Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1e80a0c85206241…

MALICIOUS

PDF

80.5 KB Created: 2021-04-19 19:12:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: f3bdaefdca83cdbf3e6eb28cedbd443e SHA-1: 5b3e263c84abed8563fadac4bbdbdc7c9ed6a9ba SHA-256: e1e80a0c85206241141ec60cd824dd0edae96b20bd1e5a9343d0a6f202e8e575
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://mezovuduw.ru/strik?utm_term=what+age+is+the+book+thief+appropriate+for PDF link annotation
    • https://cdn.sqhk.co/vixukose/fOiaDhe/xbox_games_beta_tester.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420014/normal_603e7e640bd82.pdfIn PDF document text
    • https://cdn.sqhk.co/wobuwozavenu/jbjixjb/binalojupuvaforolinama.pdfIn PDF document text
    • https://cdn.sqhk.co/gowalitusiwa/hhjdWNb/ruten.pdfIn PDF document text
    • https://cdn.sqhk.co/vonitumefide/djaiiah/radio_italiane_lista.pdfIn PDF document text
    • http://tepifugamokeg.medianewsonline.com/zavimowubipijuxetote.pdfIn PDF document text
    • https://cdn.sqhk.co/zodavujera/thesrVp/99767737884.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465003/normal_5fe39ed6cd2e0.pdfIn PDF document text
    • http://wulixiv.sportsontheweb.net/90032393671.pdfIn PDF document text
    • https://cdn.sqhk.co/dosakupu/VgfWKsu/which_is_faster_32_or_64_bit_windows.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365642/normal_6056d5e26861f.pdfIn PDF document text
    • https://cdn.sqhk.co/paxabuxutujo/hbgh3gh/52453801030.pdfIn PDF document text
    • https://cdn.sqhk.co/mojupesonon/gejXzgi/hack_para_block_strike_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/sisowufabo/mm7jiLf/crossword_heaven_word_search.pdfIn PDF document text
    • https://cdn.sqhk.co/puvegipuros/fgcY6id/45532588474.pdfIn PDF document text
    • http://mefizilexofe.66ghz.com/ibm_aix_java_sdk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://22fea36a-5e19-4af1-b4aa-fe6e1efe0ee9.filesusr.com/ugd/b5a188_ebe9f46fb069407a8eb7f35803f66f64.pdf?index=trueIn PDF document text
    • https://2e4d99de-9d37-4ce2-abd5-0bbccafdbe51.filesusr.com/ugd/33a2e4_5602f5a828614274a198d8a05b7f0fe5.pdf?index=trueIn PDF document text
    • http://fuvogel.rf.gd/anatomy_and_physiology_for_nursing_and_healthcare_students.pdfIn PDF document text
    • http://nopugorib.onlinewebshop.net/japis.pdfIn PDF document text
    • https://354df738-7a8c-4643-bdcd-aa58f7c4bd0c.filesusr.com/ugd/69cf62_ec03dbbd918a4bb8b260e17dc155aeec.pdf?index=trueIn PDF document text
    • http://zanerem.rf.gd/muroruxikased.pdfIn PDF document text
    • https://e942959e-95af-4115-ab05-a6e38533eaad.filesusr.com/ugd/66f7a0_e88dedf1f7b549169c06ec4ab4a43fdd.pdf?index=trueIn PDF document text
    • http://vugapadilubokis.epizy.com/barbie_princess_charm_school_uniform_costume.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_off0000fb5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB5B 5348 bytes
SHA-256: a351ab77ceb4bcc3b692a124a7447910b1c31e76ae0814c4697586ec60afb7cd
font_01_sfnt_off00010d96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D96 10772 bytes
SHA-256: 8c792b29f9875874c071a8d907217d77279982f3f9bb7b3f0d44fc25819ce945