Malicious PDF — malware analysis report

Static analysis result for SHA-256 86f1bd39b253b55c…

MALICIOUS

PDF

80.8 KB Created: 2021-05-12 02:17:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: cb3273feb8c64623c4beb6d814c2bf92 SHA-1: 648b28b54fd8c462c5b93810c33cb2d776de0138 SHA-256: 86f1bd39b253b55c8fead4a8910028d7ad1fe718ae1392d1cf8631c3039b54b4
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a malicious intent to host or redirect to malicious content. The ML classifier and ClamAV detection further confirm the malicious nature of the file, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://xajibur.ru/strik?utm_term=health+economics+graduate+jobs+uk PDF link annotation
    • http://lebizifijafaxim.medianewsonline.com/scag_turf_tiger_2_for_sale_near_me.pdfIn PDF document text
    • http://retys.fun/rolerofatafuxi802ui.pdfIn PDF document text
    • http://carinsusa.info/spectrum_math_workbook_grade_8_free92cvz.pdfIn PDF document text
    • http://casbah2point0.com/voucher_game_telkomsel_gamesmaxrrr9s.pdfIn PDF document text
    • http://tesuzaro.22web.org/punuxa.pdfIn PDF document text
    • http://duvevonisupobav.22web.org/fejufevimulufonora.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380525/normal_606a3d054facd.pdfIn PDF document text
    • http://foodguideblog.com/tamilanda_tamil_stickers_wa_status_wastickerappsjnzb1.pdfIn PDF document text
    • http://pitikudefojeken.getenjoyment.net/muwoxifafegujuna.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451760/normal_603f4ba418fd1.pdfIn PDF document text
    • http://medway24.com/51453245602oekz6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448740/normal_6054b1b5ca819.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485828/normal_5ff2a5a23abf3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://64f1e6a9-4530-4009-9f9b-67b91dd69f79.filesusr.com/ugd/76b6de_9bd5577ed81647bd9a4aaf0e72bc458d.pdf?index=trueIn PDF document text
    • http://wuvopopimuwes.rf.gd/how_many_hours_of_dvr_with_xfinity.pdfIn PDF document text
    • https://6e229dea-1f83-4be8-8cd3-388eabd4f5e3.filesusr.com/ugd/1cfe37_559e3d4c2466483a837d7f90979a3e0c.pdf?index=trueIn PDF document text
    • http://xekapakifujekem.onlinewebshop.net/10th_class_biology_book_in_urdu_download.pdfIn PDF document text
    • https://s3.amazonaws.com/jumedemimo/pdf_akreditasi_universitas_terbuka.pdfIn PDF document text
    • https://01c19f78-c7d0-441a-b56a-8672493f87de.filesusr.com/ugd/9d66c7_74550664005d458fb06cadef7e415e6c.pdf?index=trueIn PDF document text
    • https://50aad03f-9d2a-47e6-be13-abd12f321b17.filesusr.com/ugd/3fd638_fd2ac3b92725465db45884fe6d915c7f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mujevubutukoxu/anker_ultra_thin_keyboard_cover_for_ipad_air_2.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_off0000fc0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC0B 5596 bytes
SHA-256: 287d9a88ff353c68c09297ca8d127e00aa18d2bdb198475f73264a852983153c
font_01_sfnt_off00010edd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EDD 11516 bytes
SHA-256: 0b38d6451b7793c4ccb6ed39ec4975343dbcb5a52a2c41fbeaf096f28c90d780

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