Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc8daaa931e485cb…

MALICIOUS

PDF

70.6 KB Created: 2021-09-21 05:05:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: cabfa6f04596c9ed6addb618d2198b42 SHA-1: 851525032bf94564e4e3dd9a6d95334c6e6dfd67 SHA-256: fc8daaa931e485cb4b2714734f599c9b416344161557d342b1f3a58329476664
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm directing users to numerous external URLs. The PDF structure and embedded URLs suggest an attempt to redirect users to potentially malicious websites, likely for phishing or to download further payloads. No scripts were extracted, but the presence of multiple external links points to a common phishing or malware distribution tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://crysiq.ru/uplcv?utm_term=watch+wrong+turn+1+online+free PDF link annotation
    • https://innovaciones-plasticas.com/imagenes_cont/sitio/documentos/daxegedavaf.pdfIn PDF document text
    • https://termokingbt.com/ckfinder/userfiles/files/vijivajijupejefavekom.pdfIn PDF document text
    • https://peusch.lu/userfiles/files/puguxopunixusut.pdfIn PDF document text
    • http://tropo-design.com/ckfinder/userfiles/files/20661540877.pdfIn PDF document text
    • http://arsvet.ru/img/upload/16217229802.pdfIn PDF document text
    • http://ingmarcofaedi.com/userfiles/files/fonanisajuvopajisidoj.pdfIn PDF document text
    • http://villabrown.it/userfiles/files/puxefumizulukek.pdfIn PDF document text
    • http://mvpbuilding.com/userfiles/file/63882144027.pdfIn PDF document text
    • http://csc0516.com/userfiles/file/20210901111916_yi5gdo.pdfIn PDF document text
    • http://3wsystems.com/shipinc/userfiles/files/konoxofabogiz.pdfIn PDF document text
    • http://bdsps.org/slbdavbatala/userfiles/file/nanemesuvevasanasolos.pdfIn PDF document text
    • https://alsultantrading.ae/userfiles/files/xuneguzujonigatisifalaz.pdfIn PDF document text
    • http://railwaysrailroads.com/upload_files/files/rovojoduweka.pdfIn PDF document text
    • http://biblioteka-belzec.pl/upload/files/fozomisu.pdfIn PDF document text
    • https://cafesca.info/ckfinder/userfiles/files/18643884450.pdfIn PDF document text
    • http://kpghomerepairs.com/uploads/image/files/jabawezosebanebarewa.pdfIn PDF document text
    • http://inistor.com/ufiles/files/18386288330.pdfIn PDF document text
    • http://redondoclassicburger.com/uploads/files/siripodujujote.pdfIn PDF document text
    • http://spodne-pradlo-2bpoint.sk/UserFiles/File/tinakizora.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/k3mgc5ppg2ka51a8vg8uvpr20d/82448024295.pdfIn PDF document text
    • http://www.firstpages.eu/app/webroot/files/userfiles/files/6047231858.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/c9a3c4408f84da41283c30774d2a12f9/92707657024.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_off0000b438.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB438 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC4F 10680 bytes
SHA-256: 8ff7ba87c51c4cf120aee261c38502ea0e8b6a916765676beef53349ece54cc2
font_02_sfnt_off0000e4d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D9 15676 bytes
SHA-256: 31583d1ada0f65e78cd8f1c343fcc085aa95a700ff17543e6c4009b93d887815

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