Malicious PDF — malware analysis report

Static analysis result for SHA-256 32666a98e8bc50d9…

MALICIOUS

PDF

79.1 KB Created: 2021-03-11 17:29:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 77db2913a06aae1922cf8794a18ee09c SHA-1: 88d7705e132c7bdcbafe5a013cfa589e83956f34 SHA-256: 32666a98e8bc50d9c8b9da59a82723498021991b2b4ccbeb22281f89839d18cd
184 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics, including a critical finding for a link to known malicious redirector infrastructure. The ML classifier also assigned a high probability of maliciousness. The embedded links, such as the one pointing to 'yafferge.ru', are designed to lead users to potentially harmful sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=what+are+good+technical+skills+to+put+on+a+resume In PDF document text
    • http://ravovenovibu.medianewsonline.com/motutanugafep.pdfIn PDF document text
    • http://vasakuso.sportsontheweb.net/gemut.pdfIn PDF document text
    • http://kijuguwosaxo.22web.org/88717979545.pdfIn PDF document text
    • http://zetumitufam.mywebcommunity.org/wonujoxavegej.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lojabupabavize.onlinewebshop.net/compact_showtime_rotisserie_and_bbq_oven_accessories.pdfIn PDF document text
    • https://288dffde-0386-48bd-adba-b069b5f3b70f.filesusr.com/ugd/7e1b39_014f9de68ed3408fa94c54bad0b4dfb5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8fcae37-4cfd-4dce-a289-f3d4709079b8/davodaguroxonejujeg.pdfIn PDF document text
    • http://gixarewujedel.atwebpages.com/72587748450.pdfIn PDF document text
    • https://s3.amazonaws.com/minegikukovel/bts_album_answer_version_l.pdfIn PDF document text
    • https://c96d0889-97fb-4213-90a4-a08ae01970e6.filesusr.com/ugd/ed32f2_e6ce3f84faba4df098b3ef8519a75020.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/59795142-718f-4d55-b273-30084f3deda6/american_history_x_netflix_edited.pdfIn PDF document text
    • http://nozabikuj.rf.gd/tom_clancys_jack_ryan_season_1_cast.pdfIn PDF document text
    • https://s3.amazonaws.com/lekelepowo/kurepelapujitizenakape.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ed7787a-72ff-4edf-85bd-bafc88f3cf42/what_is_the_best_known_greek_art_form_today.pdfIn PDF document text
    • https://s3.amazonaws.com/xonaxevetaf/6226309657.pdfIn PDF document text
    • http://bumurulepowele.myartsonline.com/bsc_first_year_physics_practical_book.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_off0000f724.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF724 5564 bytes
SHA-256: 29dd282a16c44c51bacd0803fbca17418d2a009671a9c18eca55843068d346fd
font_01_sfnt_off000109f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109F5 11044 bytes
SHA-256: 5c7f8b1b4c4f266e8b89d1b90f7dd94d6c6520ae722b1e40291df9ef91e1a7f5

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