Malicious PDF — malware analysis report

Static analysis result for SHA-256 c47a70111b45623e…

MALICIOUS

PDF

94.3 KB Created: 2021-09-09 03:15:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f990f1153a0e6aab9387cd70fae5f8f4 SHA-1: ea6b13316b2696713c6265151fd7d4be4e3b591f SHA-256: c47a70111b45623eb0a07ad85ca8fdf89e222d86aadf6a92589324873150758b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. 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 nature of the heuristics strongly suggest this PDF is designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nomylo.ru/uplcv?utm_term=a+bug%27s+life+movie+characters PDF link annotation
    • http://land89.com/ckupload/files/fazujikokupokexezamubokam.pdfIn PDF document text
    • https://hogozaty.com/ckfinder/userfiles/files/doxaborivijotusij.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/8c8484a09438919b50ff54b73a875ce9/97371291872.pdfIn PDF document text
    • https://jamisonfurnace.ca/userfiles/files/gapev.pdfIn PDF document text
    • http://ladyqueen.it/userfiles/files/jutejibusudefinenozoguni.pdfIn PDF document text
    • http://tycoonmedical.com/userfiles/file/84831200505.pdfIn PDF document text
    • http://baovekhucongnghiep.com/upload/files/jonamexigeri.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/bufatibinasinusijum.pdfIn PDF document text
    • http://champaigncursillo.com/userfiles/file/28745528213.pdfIn PDF document text
    • http://bud-med.eu/userfiles/file/takagakad.pdfIn PDF document text
    • http://softtox.pl/new/userfiles/file/42550195402.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/16134865666a52---46874817446.pdfIn PDF document text
    • https://apra.pl/files/file/30772976068.pdfIn PDF document text
    • http://lollanaclinic.com/image/upload/File/1056105349.pdfIn PDF document text
    • http://perilatomsk.ru/ckfinder/userfiles/files/tolinawobadi.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/1b5e95fc08fdf0dd229e218886761c96/24295966723.pdfIn PDF document text
    • http://tabouligrill.com/ckfinder/userfiles/files/4129908265.pdfIn PDF document text
    • http://steelbo.com/uploads/admins/u0/files/20210902135954.pdfIn PDF document text
    • http://balaton.varosom.hu/userfiles/files/gidulak.pdfIn PDF document text
    • http://cerritos.songhakbbq.com/uploads/files/vurusisozuw.pdfIn PDF document text
    • http://alrehabourhome.com/userfiles/files/1106108751.pdfIn PDF document text
    • http://kompassztuki.pl/Image/files/zeluxepewufoliriwapukujaf.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_off00010807.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10807 19564 bytes
SHA-256: aba6fad08139fb6921b5a1138c6e7215fb925bead4b4ab1a8de3b161a44f2fd1
font_01_sfnt_off00013a07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A07 11000 bytes
SHA-256: 7ccaf09b2608d9feaba1bd2947367c3aa9d4b6d241a154df6117e4014e6ae5db
font_02_sfnt_off000153b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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