Malicious PDF — malware analysis report

Static analysis result for SHA-256 05abdca35aa3f2a0…

MALICIOUS

PDF

80.5 KB Created: 2021-03-16 16:00:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: c33d11f4e61aa1f4d2d93463a976d067 SHA-1: 9555f0d108d5a58ec849c0f227807987df91288e SHA-256: 05abdca35aa3f2a09798f89627f894821984d2459b72387c01b4eb983a00706e
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded links, many pointing to disposable hosting services, suggesting a link farm or phishing lure. The document body, though heavily obfuscated, appears to be a 'gene therapy worksheet', a common lure to entice users to click on the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://nipisod.ru/wix?keyword=gene+therapy+worksheet PDF link annotation
    • https://pejetoli.weebly.com/uploads/1/3/1/4/131454808/f1136a7.pdfIn PDF document text
    • https://wixokaregojes.weebly.com/uploads/1/3/2/6/132681478/4c2b1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384836/normal_600b6cd58be88.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465024/normal_5ff225ecacd98.pdfIn PDF document text
    • http://ewop.space/buxaguxijufuxoresf6vjp.pdfIn PDF document text
    • https://vijopafixav.weebly.com/uploads/1/3/1/6/131636601/misawupavewamu-rosojukekinekun-betuki-senewitesosig.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486745/normal_5ff05d7be9e09.pdfIn PDF document text
    • http://pro-komp-master.website/432340029719yah4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369501/normal_602d1c9f0f077.pdfIn PDF document text
    • http://pro-konditer.com/bemuvubbxka.pdfIn PDF document text
    • https://wexivupesowapab.weebly.com/uploads/1/3/2/7/132712225/numadigudedata-velut-mixewevovese-pukumi.pdfIn PDF document text
    • http://alisabor.design/finalotusunalovuhnanb.pdfIn PDF document text
    • http://sungo1.space/el_negocio_del_siglo_xxi_audiolibro_gratisa57wf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480895/normal_5fe1cd0f87ae8.pdfIn PDF document text
    • http://m-laskin.ru/sony_cd_dvd_player_dvp-sr210p_remote7jsff.pdfIn PDF document text
    • http://discount50it.pro/872751671122nkig.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fabevurubojob.epizy.com/73008159351.pdfIn PDF document text
    • http://dojopugoput.epizy.com/40538404035.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e918.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE918 5164 bytes
SHA-256: b4f843472453372da7be2a429607853c138e1aa8f445e5965a938b3e7480a5a4
font_01_sfnt_off0000fabe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFABE 10816 bytes
SHA-256: 71dce0d80deb77caa70f9c58bb8f682fc33a672852584ae84b9e561bfa6d6d7e
font_02_sfnt_off00011fcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FCB 16144 bytes
SHA-256: 9fd528bdd8c1884a6e15ee1af82f6d8490f5509dabfad6ef60b319b19129b13c

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