Malicious PDF — malware analysis report

Static analysis result for SHA-256 66d23f7228303c9b…

MALICIOUS

PDF

74.6 KB Created: 2021-03-15 00:25:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 3aba10a3f4b56fa2778b21b18906e70b SHA-1: b883f431ff2a38b3ca46b6a81a34c474cd50b5bb SHA-256: 66d23f7228303c9b2b26260d67171cacc7b85690e0279449d010cc5f5f5e324d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9999

Heuristics 5

  • 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 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://lozipotod.ru/123?utm_term=adnet+information+systems PDF link annotation
    • http://luchdobro.site/taguxafesopiluwikbbi0x.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467612/normal_6031e3dbee8aa.pdfIn PDF document text
    • http://skidki-day.shop/best_american_ninja_warrior_runskhq0l.pdfIn PDF document text
    • http://vajogeboru.iblogger.org/85033805520.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382793/normal_5ff28fe49b292.pdfIn PDF document text
    • http://idealslimitaly-ufficiale.site/cambridge_latin_course_book_1v7wsz.pdfIn PDF document text
    • http://nefritthebestthing.site/jonekobogemabosokodq8ya.pdfIn PDF document text
    • http://mupogizarazo.iblogger.org/tn_forest_exam_questions_and_answers.pdfIn PDF document text
    • http://cadenalia.com/23805561833y5rfa.pdfIn PDF document text
    • http://fionainthefield.org/wakutajq3ggx.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tujuzenu.epizy.com/romeo_and_juliet_detailed_summary.pdfIn PDF document text
    • http://serezisegani.rf.gd/35066366627.pdfIn PDF document text
    • http://segisubab.epizy.com/xalikevenarexudozubu.pdfIn PDF document text
    • http://pivirujifija.epizy.com/16135498357.pdfIn PDF document text
    • http://jixadatisaxifid.rf.gd/free_multiplication_coloring_sheets_4th_grade.pdfIn PDF document text
    • http://mimugewezis.rf.gd/wejibamera.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_off0000e298.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE298 5112 bytes
SHA-256: 3f93e65b49f45af3015c464a9f65451f552a265f961caa7722efa45526bc8fd5
font_01_sfnt_off0000f3ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3ED 11908 bytes
SHA-256: c4ccafcfed695e18dc859dec8889ceac0f40e6ead83b35d153b73ffe81593847