Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8c322e1cbd1be61…

MALICIOUS

PDF

82.8 KB Created: 2021-04-01 21:16:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 020a028307823f83a742d2fc2ec772da SHA-1: 364824008f8ec4e2030969e6d81cf67b7b2b078c SHA-256: f8c322e1cbd1be61e95706e4d102d6595e0c33c5808273b14090a19e82d4fc86
126 Risk Score

Malware Insights

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

The PDF file contains embedded URLs that redirect to a link farm, a common tactic for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or trojan delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to redirect the user to malicious content, potentially leveraging a PDF exploit or social engineering.

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://pelibifir.ru/award?keyword=sql+server+interview+questions+pdf PDF link annotation
    • http://lugodapamaj.mygamesonline.org/lopaxezobuwawavafivebib.pdfIn PDF document text
    • http://rupaduwovuw.getenjoyment.net/potaxufibanaligumobut.pdfIn PDF document text
    • http://bhd-management.space/loyalty_card_meaning_in_english4rjfy.pdfIn PDF document text
    • http://sparzha.club/18737018651yligo.pdfIn PDF document text
    • http://roman-holidays.shop/project_report_on_emission_control_techniquesjxa0k.pdfIn PDF document text
    • http://mogimetekojubar.scienceontheweb.net/8496118979.pdfIn PDF document text
    • http://reawont.online/here_i_am_lord_mp3_song_downloadrkk84.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391915/normal_601904b86f515.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386076/normal_6028876251ae7.pdfIn PDF document text
    • http://derilezin.sportsontheweb.net/nododowoxakozasilumus.pdfIn PDF document text
    • http://form-lnstagramcopyrightservice.com/3388069188503uch.pdfIn PDF document text
    • http://jixazepo.mywebcommunity.org/21668484525.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416671/normal_6004e807596b2.pdfIn PDF document text
    • http://lovewaits.ru/how_to_replace_a_magnetron_on_a_microwavevi580.pdfIn PDF document text
    • http://repaircreditscore.info/mekonugaruqgf9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380395/normal_5ffac1a81272c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kopolug.myartsonline.com/where_does_the_keurig_water_filter_go.pdfIn PDF document text
    • http://limoxukuk.atwebpages.com/download_buku_belajar_bahasa_thailand.pdfIn PDF document text
    • https://bac325b5-3710-4a60-ba01-c1ac5e8a7650.filesusr.com/ugd/c111de_12e6430604bc4fdfa28105d527ec4b74.pdf?index=trueIn PDF document text
    • https://033a7475-7ccb-45c1-8f1e-38fd320d48d0.filesusr.com/ugd/03a576_a24ddd7ad0db461e9e19bcd74e421bc8.pdf?index=trueIn PDF document text
    • https://e192e36c-395d-4660-9df6-aa7aed00c30a.filesusr.com/ugd/3aee12_c860c74ff60744148ae4acb72157d8cb.pdf?index=trueIn 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_off00010686.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10686 5204 bytes
SHA-256: f70fb7354f83c8e0f547924a193d724dde425d6219f8f228690e323669cd6cbc
font_01_sfnt_off00011861.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11861 11052 bytes
SHA-256: 6a5ad6abe89b4d237a88431cbf0feac4f3b36d714ae571ec4c3f7fe1d4b828a1

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