Malicious PDF — malware analysis report

Static analysis result for SHA-256 b292ac61e289e66f…

MALICIOUS

PDF

75.7 KB Created: 2021-04-29 23:08:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a41fc6de33c8e64834b83abb68e283b5 SHA-1: 7db54cd2b73a46539454f4563be98079a6cbd722 SHA-256: b292ac61e289e66fa19674e18083a54ac03b0f9084c2148b928098123f52655f
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are likely part of a link farm designed to manipulate search engine results. One prominent URL, 'https://vilenefex.ru/strik?utm_term=how+to+start+off+trading+stocks', suggests a phishing or scam attempt related to stock trading. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://vilenefex.ru/strik?utm_term=how+to+start+off+trading+stocks
    • https://static.s123-cdn-static.com/uploads/4402032/normal_60076f5d00c2f.pdf
    • https://cdn-cms.f-static.net/uploads/4421058/normal_605db389230ea.pdf
    • https://cdn.sqhk.co/totarujined/ijgnVgg/kofogipusalunidaderusiba.pdf
    • https://cdn.sqhk.co/tivanosox/gjhhdjh/vonuwug.pdf
    • https://cdn-cms.f-static.net/uploads/4423780/normal_6020ab87b2f48.pdf
    • https://zesoxomilojul.weebly.com/uploads/1/3/4/0/134018604/dapuwivijokefeki.pdf
    • https://cdn.sqhk.co/vonofuguniti/hqid51k/group_video_chat_free_app.pdf
    • https://nutagabe.weebly.com/uploads/1/3/5/3/135325028/5560208.pdf
    • https://cdn.sqhk.co/lugizumevemu/fjia2hg/hanukkah_trivia_questions_and_answers_printables.pdf
    • https://pedasivu.weebly.com/uploads/1/3/5/3/135387907/3379173.pdf
    • http://tipofeliluget.medianewsonline.com/20909856162.pdf
    • https://kavavori.weebly.com/uploads/1/3/4/0/134012315/5464935.pdf
    • https://static.s123-cdn-static.com/uploads/4368495/normal_5fc851ecc510a.pdf
    • http://gopudumimipabol.mypressonline.com/excel_advanced_skills_writing_workbook_year_6.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/d43988cb-76cc-4416-b760-a86e59ad19fb/property_management_building_inspection_checklist.pdf
    • https://a6132035-7465-4fe4-be4e-2faa96c22dab.filesusr.com/ugd/cf950b_11a521258f954b4aa3559879d35c3069.pdf?index=true
    • https://uploads.strikinglycdn.com/files/341ed8d8-7e69-4d91-bae1-97a16c9de5b4/kumikarisirinorafajadanaf.pdf
    • https://48e4e0df-78ce-4736-8797-27735e68dc67.filesusr.com/ugd/f3b179_e32763df08434f84b1de6de035d6618a.pdf?index=true
    • https://ac614e2c-2e00-43e4-a80f-2c6bce9fb64b.filesusr.com/ugd/f103bb_2ccb19b399644b01b3616fa035cccfc2.pdf?index=true
    • https://d52aed46-be45-4f9b-8106-cf6fc7ee66c0.filesusr.com/ugd/b148e5_99ed85345c0b4f728f579358a4b17bad.pdf?index=true
    • https://uploads.strikinglycdn.com/files/a17da871-e510-4fbe-abb1-1cc34081d301/2_poemas_en_lengua_indigena_y_su_traduccion.pdf
    • https://76c9fb28-c10e-4950-85be-37de24a2ede8.filesusr.com/ugd/fa32a6_74dbb513b28042c6967bdbc8d391c5ea.pdf?index=true
    • https://uploads.strikinglycdn.com/files/040c5814-bbdf-4c5c-a4a5-d1d022330cda/7469796086.pdf
    • https://uploads.strikinglycdn.com/files/d4163305-8cf2-480b-b783-40a6468ae608/95928988817.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8bf.bin
075fddf93156f81b7c85f40f7b29a74bff7cbe457f29fd3be00b7cd98986a6ef		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8BF 5272 bytes
font_01_sfnt_off0000fad3.bin
391b97a24226b44d73bfb2ad4c63e677ec9e38b1390a449e0002bb1514baac10		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD3 11188 bytes

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