Malicious PDF — malware analysis report

Static analysis result for SHA-256 5890d79e16c895a9…

MALICIOUS

PDF

72.5 KB Created: 2021-09-12 06:00:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d7861b6f99b37524245e6111bacbe37a SHA-1: d3eb0d6ba84c8dbc8d44d77ba041a35804c85bea SHA-256: 5890d79e16c895a9984bf0ca843e9658f088b83d4af59d4e5126422ab38e222b
126 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many of which point to disposable domains and appear to be part of a link farm, suggesting a phishing or malware distribution scheme. The presence of external URIs and the 'link farm' heuristic indicate the document's primary purpose is to redirect users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://tandartsindex.nl/images/uploads/81389802123.pdf In PDF document text
    • http://www.farmaciapenil.es/userfiles/files/dofexafagofizinikaxubu.pdfIn PDF document text
    • http://koreadramatour.com/FileData/ckfinder/files/20210906_6F1AF0BCF564E33E.pdfIn PDF document text
    • http://karinameal.com/imgdish/files/22365434651.pdfIn PDF document text
    • http://agilesolutions.in/uploads/88423466393.pdfIn PDF document text
    • http://scuderieverdina.it/scuderia/userfiles/file/fesonapuxotefeze.pdfIn PDF document text
    • http://sjhrz.com/images/upload/File/sobixi.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161349ad21234c---sujivovofeloxad.pdfIn PDF document text
    • http://numismatika-nbkpdy.cz/userfiles/file/jibufomejojerukumidi.pdfIn PDF document text
    • http://zelene-centrum.cz/webpagebuilder/ckfinder/userfiles/files/wupadaxolosuv.pdfIn PDF document text
    • https://lyonsinn.com/nbloom/fckuploads/file/vunezenip.pdfIn PDF document text
    • http://zechnerbau.at/images/content/files/sunikiw.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613169a2a1293---kedeti.pdfIn PDF document text
    • http://hvpeds.com/upload/contents/file/53973688277.pdfIn PDF document text
    • http://upasamed.org/Content/uploads/files/32838657199.pdfIn PDF document text
    • https://binarbaidrealestate.com/public_html/userfiles/file/taxob.pdfIn PDF document text
    • https://agrando.cz/files/file/lotefaxol.pdfIn PDF document text
    • https://dogathermalhotel.com/resimler/files/52530306944.pdfIn PDF document text
    • http://winhazel.com/indigo/ckfinder/userfiles/files/fitoxunedepixupigojum.pdfIn PDF document text
    • https://wolfgang-photography.com/userfiles/files/41216811688.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/2296404382.pdfIn PDF document text
    • http://vizcsap.hu/files/file/mijixafexelavebesopivij.pdfIn PDF document text
    • https://airbays.com/userfiles/file/42640320175.pdfIn PDF document text
    • https://reklama71.ru/upload_picture/3955502689.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=avatar+the+last+airbender+the+search+part+1+pdf+downloadPDF 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_off0000b788.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB788 16564 bytes
SHA-256: 331dd9751c3d3300aa878d9db36046366fa733f85797b03f74714fe493a08a56
font_01_sfnt_off0000e257.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE257 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fa6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA6E 11040 bytes
SHA-256: b0b80fcb9e2db42deebbc96819ecd822bd8adba60eba6002b7def0ffeac7e9af

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