Malicious PDF — malware analysis report

Static analysis result for SHA-256 7711e75e23d1cc44…

MALICIOUS

PDF

72.2 KB Created: 2021-03-01 18:43:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 10a5c46b4addb7556054c4c82a297c36 SHA-1: b10fcc4651247137ead7b4f6586e83ca2504e47a SHA-256: 7711e75e23d1cc447abd82bbe247f65b787eb055cf4efee171d9cd7640bb3f99
126 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs pointing to various domains, many of which are associated with link farms and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document's primary purpose is to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://kuzutuzo.ru/wb?keyword=boss%20fs-5u%20clone PDF link annotation
    • http://meetsoda.pro/gozibazanagemepusiltelal.pdfIn PDF document text
    • http://it50save.info/yo_antes_de_ti_libroscco6.pdfIn PDF document text
    • http://natusab.22web.org/classical_mechanics_goldstein_solution_manual.pdfIn PDF document text
    • http://activa-fb.com/73430260260pos03.pdfIn PDF document text
    • http://erkutungotu.com/35922242535ugygv.pdfIn PDF document text
    • http://trylait.pro/67823998199wbhly.pdfIn PDF document text
    • http://frukt.fun/pubufiv2bgtq.pdfIn PDF document text
    • http://morj.space/delta27s_key_to_the_toefl_ibt_4th_edition99ml1.pdfIn PDF document text
    • http://islemleriniz.org/what_are_the_benefits_of_using_ipads_in_schoolshodxs.pdfIn PDF document text
    • http://ralugugifoxatir.scienceontheweb.net/john_deere_265_front_end_loader_for_sale.pdfIn PDF document text
    • http://digosige.mywebcommunity.org/zuzizudig.pdfIn PDF document text
    • http://logvoz.ru/756925005674whub.pdfIn PDF document text
    • http://repair-monokoles.ru/mta_the_bronx_ny_10473c2jte.pdfIn PDF document text
    • http://zibinonoja.22web.org/football_manager_2016_wonderkids_centre_backs.pdfIn PDF document text
    • http://rigoditibalun.mywebcommunity.org/nibigoxibuzaseta.pdfIn PDF document text
    • http://mazezoda.22web.org/76979320789.pdfIn PDF document text
    • http://zawugudumi.getenjoyment.net/62611950997.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://denotepisijolib.rf.gd/abb_inverter_100_kw_datasheet.pdfIn PDF document text
    • http://pazatirademe.rf.gd/apkpure_apk_for_firestick.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_off0000dda0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA0 4776 bytes
SHA-256: c0e03d490a9a265035e4e8990586f4a5cc5c3f800b7c628d8fa4b51d1a7e89d5
font_01_sfnt_off0000ee0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE0C 11136 bytes
SHA-256: 0f4e10bbf146753d490d0ad05e4eaefcee93eda29abb3e296804cbe816624958

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