Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9855db23874d74d…

MALICIOUS

PDF

62.8 KB Created: 2021-02-13 15:18:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: cb6f8ddf3e05ae9f87faeb72ca10876f SHA-1: 35c56a1b8e0e0f10a26772476aa9703c99d403f9 SHA-256: f9855db23874d74dd0e0ba67f3af17c54113e1dc14b4963bf2a036d0a723f315
96 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of embedded URLs, specifically 'https://seumenha.ru/wix?keyword=vectors+addition+worksheet', suggests a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to trick users into visiting a compromised site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://seumenha.ru/wix?keyword=vectors+addition+worksheet PDF link annotation
    • https://cdn.sqhk.co/bitomasijelo/fAeckgf/moviestarplanet._pl_usa.pdfIn PDF document text
    • https://cdn.sqhk.co/litonesi/DKjfVca/robot_sumo_ev3.pdfIn PDF document text
    • https://cdn.sqhk.co/xawodoze/Hgf6igl/67794885280.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458634/normal_6026fa53e234b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386822/normal_5fd0a2ef083fa.pdfIn PDF document text
    • https://cdn.sqhk.co/bosamame/ige1hhZ/cbc_hockey_playoff_broadcast_schedule.pdfIn PDF document text
    • https://cdn.sqhk.co/gitopedevid/iegfgdb/78547839525.pdfIn PDF document text
    • https://cdn.sqhk.co/jekidase/bhj6hjp/pokeball_plus_sword_and_shield_exp.pdfIn PDF document text
    • https://cdn.sqhk.co/xonepogafix/aCZgfhe/nintendo_switch_online_redeem_code_not_working.pdfIn PDF document text
    • https://cdn.sqhk.co/zimajigon/b3jihjD/69952773508.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/semuxemakaw/gastroparesis_guidelines_uk.pdfIn PDF document text
    • https://s3.amazonaws.com/xasovewipeje/letter_format_for_tc_to_principal.pdfIn PDF document text
    • https://s3.amazonaws.com/votuweroxigezog/multiplying_fraction_problem_solving_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/vekodupiwarobi/technically_correct_but_completely_useless_answer.pdfIn PDF document text
    • https://s3.amazonaws.com/fapaga/vogel_s_approximation_method_problems.pdfIn PDF document text
    • https://s3.amazonaws.com/juzowilipi/bijtelling_auto_berekenen_formule.pdfIn PDF document text
    • https://s3.amazonaws.com/fizaxo/lotiwo.pdfIn PDF document text
    • https://s3.amazonaws.com/rizijubovapuk/elementor_duplicate_header_template.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_off0000ba9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA9C 5116 bytes
SHA-256: a68312b7ad6d885983df955c0d0dfd2dee4f0a9c5f8db0b26d05fb41377c16df
font_01_sfnt_off0000cc14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC14 9956 bytes
SHA-256: e87c4b549ef21e10d03c9923d0e350d5210625e11bc5bcefba7cc8aa6da03f8d

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