Malicious PDF — malware analysis report

Static analysis result for SHA-256 193042d8b47f660e…

MALICIOUS

PDF

77.2 KB Created: 2021-03-11 19:53:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 00ac04aaa157d37e0471cd5dc707c5de SHA-1: c0001183cf99db4cba1e2a253124abfefcfdb9eb SHA-256: 193042d8b47f660e19a11cf93db5cb40490867a22b811e3f886ada32cfebbc3e
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, contains metadata related to 'wkhtmltopdf' and a URL query parameter, reinforcing the lure of educational material to mask malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://lozipotod.ru/123?utm_term=sociology+a+level+education+pdf PDF link annotation
    • http://domavera.ru/77165189412h1u3q.pdfIn PDF document text
    • http://fovagenifozemub.iblogger.org/1st_birthday_invitation_templates_photoshop.pdfIn PDF document text
    • http://rigekuxinitevov.iblogger.org/zogituviguwelumenomed.pdfIn PDF document text
    • https://cdn.sqhk.co/fexejikexew/h1Sija7/39600139510.pdfIn PDF document text
    • http://metazoaapc.fun/strongs_concordance_vines_dictionaryxuod5.pdfIn PDF document text
    • https://cdn.sqhk.co/fanabezom/jehghck/26900325004.pdfIn PDF document text
    • https://cdn.sqhk.co/zunesunatiri/gjHhcbD/napogu.pdfIn PDF document text
    • http://islta.fun/mujusuzapexizrdc8m.pdfIn PDF document text
    • https://cdn.sqhk.co/wafixagi/iiehiM1/free_bubbles_vector.pdfIn PDF document text
    • https://cdn.sqhk.co/livefivepa/jiJybGd/fox_theater_banning.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wevikokuzufos.epizy.com/business_model_template_ppt.pdfIn PDF document text
    • http://lofekelatek.epizy.com/radisopototurugozuk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7924a351-ce04-4a88-8e19-8a9bfbaca3d2/oracle_sql_loader_tutorial_for_beginners.pdfIn PDF document text
    • http://kinabufosusipa.epizy.com/tifibuwapazi.pdfIn PDF document text
    • http://zewipurorafe.epizy.com/53676756954.pdfIn PDF document text
    • http://gijodege.epizy.com/bezusepisusobifijomuk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb46fd32-cdb8-42eb-84c6-78cb4d64ed9b/zexitepotibuzogidiguzal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1cb47deb-1693-49a6-841e-ea39d6c70573/brandy_melville_near_me_arizona.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9171567-81d1-4e6e-a519-26d6da2c9abc/personajes_de_perdona_si_te_llamo_amor_espaa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11184d9e-2569-407a-a352-b9ac215a5c91/bebazagudinovukuze.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9178210-c7c5-4fed-81b5-ac4ccdeee607/57051002151.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4b32b64-f83c-4169-b0d8-d5b3962c9e4e/kubota_engine_spare_parts_dealer_in_india.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF1B 5312 bytes
SHA-256: 091912d7624d785d3f548efcb5f503034c2f9bbe0304c70e2cdf511849071986
font_01_sfnt_off0001015b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1015B 11248 bytes
SHA-256: 0fe6bf460aa5fe2d6d6cb5611db1dfe84ed9bd3fa8fd5e8227e7129990f9efd8

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