Malicious PDF — malware analysis report

Static analysis result for SHA-256 d331d91113db6fe0…

MALICIOUS

PDF

74.4 KB Created: 2021-04-01 09:09:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: b202f5c790b014f9b1e21c126c6b7757 SHA-1: b0f6377a186e97d6f49c68f8417818d690f51063 SHA-256: d331d91113db6fe0334b316c525abf44b983738ac6c7cbf0d226e8bf739bfef8
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful sites.

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://bologen.ru/123?utm_term=blue+devils+brass+audition+packet+pdf PDF link annotation
    • http://zawubitukete.22web.org/banunga_mein_hafiz_e_quran.pdfIn PDF document text
    • https://lidovoji.weebly.com/uploads/1/3/4/3/134313359/b7996af.pdfIn PDF document text
    • https://rirenumu.weebly.com/uploads/1/3/4/8/134884077/vunafifaguwupopevu.pdfIn PDF document text
    • https://xewomilofapo.weebly.com/uploads/1/3/4/8/134878854/losugorigelogex_kexopupikesolaj_luzodatukop_zovekifur.pdfIn PDF document text
    • https://tupusedaluniji.weebly.com/uploads/1/3/0/7/130738871/1881344ca93.pdfIn PDF document text
    • http://nabizutun.iblogger.org/vosukisiwojepizovesagiw.pdfIn PDF document text
    • https://gutinevar.weebly.com/uploads/1/3/4/6/134611255/8932780db7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kikujebi.epizy.com/8957325232.pdfIn PDF document text
    • http://zonusaminotupe.epizy.com/98320939495.pdfIn PDF document text
    • https://s3.amazonaws.com/mefadedosuw/netflix_apk_mod_premium_2018.pdfIn PDF document text
    • http://vupikefugogulup.epizy.com/takeuchi_tl8_manual_regeneration.pdfIn PDF document text
    • http://vitafunajubala.rf.gd/hindu_arabic_to_roman_numerals_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/kefodek/puliwetopugewogow.pdfIn PDF document text
    • http://gabepan.epizy.com/caderno_de_caligrafia_para_imprimir_5_ano.pdfIn PDF document text
    • http://xodolipifonabo.epizy.com/cancionero_cristiano_evangelico.pdfIn PDF document text
    • http://defozuwonig.rf.gd/living_by_the_book_workbook_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/fofeguj/business_card_template_size_uk.pdfIn PDF document text
    • https://s3.amazonaws.com/kotenu/lafodo.pdfIn PDF document text
    • http://fopopas.epizy.com/watev.pdfIn PDF document text
    • http://bopunuzas.rf.gd/8885574074.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_off0000e2d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D8 5460 bytes
SHA-256: db39155785a2eae76c83f6d46a764899a5bcfe3355ce0c0a7266d70f021a338e
font_01_sfnt_off0000f580.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF580 10840 bytes
SHA-256: 456b4ba0d05a422348d0db95b22e44d5f073d9e4b9fa4e871f57f2fc9ed1fdfb

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