Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ea8f0fd5428ebb9…

MALICIOUS

PDF

71.2 KB Created: 2021-05-09 08:09:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 98d699f7ac8079f39b3a21ddc4c912e6 SHA-1: 541bfb04d106e1e7355eaec54c04987084760b11 SHA-256: 0ea8f0fd5428ebb9a79508313f53c16db9d2c6e52749685eddb0914e1d61f3c1
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a machine learning classifier and ClamAV, as malicious and likely phishing-related. It contains numerous embedded URLs pointing to disposable domains, suggesting a link farm designed to distribute malicious content or redirect users to phishing sites. The document body, though heavily obfuscated, contains keywords related to a biology textbook, indicating a lure to entice users to click on the malicious links.

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
  • 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://vilenefex.ru/strik?utm_term=cgp+aqa+a+level+biology+textbook+pdf PDF link annotation
    • http://newuwedeza.mypressonline.com/formulaire_vente_voiture_occasion.pdfIn PDF document text
    • https://cdn.sqhk.co/kaxovugefulo/jdicibS/lepomuzatonufewo.pdfIn PDF document text
    • http://gusanod.22web.org/64896308996.pdfIn PDF document text
    • http://wusodopepufex.66ghz.com/bree_serif-_regular.pdfIn PDF document text
    • http://kunepuvobimamin.medianewsonline.com/acute_myocardial_infarction_guidelines_2020.pdfIn PDF document text
    • http://sovumeriwox.mygamesonline.org/xuriditusinikivimijufir.pdfIn PDF document text
    • https://cdn.sqhk.co/rizijuwet/gchcyjb/tribal_tattoos_meaning.pdfIn PDF document text
    • http://wawesoja.sportsontheweb.net/teachers_day_essay_in_bengali_language.pdfIn PDF document text
    • http://gidomepijamasos.iblogger.org/best_daphne_moon_quotes.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kokutefuto.epizy.com/abdominal_physical_examination.pdfIn PDF document text
    • http://tizivedimusos.epizy.com/85410715291.pdfIn PDF document text
    • http://jaxifepuxebadin.epizy.com/62726064861.pdfIn PDF document text
    • http://wipimemawupola.epizy.com/how_much_is_a_used_stihl_chainsaw_worth.pdfIn PDF document text
    • http://tepaduvofevog.rf.gd/71023521202.pdfIn PDF document text
    • http://ridurosumebo.epizy.com/cursive_sentences_practice_sheets.pdfIn PDF document text
    • http://biwomilorawud.rf.gd/wesojosakugezadixovotoze.pdfIn PDF document text
    • http://wojobawezelo.rf.gd/45494100042.pdfIn PDF document text
    • http://purewowesajumu.myartsonline.com/python_data_analysis_practice_problems.pdfIn PDF document text
    • http://mifedisiso.atwebpages.com/acidic_basic_and_neutral_amino_acids.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_off0000d771.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD771 5400 bytes
SHA-256: 0c782e5af8a202f9bec23c960522ce5baea63b0381e37c44d9ca8567c7782f7d
font_01_sfnt_off0000e9ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9EF 10888 bytes
SHA-256: c042772fb033dd85b6de15e89453560b079037d259142ed9257c0b260901d296

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