Malicious PDF — malware analysis report

Static analysis result for SHA-256 84058eef83b13d56…

MALICIOUS

PDF

85.6 KB Created: 2021-03-18 23:22:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: a15bf10528d35245032f42dfdf2eb11c SHA-1: 72832f8582d79b7e520c3c1e522636597ec1b3f9 SHA-256: 84058eef83b13d569ca8f87d39f965f0ba4a35fffc9b370f593fcfd66de63e9d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous embedded URLs, many pointing to disposable hosting or potentially malicious domains, suggesting it's part of a link farm designed to redirect users. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a tactic to appear in search results and lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://xajibur.ru/award?keyword=carteira+de+vacina%25C3%25A7%25C3%25A3o+cachorro+pdf PDF link annotation
    • https://cdn.sqhk.co/bebumila/mEMidhj/92564770696.pdfIn PDF document text
    • https://cdn.sqhk.co/borefigux/Iqujdib/57579261820.pdfIn PDF document text
    • http://tapidiv.medianewsonline.com/dell_latitude_e7450_specs.pdfIn PDF document text
    • https://cdn.sqhk.co/givesaxi/jfigrrZ/registro_do_brasfoot_2019_android.pdfIn PDF document text
    • https://cdn.sqhk.co/nakizenonetu/cjaifgI/87832113607.pdfIn PDF document text
    • http://gowanenutik.mypressonline.com/which_samsung_phones_support_wireless_charging.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373004/normal_5fdad56b3a5a6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494875/normal_604ab59fd8ed1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447084/normal_6024a11e352f2.pdfIn PDF document text
    • http://fotubobuwenapu.scienceontheweb.net/98106934721.pdfIn PDF document text
    • http://midikakuvekume.mywebcommunity.org/68470611510.pdfIn PDF document text
    • http://xifotole.iblogger.org/appleton_academy_uniform.pdfIn PDF document text
    • http://punejew.mygamesonline.org/pixan.pdfIn PDF document text
    • http://zijozarub.mygamesonline.org/xomanomizawim.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://daxevetefixidaj.epizy.com/98222813618.pdfIn PDF document text
    • https://s3.amazonaws.com/fumiposamisur/stellaris_gameplay_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/babetafaperaxov/software_development_life_cycle_agile_template.pdfIn PDF document text
    • https://s3.amazonaws.com/rumezo/32506596642.pdfIn PDF document text
    • http://jabodegodonirad.atwebpages.com/quais_so_os_tipos_de_artes_plsticas.pdfIn PDF document text
    • https://s3.amazonaws.com/gogoxowiniza/16608892374.pdfIn PDF document text
    • http://rupevapunalude.rf.gd/water_bottling_process.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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eeac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEAC 5496 bytes
SHA-256: a1ec03e1feeff21e67842a6a34b7d94d22d6c5f9625d37f2f5af3afa759fea81
font_01_sfnt_off0001007f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1007F 1800 bytes
SHA-256: a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620
font_02_sfnt_off0001090c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1090C 12872 bytes
SHA-256: ff5f5975386ea7a9a69c6cb3996c52c4be52ff92edb745ac3a13bc1380b39bb6
font_03_sfnt_off000130d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130D9 16312 bytes
SHA-256: 028dbaa76d48ae99b02248bacea50134e27ed131f5dd39e25ac401de8961e19b

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