Malicious PDF — malware analysis report

Static analysis result for SHA-256 876a3d85c4dc1bed…

MALICIOUS

PDF

79.0 KB Created: 2021-09-14 02:45:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 719491355d3b78df460408d990f4cef4 SHA-1: 94d6aa9b8ac1406e522443aac45cc45bad505021 SHA-256: 876a3d85c4dc1bed49bbd496a9a5042f59afe1ee8e4396a58fd4096154940c76
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ML classifiers and ClamAV, indicating a phishing or malware distribution intent. It contains numerous embedded URLs, many of which point to potentially malicious domains, suggesting it's part of a link farm designed to redirect users to further malicious content. The PDF structure and embedded links are consistent with a phishing lure, likely intended to trick users into downloading further payloads or providing sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/56da9537f78ddbf20cc2ece85f59e181/nekenevako.pdf In PDF document text
    • https://purevdavaa.mn/uploads/ckfinder/files/84500884987.pdfIn PDF document text
    • http://falconltd.pl/cache/file/7226225325.pdfIn PDF document text
    • http://www.dfdtrading.sk/ckfinder/userfiles/files/74606173624.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/bamapowiritepagetasez.pdfIn PDF document text
    • https://heuresromantiques.com/upload/files/25245020202.pdfIn PDF document text
    • http://xn--80affcyoc0ac1f6a.xn--p1ai/admin/modules/ckeditor/ckfinder/userfiles/files/86541457182.pdfIn PDF document text
    • http://reguitti-engineering.it/userfiles/files/22326152800.pdfIn PDF document text
    • https://grootformaatspandoeken.nl/userfiles/file/73232727471.pdfIn PDF document text
    • http://benedictinoselrosal.org/ckfinder/userfiles/files/pulotaxilaven.pdfIn PDF document text
    • http://ahdjcm.com/upload/files/militisewixiw.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/16139628ad7c3c---11606870525.pdfIn PDF document text
    • http://rigassprotes.lv/uploadz/file/lexesekelomimosuwotuw.pdfIn PDF document text
    • https://optimumquestsolutions.com/ckfinder/userfiles/files/fejilosefepizejov.pdfIn PDF document text
    • https://getadoc.in/ckfinder/userfiles/files/5841656217.pdfIn PDF document text
    • http://sudeoksa.com/userfiles/file/20210912161654.pdfIn PDF document text
    • https://euronet.stonavka.cz/webpagebuilder/ckfinder/userfiles/files/puruxadejusepewox.pdfIn PDF document text
    • https://abyway.lv/images/ck_images/files/62122759157.pdfIn PDF document text
    • https://svltv.in/userfiles/files/77382334952.pdfIn PDF document text
    • https://lasanisports.com/files/29868114377.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=one+piece+dub+onlinePDF 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_off0000d174.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD174 17708 bytes
SHA-256: 1fe49eb6bfdf379d67b876a95eba74338d80c6e527ccb23739cc212425850a27
font_01_sfnt_off0000ffb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000117c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117C9 10244 bytes
SHA-256: ec2f30aa546840729ef47d300120c8217cf29b4f013a536a767280ce67399ebd

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