Malicious PDF — malware analysis report

Static analysis result for SHA-256 90915e373a0c18bb…

MALICIOUS

PDF

72.8 KB Created: 2021-03-20 16:30:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: da65ddc4e2d1ca931e4e7632708c8538 SHA-1: 9b6c7e6416a2af16f5afc64e2080f654d6156373 SHA-256: 90915e373a0c18bb80b1c004bfbab27cb5d6809695871bd8f6de85eaa1449af8
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to potentially malicious content. The embedded URLs, such as 'https://nipisod.ru/wix?keyword=organelles+in+eukaryotic+cells+worksheet+quizlet', are likely part of this redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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=organelles+in+eukaryotic+cells+worksheet+quizlet PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4388065/normal_5fe8a73b2ffca.pdfIn PDF document text
    • https://kujunegisim.weebly.com/uploads/1/3/1/3/131380440/6029743.pdfIn PDF document text
    • https://wederubumojap.weebly.com/uploads/1/3/5/3/135393822/5c30aaa9bc5.pdfIn PDF document text
    • https://sogatetemurus.weebly.com/uploads/1/3/4/3/134379625/858cb823110b.pdfIn PDF document text
    • https://cdn.sqhk.co/jigitovewuk/dgiBgcD/31755549032.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411001/normal_5ff097ad4773e.pdfIn PDF document text
    • https://cdn.sqhk.co/givifevulo/ie4CgKG/alto_s_adventure_wingsuit_how_to_use.pdfIn PDF document text
    • http://form-lnstagramverifiedbadges.com/86325932078f3iyb.pdfIn PDF document text
    • http://legiontry.online/99584745909wtv8y.pdfIn PDF document text
    • https://cdn.sqhk.co/zaweniwefi/UpXiehi/cara_tukar_voucher_game_max_telkomsel.pdfIn PDF document text
    • http://copytoshka.ru/6105050115of678.pdfIn PDF document text
    • https://vefekigut.weebly.com/uploads/1/3/4/3/134391246/sesurugusutiza_nijikoroxe_vadirelumos_ligareziz.pdfIn PDF document text
    • https://cdn.sqhk.co/xivomojuf/zgjijia/top_travel_bucket_list_ideas.pdfIn PDF document text
    • https://cdn.sqhk.co/vegedusovo/H0hgect/call_break_multiplayer_card_game_download.pdfIn PDF document text
    • https://cdn.sqhk.co/jotepomi/Pgjgijd/temukinonelitokajebasu.pdfIn PDF document text
    • http://copyrighytsupport.com/vigifulanufiwazattflr.pdfIn PDF document text
    • http://toportt.online/how_to_pair_jabra_elite_65t_with_windows_10fmd9p.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wivunonovef/luvematavezuxaro.pdfIn PDF document text
    • https://s3.amazonaws.com/watajive/31006332439.pdfIn PDF document text
    • https://s3.amazonaws.com/mefovu/xuwilokigukataga.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_off0000e17b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE17B 5524 bytes
SHA-256: de508642060079c75367bd8dfc0794be9417cee8325f0693a24bac40a62d4c27
font_01_sfnt_off0000f463.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF463 9804 bytes
SHA-256: 1b1a0dce4115389c743809d36ab6e8461d370349c2ad5698002c7ec0f7641608

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