Malicious PDF — malware analysis report

Static analysis result for SHA-256 69aa01bb51020a0f…

MALICIOUS

PDF

86.0 KB Created: 2021-06-12 06:48:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: eae7a1635b0818d8f877d6558347a2cb SHA-1: d13ae00e0b0ddd420a469f75cdc1fa1ef32d9e1a SHA-256: 69aa01bb51020a0ff1c43cdb49ff41e33ce918c38def81ab51ccfbad4bffad85
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 0.9958

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/123?utm_term=selenium+java+tutorial+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4385020/normal_603b5d2905707.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390371/normal_5fd3b16a8384f.pdfIn PDF document text
    • https://pudixibavumop.weebly.com/uploads/1/3/5/9/135964902/280800.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367650/normal_5fc80dbbbca91.pdfIn PDF document text
    • https://wejapunikiver.weebly.com/uploads/1/3/4/2/134266614/67011a268.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376629/normal_605f30cc4a2b5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474985/normal_60c06898ca274.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475727/normal_6067a76021715.pdfIn PDF document text
    • https://fedonofawok.weebly.com/uploads/1/3/4/8/134881994/11f118ce06.pdfIn PDF document text
    • https://pimidunobesuxig.weebly.com/uploads/1/3/0/9/130970022/vawigelijim_xuzubutibake_dorenamodofeku.pdfIn PDF document text
    • https://rovibabewovel.weebly.com/uploads/1/3/4/8/134884015/rugedetobaji_sirilumenitarik_zosoj_nomub.pdfIn PDF document text
    • https://firulasimasib.weebly.com/uploads/1/3/0/9/130969438/1640197.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370269/normal_5feb4b895caef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503525/normal_6063631580188.pdfIn PDF document text
    • https://tokoposejod.weebly.com/uploads/1/3/1/3/131380771/wibepofova.pdfIn PDF document text
    • https://rigafefabapamum.weebly.com/uploads/1/3/4/4/134486683/26807c8b815.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391314/normal_5fe7dee3bbbeb.pdfIn PDF document text
    • https://vaxejoxumede.weebly.com/uploads/1/3/5/3/135346770/8294469.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bobiginokemo.pbworks.com/w/file/fetch/144752790/84066350034.pdfIn PDF document text
    • http://fuzugimife.pbworks.com/f/zetenaredikigafemowijarom.pdfIn PDF document text
    • http://foxubomo.pbworks.com/f/free_download_hand_lettering_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ef2a60c-2ad2-43b4-97a1-aa7cb786b9f6/metodologia_de_la_investigacion_roberto_sampieri_quinta_edicion.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ba7f6ae-8b50-4cb3-93fe-b4a53f3b9c75/what_recipes_for_keto_diet.pdfIn PDF document text
    • http://wigonewakil.pbworks.com/w/file/fetch/144680214/best_chess_puzzle_book_for_beginners.pdfIn PDF document text
    • http://fepewuwakow.pbworks.com/w/file/fetch/144483843/cover_letter_for_phd_application_in_computer_science.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c2ef1cf-2618-488a-a8d7-57a92fd96412/43499679685.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0a3b8f4-aac6-4b43-afd4-510ed7f41555/octavia_butler_dawn_movie.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_off00010edd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EDD 5248 bytes
SHA-256: 2ec6e3c41c164db46498a42ba673db00e1ae6930b9418a3f0a0f171660b18105
font_01_sfnt_off000120ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120AD 12188 bytes
SHA-256: 238f67594ff07f92d34cbbaf6bc4bea16b482b0e524bcac63c05c31daf5203c0