021-09-13 10:24:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 57c6b4e8b953e17f13e96cd19738247e SHA-1: 6432b713624834bdcb8a3cb9e8610640c8e06fbc SHA-256: ed822a94f5c798069c35204df79724a53e88e602b0e1069762bfff7d576af426
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, with one heuristic specifically identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and numerous external URIs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://coretry.ru/uplcv?utm_term=new+bollywood+full+movies+2019+download PDF link annotation
    • https://siahotel.com/userfiles/files/zokowonubedug.pdfIn PDF document text
    • http://astmasme.com/userData/board/file/22682040288.pdfIn PDF document text
    • https://festival.bg/fckeditorfiles/file/borosapaxemovimifexodoso.pdfIn PDF document text
    • http://azseal.net/uploads/userfiles/file/demolusalagixezokiwokuvep.pdfIn PDF document text
    • http://go-pxl.com/uploads/files/67620180739.pdfIn PDF document text
    • http://villahetzwartepaard.nl/survey/userfiles/files/55739707217.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/kegifevametogasa.pdfIn PDF document text
    • http://gimnazjum-krasiczyn.pl/img/userfiles/file/75488588090.pdfIn PDF document text
    • http://usmleworkout.com/files/file/xubagexitule.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613010d58fb7b---85848752117.pdfIn PDF document text
    • https://anitt.in/ckfinder/userfiles/files/wanovafodatizodigus.pdfIn PDF document text
    • http://le-bouquet.be/userfiles/files/popixosebimesivoga.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16134ba50a509b---xedonu.pdfIn PDF document text
    • http://fotocaroli.it/userfiles/files/95289032985.pdfIn PDF document text
    • http://prosefkuchare.cz/userfiles/mosor.pdfIn PDF document text
    • http://perfect-gallery.com/userfiles/file/49115556280.pdfIn PDF document text
    • http://aczelzalog.hu/tmp/60549471188.pdfIn PDF document text
    • http://ariogalospspc.lt/userfiles/file/2636592419.pdfIn PDF document text
    • http://damnoen.com/ckfinder/pho/files/rukokerojajoline.pdfIn PDF document text
    • https://aljuboori.com/userfiles/files/96385954027.pdfIn PDF document text
    • http://forumts.com/ckfinder/userfiles/files/30291772631.pdfIn PDF document text
    • https://mystruggle.uk/indigo/ckfinder/userfiles/files/24446547875.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/25209277790.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_off00010843.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10843 17700 bytes
SHA-256: 64078e6c214c19c61157198e8ea81e2d8251236679d5b455d47f8a31d15b8154
font_01_sfnt_off000135e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135E9 11264 bytes
SHA-256: 37a2159e7af960868a5e4d7eda62a59533a645f98f05cbe05d92dfed9a7ffe4e
font_02_sfnt_off00015078.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15078 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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