Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd80d0b52d027d65…

MALICIOUS

PDF

86.8 KB Created: 2021-03-18 23:44:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 4812fc792f908f72e6e4f51c9427cdcd SHA-1: b42cc096a4d78f76cfe5b360823a4daa1c3eddb1 SHA-256: dd80d0b52d027d65dbc438eb42df81badfb6fe0a44fab5d47f981de06448f302
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and ML classifiers indicated high maliciousness. It contains a large number of embedded external links, with one heuristic specifically identifying it as a 'PDF_SEO_LINK_FARM'. The primary URL, 'https://kuzutuzo.ru/wix?keyword=baby+daisy+mario+kart+wii+unlock', suggests a lure related to search engine optimization or keyword stuffing to attract unsuspecting users. While no scripts were explicitly extracted, the nature of the embedded links points towards a phishing or malicious redirection attack.

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/wix?keyword=baby+daisy+mario+kart+wii+unlock PDF link annotation
    • http://fruit-ita.fun/calendario_septiembre_2020_para_imprimirtnqby.pdfIn PDF document text
    • https://repemokalit.weebly.com/uploads/1/3/1/8/131856723/lamelom.pdfIn PDF document text
    • http://foyou.store/libro_cual_camino_gratist4gl9.pdfIn PDF document text
    • https://lerofiputa.weebly.com/uploads/1/3/4/3/134367001/5652a5927d.pdfIn PDF document text
    • http://littlenat.space/fidiwemoxafufajenoiflmp.pdfIn PDF document text
    • http://osmosiotzs.fun/fasimori3qxwv.pdfIn PDF document text
    • http://rilomenininun.getenjoyment.net/16147546726.pdfIn PDF document text
    • https://fijogukovope.weebly.com/uploads/1/3/1/3/131379832/veraxola.pdfIn PDF document text
    • http://fb-ig-copyright.com/doctors_in_jackson_mi_that_accept_medicaidkzgw7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://watusatuvor.myartsonline.com/all_antibiotics_list.pdfIn PDF document text
    • https://s3.amazonaws.com/zonivezada/84503815350.pdfIn PDF document text
    • https://s3.amazonaws.com/ladojenefe/kedetakugusagi.pdfIn PDF document text
    • https://s3.amazonaws.com/setikizo/what_are_the_3_levels_of_organization.pdfIn PDF document text
    • https://f499a9ea-5579-4d3c-a180-ba191067f9b7.filesusr.com/ugd/34ec99_a5fe94348ffd4eeb9dbdbd19b288d208.pdf?index=trueIn PDF document text
    • https://5de6e22f-064f-4859-b003-4eaa502c5056.filesusr.com/ugd/2609e6_4658883688c94230b6c49b037284d770.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/purixifusipelid/42360052488.pdfIn PDF document text
    • https://s3.amazonaws.com/levovod/doodle_alchemy_game_answers.pdfIn PDF document text
    • https://cff07a16-13b2-455b-8a78-148a75b158b4.filesusr.com/ugd/cda0c7_c226ca826168480cb56e9407597a3e59.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gomakobez/26853090862.pdfIn PDF document text
    • https://f06ae689-34e6-4fd9-b749-a5985747e370.filesusr.com/ugd/4117a9_d9fa34e44fe549a18855beba6b3759c1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/posufij/months_of_the_year_worksheets_kindergarten.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000107d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107D1 5296 bytes
SHA-256: 309d929a0ba85e28a89556325e384abb1f57d70b89affa164495e2478a6a42e4
font_01_sfnt_off000119c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119C5 11260 bytes
SHA-256: fc8f791940268e65f37ffd0d665a34d39e399da6740298ff8534ac185c1c8175
font_02_sfnt_off00013f62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F62 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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