Malicious PDF — malware analysis report

Static analysis result for SHA-256 21892760309a4715…

MALICIOUS

PDF

77.5 KB Created: 2021-03-30 08:52:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: be2728abbd9baa825d6f830223cf4ce2 SHA-1: ccc1a1db7b16e187d4d4181f6e3821a835420529 SHA-256: 21892760309a47152db310d04993de7f85098747e771690d654b970a22845f3f
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document contains a large number of embedded URLs, many hosted on disposable domains, suggesting a phishing or malware distribution campaign. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://kuzutuzo.ru/strik?utm_term=does+costco+carry+sodastream PDF link annotation
    • https://cdn.sqhk.co/ramawuvade/hyhhgjN/traces_justification_report_excel_utility.pdfIn PDF document text
    • http://lomilinixigal.mypressonline.com/7266123330.pdfIn PDF document text
    • https://gokixojegesefa.weebly.com/uploads/1/3/4/8/134864476/97428ac33ab07.pdfIn PDF document text
    • https://cdn.sqhk.co/zivugeri/gf55Mje/gazatenoz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478137/normal_6022d7b9666a6.pdfIn PDF document text
    • https://cdn.sqhk.co/pefatipi/fgjiagi/dragon_ball_advanced_adventure_download_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454547/normal_6036a007e6728.pdfIn PDF document text
    • http://nagesebaz.iblogger.org/simple_future_tense_will_and_shall_worksheet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476301/normal_6026e9b895b27.pdfIn PDF document text
    • https://cdn.sqhk.co/malevevipali/wmkILje/32747652326.pdfIn PDF document text
    • http://rewetuxavix.mypressonline.com/blank_sheet_music_large.pdfIn PDF document text
    • http://tebeririz.scienceontheweb.net/lipulelababunudi.pdfIn PDF document text
    • https://bubunixijasebed.weebly.com/uploads/1/3/1/4/131407035/527194.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369331/normal_602a04e6bf1b6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tewalilakoj.rf.gd/hindu_baby_boy_names_starting_with_n_download.pdfIn PDF document text
    • http://jujageritoxo.atwebpages.com/ragiwitoj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5dac37a1-6e3e-4c2a-98df-16ee472d8f12/visualization_analysis_and_design_tamara_munzner_free_download.pdfIn PDF document text
    • http://tivewigaviris.rf.gd/98759814405.pdfIn PDF document text
    • http://febagilelefejen.epizy.com/banking_chronicle_november_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/934bc03d-083e-4827-ac71-afcef93c861f/where_to_buy_ekornes_stressless.pdfIn PDF document text
    • http://tagijonegularol.myartsonline.com/vaxebamuwifugugot.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_off0000f03e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF03E 5152 bytes
SHA-256: 91f6d09a298388a52e50404e9b06875e3ac04991830a999810bbaaabb6a8443d
font_01_sfnt_off000101bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101BF 11280 bytes
SHA-256: af87bd421998992c9a4a240a8edcf30a515c0d381463604d21708b033ec635fa

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