Malicious PDF — malware analysis report

Static analysis result for SHA-256 008735d529aed243…

MALICIOUS

PDF

93.0 KB Created: 2021-04-24 09:57:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 185556aef5cd30044a5122a595a790f5 SHA-1: 75f5c7b86282fdb754e6158b7a09004f877df4b6 SHA-256: 008735d529aed2439828ee7278c4349757e2e8d73ef76c2e95edc405ae525ced
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for SEO spam or phishing campaigns. The heuristic PDF_SEO_LINK_FARM specifically indicates a mass of external links, with one prominent URL pointing to a site related to medical Spanish certification. ClamAV also detected this file as a Pdf.Phishing.Trojan, reinforcing the malicious intent. No scripts were extracted, but the overall structure and link farm suggest a malicious document designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://leonvi.ru/strik?utm_term=how+to+get+certified+in+medical+spanish PDF link annotation
    • https://cdn.sqhk.co/pumopijaku/ogigjbc/to-_do_list_task_reminder.pdfIn PDF document text
    • https://cdn.sqhk.co/pekobenew/cOVsgqT/93384621467.pdfIn PDF document text
    • http://nufemewi.iblogger.org/java_application_programming_interface.pdfIn PDF document text
    • https://cdn.sqhk.co/leguzufaju/chChhh5/28165843384.pdfIn PDF document text
    • https://cdn.sqhk.co/letareximo/sshcQhf/vazoroputejosin.pdfIn PDF document text
    • https://cdn.sqhk.co/satukevaguka/aBianhf/nipefolesevipapi.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
    • https://s3.amazonaws.com/paxunu/66935792544.pdfIn PDF document text
    • https://0c2a99dd-71fd-4a0d-b96f-672cfa785c21.filesusr.com/ugd/515c54_a3c7b239b63b493c97c03857d3e46d57.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mizeteb/definition_of_literature_by_scholars.pdfIn PDF document text
    • https://dbb1fad9-9c05-458f-9e32-bc0b7f65d7ec.filesusr.com/ugd/451461_90e80e5625df41979769604bc6a924d8.pdf?index=trueIn PDF document text
    • http://tabojiterakan.rf.gd/zemonotizufugez.pdfIn PDF document text
    • https://s3.amazonaws.com/foneniz/american_pageant_history_book.pdfIn PDF document text
    • https://s3.amazonaws.com/suxuzubojut/ludedasuxowasod.pdfIn PDF document text
    • https://s3.amazonaws.com/gonasidupij/hurt_feelings_report_construction.pdfIn PDF document text
    • https://s3.amazonaws.com/gelawiweza/happy_wheels_full_version_for_pc.pdfIn PDF document text
    • https://d64d5b41-a66a-4b78-b87f-0feaf8e9cf76.filesusr.com/ugd/cf1aed_7849d33eab0d4730af740ace94914be5.pdf?index=trueIn PDF document text
    • http://kukipugewogedid.rf.gd/12th_zoology_practical_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/zikeko/joxamukikugegejujajujag.pdfIn PDF document text
    • https://44bb6ee8-a0fe-4f72-890f-0f0a2fec05cf.filesusr.com/ugd/b65acf_2d42de8258464b21ad582b6f8a4f2760.pdf?index=trueIn PDF document text
    • http://bofujenarabi.rf.gd/30104445937.pdfIn PDF document text
    • http://mukoxegolada.epizy.com/facebook_video_er_for_iphone_8.pdfIn PDF document text
    • http://midelex.epizy.com/calendario_2020_com_feriados_portugal.pdfIn PDF document text
    • https://ececae0b-1312-4a4c-959a-117928b3d478.filesusr.com/ugd/e6721e_513ed6a9002642d2bc3d7a53481a56d6.pdf?index=trueIn 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_off00011fa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FA4 5412 bytes
SHA-256: 7d7727c4d983beb469235a44e1ab7f9ed39a6ddc4f7b90265a150c12ec45b8f3
font_01_sfnt_off000131eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131EB 11108 bytes
SHA-256: bea243ec55c55554df5806a4d0c50f95f494dc92b23560324ba82c22c948e0fb
font_02_sfnt_off000157b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157B5 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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