Malicious PDF — malware analysis report

Static analysis result for SHA-256 de39e4b3bef7dd13…

MALICIOUS

PDF

88.8 KB Created: 2021-03-18 19:47:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 372f97ad97b5cae49443ee7f4836adbd SHA-1: 854203a461b701b3e226b829dede81fc40790bbd SHA-256: de39e4b3bef7dd130269b78d0cb68c588bafcddafe64d37808fb33b326add78f
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a primary focus on 'fokemale.ru', suggesting a phishing or redirection attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for link farms, further supporting malicious intent. The ML classifier and ClamAV detection strongly indicate this PDF is malicious, likely serving as a lure to a phishing site or a downloader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://fokemale.ru/wix?keyword=julius+caesar+exam+questions+and+answers PDF link annotation
    • http://lomirefuw.iblogger.org/what_to_do_when_your_garbage_disposal_is_clogged.pdfIn PDF document text
    • http://bufezipuduxev.mywebcommunity.org/39817797324.pdfIn PDF document text
    • https://cdn.sqhk.co/novigigexuxo/GLsgiij/concierto_cadena_100_madrid_2020_entradas.pdfIn PDF document text
    • https://cdn.sqhk.co/kixobaza/YggheZv/cute_short_acrylic_nails_for_10_year_olds.pdfIn PDF document text
    • http://dajobod.getenjoyment.net/how_do_you_write_a_250_word_essay_about_yourself.pdfIn PDF document text
    • http://bimovixexena.scienceontheweb.net/57658167607.pdfIn PDF document text
    • http://sozefavi.22web.org/cfa_level_1_study_planner_excel.pdfIn PDF document text
    • https://cdn.sqhk.co/jivonaxadu/Nhbgihe/rales.pdfIn PDF document text
    • http://kifisafobubupo.mygamesonline.org/how_to_use_a_multimeter_to_test_continuity.pdfIn PDF document text
    • http://talemine.getenjoyment.net/lokidewafukusanomilu.pdfIn PDF document text
    • https://cdn.sqhk.co/fuluzezufe/igVQjaB/ben_10_games_free_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/numiwuzuwix/gggdhcS/37710406368.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://dabesajunelazul.rf.gd/37064064084.pdfIn PDF document text
    • http://zelibigevuloxuj.epizy.com/49797468021.pdfIn PDF document text
    • http://lodibepaw.epizy.com/alteryx_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5af0d35-e699-4592-9583-35ea0c757d08/72493260403.pdfIn PDF document text
    • http://karifopiti.epizy.com/cahier_de_vacances_francais.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7990aa1-cf81-4a00-9df1-a35a63f58bf3/which_is_better_kung_fu_or_tai_chi.pdfIn PDF document text
    • http://mowipube.epizy.com/job_application_form_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f31e398f-09ed-4e4d-9aaf-2d0216ff0723/honda_rebel_500_for_sale_craigslist.pdfIn PDF document text
    • http://tozibuxadotoba.epizy.com/nifewitujisuvomugadunot.pdfIn PDF document text
    • http://nisexugolozefa.rf.gd/33979831741.pdfIn PDF document text
    • http://titaleze.rf.gd/rejodosupiru.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000110e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110E0 5240 bytes
SHA-256: 95fdd76bccc84dcf6f67f0e7618fdeee8baeede849e04c99fc901f65de28a3f3
font_01_sfnt_off000122a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122A4 10660 bytes
SHA-256: 2676cf2b20fc2f131603057cae6522ec066d9a7e277e976ae23ccd205e94c842
font_02_sfnt_off000146df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146DF 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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