Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bd02a6922ac0f74…

MALICIOUS

PDF

81.2 KB Created: 2021-09-24 05:31:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: cb12d24737989e00b3ee0c0076d1b301 SHA-1: 1cc05462ad7a96f7ed6823efc57473379a6195cf SHA-256: 8bd02a6922ac0f74a9c4c524d5beccf5a749e527bb792104bf6236b20b5a8262
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of numerous embedded URLs, many pointing to disposable domains and employing UTM parameters, suggests a phishing or link-farming operation. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically indicates the document's purpose is to redirect users to external, potentially malicious, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://infrive.ru/uplcv?utm_term=how+to+see+who+viewed+your+tiktok+profile+june+2020 PDF link annotation
    • http://absolutelyneon.com/userfiles/file/sizavufu.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/66006653191.pdfIn PDF document text
    • http://uelzecht.lu/userfiles/files/74754321791.pdfIn PDF document text
    • http://yugang360.com/upload_fck/file/2021-9-10/20210910132833423420.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/2ab4cf3a100243bc2f6ab3e8ed002d71/17739601654.pdfIn PDF document text
    • http://colantuono.it/userfiles/files/62091628888.pdfIn PDF document text
    • http://phfamilyrestaurant.com/uploads/files/kerubiguwimifujegijikesu.pdfIn PDF document text
    • http://robertoantoniz.com/resources/original/file/kujexunigevobed.pdfIn PDF document text
    • http://anabakorea.jp/userfiles/file/tojadaxukaridejijufumeru.pdfIn PDF document text
    • http://mgtofubbq.com/uploads/files/16792436153.pdfIn PDF document text
    • http://almawred-sy.com/files/adminfiles/files/gesafifipadomino.pdfIn PDF document text
    • https://nezrenpin.com/calisma2/files/uploads/benobe.pdfIn PDF document text
    • https://sbsoftware.ro/admin/userfiles/file/wimopuxolibawuvixog.pdfIn PDF document text
    • https://szalkasszorutacskok.hu/app/webroot/files/content/files/nalunotedotibuwomaxo.pdfIn PDF document text
    • https://kimansion.com/uploads/file/73975369750.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614709521df61---nagakezetopugadimu.pdfIn PDF document text
    • http://jfe.hk/userfiles/2054023834.pdfIn PDF document text
    • http://xn--k1akb4c.xn--p1ai/userfiles/file/filin.pdfIn PDF document text
    • https://perfumes.dropship-tracking.com/userfiles/files/38430828279.pdfIn PDF document text
    • https://grdr.org/paidel/ckfinder/userfiles/files/telukate.pdfIn PDF document text
    • http://kmjjt.com/uploadfiles/file/231045218542.pdfIn PDF document text
    • http://expresskaliski.info/file/voguririmi.pdfIn PDF document text
    • http://goldmustang.com/files/files/kasawuvutofexetar.pdfIn PDF document text
    • http://hotelbelleepoque.bg/userfiles/file/77429278500.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_off0000d7a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7A6 17388 bytes
SHA-256: a5ffecc1fd085153725313b9ca977eba8bc0977e590209296d8e20f61760a382
font_01_sfnt_off00010456.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10456 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C6D 11252 bytes
SHA-256: 49c9cf862fe1b964ead19aee8a197c56c8bd5c67ffac29c4b25ff9b19a83ce21