Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c036ac8f0782957…

MALICIOUS

PDF

108.8 KB Created: 2021-03-16 01:28:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 54d22db97da548baf8e7775776545a12 SHA-1: 88dc696b6a43060d443cd0c0580c1f660dc99d00 SHA-256: 2c036ac8f0782957c00e0b811e4f4231a034f5a70587b6ee43b5f99bc4d09b39
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many pointing to disposable hosting or suspicious domains, suggesting a link farm designed to redirect users to malicious content or phishing sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://fokemale.ru/award?keyword=international+biodeterioration+biodegradation+pdf PDF link annotation
    • http://xebepadizupen.22web.org/english_b1_b2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489429/normal_602ca3e6a459f.pdfIn PDF document text
    • https://neruzubegakakew.weebly.com/uploads/1/3/4/0/134017499/4959019.pdfIn PDF document text
    • http://texewofe.22web.org/40307902787.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475217/normal_601e3f0881359.pdfIn PDF document text
    • http://merotudonor.mypressonline.com/kagitoronadugajobemivab.pdfIn PDF document text
    • https://zekaxuwamawebi.weebly.com/uploads/1/3/5/9/135961115/fcf66651f1075.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473030/normal_5fe0243958d72.pdfIn PDF document text
    • http://xenifizonuk.22web.org/57423404860.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://subezonaziw.rf.gd/images_of_matrix_organizational_structure.pdfIn PDF document text
    • http://rujesuluxure.rf.gd/convert_to_word_acrobat_x.pdfIn PDF document text
    • http://lixugafepujijoj.onlinewebshop.net/what_is_network_planning_in_project_management.pdfIn PDF document text
    • http://jaxarafepemu.epizy.com/sheet_music_for_beginners_with_numbers.pdfIn PDF document text
    • http://vofolosozoz.epizy.com/accordi_la_canzone_del_sole.pdfIn PDF document text
    • http://fedatowuka.epizy.com/8707181933.pdfIn PDF document text
    • http://rojolegov.epizy.com/xefujonigexenutuv.pdfIn PDF document text
    • http://fudotebu.epizy.com/xumobolopaxawixovemapog.pdfIn PDF document text
    • http://wikotutagor.epizy.com/pearson_chemistry_textbook_online_free.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_off00016d2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16D2B 5108 bytes
SHA-256: 46193cf2465f4a22920960c68c8905d0a0b7912f333ae2e320d2676b95930603
font_01_sfnt_off00017e93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17E93 11696 bytes
SHA-256: ae8cee18202e0fe2d9ef3a2833b3d912724bc738ddb7f3fd6d56cdc841b37b01

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