Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fb5c7379449306b…

MALICIOUS

PDF

69.3 KB Created: 2021-09-22 13:45:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 52bbf8a67a97aea5f2a9203e4ebaed72 SHA-1: dc003bdaeb9e978a9153b61786a6f8e6706f6d60 SHA-256: 0fb5c7379449306beebc13244f9a3c4dba4454452a190ba6c5108ebef49fcb99
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. The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://driver-jazda.pl/upload/file/40497347408.pdf In PDF document text
    • http://pnalog.ru/images/file/jekigovavamo.pdfIn PDF document text
    • http://seteo-dechets.com/images/file/tisedegapurabefipupijusaj.pdfIn PDF document text
    • http://quetthe.com/upload/files/jarajar.pdfIn PDF document text
    • http://biosurfest.com/userfiles/files/rotubasebekegataziropago.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613486ec77473---85361434167.pdfIn PDF document text
    • https://mokshadhamnepal.org/userfiles/files/webeloga.pdfIn PDF document text
    • https://sofahatinh.com/upload/files/ritupeto.pdfIn PDF document text
    • http://osheamaloneynylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/10923230563.pdfIn PDF document text
    • http://xn--j1aai7d.xn--p1ai/userfiles/file/xotiselu.pdfIn PDF document text
    • http://hitmet.slektenkaas.com/bilder/file/30925306980.pdfIn PDF document text
    • http://namlinhchisapa.com/userfiles/image/file/rafomisuxuvevit.pdfIn PDF document text
    • http://rotarylaspalmas.org/documentos/file/lewoxajak.pdfIn PDF document text
    • https://surupaceanu.ro/ckfinder/userfiles/files/logakamafasapomuduwu.pdfIn PDF document text
    • http://pngroup.pl/ckfinder/userfiles/files/xudenevojex.pdfIn PDF document text
    • https://itracmediav5.com/ckfinder/userfiles/files/99557653621.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/rukuxilad.pdfIn PDF document text
    • http://amindoost.ir/images/upload/files/44996322136.pdfIn PDF document text
    • http://www.groupementpecheduloir.com/ckfinder/userfiles/files/76436819416.pdfIn PDF document text
    • http://tnmetalworks.com/images/files/fimeruriz.pdfIn PDF document text
    • http://c2ctrading.org/cms_upload/files/semajulupev.pdfIn PDF document text
    • http://citranco.com/users/files/subiwumusozozi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=live+wallpaper+galaxy+s10+plusPDF 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_off0000b061.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB061 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c873.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC873 15176 bytes
SHA-256: 47abce0f3d7bfed779c4793849976db94804ba811a37a1db9a832fb962f534b7
font_02_sfnt_off0000eef4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF4 10704 bytes
SHA-256: 8c3e95f53db51ec035ca6d933ee8aedb49e30492c080dce546547789cd4fc8c5

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