Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b919bc99e5069b5…

MALICIOUS

PDF

84.5 KB Created: 2021-09-12 08:26:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0e539c625a67321b7fbd477a4d8b11d9 SHA-1: c409be0414403d1466697e7a59f77a9a75134c5a SHA-256: 5b919bc99e5069b5d0bb2bc4c619107266d22a55afbf8a2c852b2f8bbc3edf66
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://philabc.ru/uplcv?utm_term=go+player+app+android PDF link annotation
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613bffd167dc1---tixun.pdfIn PDF document text
    • http://nkmate.com/FileData/ckfinder/files/20210903_A0028417CACC53C5.pdfIn PDF document text
    • https://laser123.com/geektic/files/tejuku.pdfIn PDF document text
    • https://lecormier-menuiserie.com/www/upload/files/poxagos.pdfIn PDF document text
    • http://newshop.jp/archive/file/27844175698.pdfIn PDF document text
    • http://sokole-tps.pl/userfiles/file/67145017624.pdfIn PDF document text
    • https://mauspro.net/upload/files/mokizaxapumuwelotuga.pdfIn PDF document text
    • http://drprdesaihospital.com/uploads/85915592237.pdfIn PDF document text
    • http://ropesadventure.com/d/files/jeloguxuvasubedapesav.pdfIn PDF document text
    • https://bestrecycledautoparts.net/images_i/file/xanexevijususefomirutixow.pdfIn PDF document text
    • http://kryotherapie.net/neu/userfiles/file/posulekejerumo.pdfIn PDF document text
    • https://lomasdelaweb.com/userfiles/2008.09/file/15671581944.pdfIn PDF document text
    • https://thehideawayresortpattaya.com/userfiles/files/43078441394.pdfIn PDF document text
    • http://studiofantino.it/userfiles/files/18922986031.pdfIn PDF document text
    • https://profitaler.com/UserFiles/file/nupewavidekafof.pdfIn PDF document text
    • http://onelove.cz/file/88822921683.pdfIn PDF document text
    • http://bjqyms.com/filespath/files/20210911125132.pdfIn PDF document text
    • http://eatatrudy.com/uploads/files/90947788655.pdfIn PDF document text
    • http://appextskihjthj.handysociality.com/upload/files/sumedobedixijiwu.pdfIn PDF document text
    • https://ventadeterrenosurbanos.com/userfiles/file/83268312151.pdfIn PDF document text
    • https://nnkcreations.com/userfiles/file/wedofikoxanuridazejapud.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/srq4l47o256s7q7pcp5ktlg7je/86250044390.pdfIn PDF document text
    • https://euforbiabulgaria.com/uploads/pages/files/zenivivat.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_off0000e8c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C8 17332 bytes
SHA-256: a3869d75eacaa111304f733974f8a167a0d10128e00611f01f98d598b1837bfe
font_01_sfnt_off000115b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115B8 10272 bytes
SHA-256: 6c0504fa8d202a39b949fe2ca9a27045ce691d2b6217fab52e0b4b2e734ff2d8
font_02_sfnt_off00012ce5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CE5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1