Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8a15dea2504e2f8…

MALICIOUS

PDF

79.5 KB Created: 2021-04-06 07:35:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 9f0328b6f8f6554fb568e6e5ad1e3b98 SHA-1: 2d120630c910041c5ac584bec0884405c08b0a66 SHA-256: a8a15dea2504e2f8614cd53fa8ad722d1933c67928522f6dc1f54fe4d7c043cc
96 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating embedded URLs and is flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The document body, though heavily obfuscated, contains text related to compound interest, suggesting a lure to disguise the malicious intent of directing the user to external URLs. No scripts were extracted, but the presence of external URIs points to a phishing or credential harvesting attempt.

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://bologen.ru/strik?utm_term=how+to+calculate+the+years+in+compound+interest PDF link annotation
    • https://roxuxafuz.weebly.com/uploads/1/3/0/8/130813852/7a0385deaccc6b.pdfIn PDF document text
    • http://zufabud.22web.org/73602444004.pdfIn PDF document text
    • http://rixujewo.getenjoyment.net/aristotle_s_definition_of_tragedy.pdfIn PDF document text
    • https://vulajavup.weebly.com/uploads/1/3/4/6/134683256/wejexiwik.pdfIn PDF document text
    • http://tibetterrier.ru/brother_ls14_not_workingwnv0z.pdfIn PDF document text
    • http://normab-id.com/object_oriented_system_development_book_by_ali_bahrami_free_downloadax90r.pdfIn PDF document text
    • http://pobadabodoz.scienceontheweb.net/dictionary_of_accounting_terms.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/fadupazageraf/handwriting_calligraphy_fonts.pdfIn PDF document text
    • https://s3.amazonaws.com/dovulavavo/ashburton_college_second_hand_uniforms.pdfIn PDF document text
    • https://s3.amazonaws.com/muwomapotumugi/monsters_vs_aliens_cast_imdb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f904597a-8d22-4ed8-b162-aee0a8bb3d16/can_you_refuse_a_deposition.pdfIn PDF document text
    • http://dudufimapu.epizy.com/autosomal_recessive_inheritance_worksheet_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d7f6e6b-9ac0-4868-8f78-27a8a54470db/frigidaire_fghc2331pfaa_water_filter_replacement.pdfIn PDF document text
    • http://dataluwemijelo.epizy.com/public_provident_fund_scheme_1968.pdfIn PDF document text
    • http://pasifowon.atwebpages.com/business_communication_letter_writing.pdfIn PDF document text
    • http://nokolul.epizy.com/wakowogifonoxunozepenu.pdfIn PDF document text
    • https://s3.amazonaws.com/mibiwivanetuj/systematic_sampling_method.pdfIn PDF document text
    • http://kagiweluxipo.epizy.com/95467696188.pdfIn PDF document text
    • http://lijowavatajo.myartsonline.com/vabomopulil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3c41499-dcfa-4795-bc52-1e95cae3b586/kenmore_air_conditioner_remote_code.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_off0000f8d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D1 5468 bytes
SHA-256: 423f5177d95770900f870275fe43852514b9a00b51affee0d64a5d7bf08cdcf7
font_01_sfnt_off00010b4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B4F 11004 bytes
SHA-256: 02cc20836eeaa7480592bf0788b7e3dd25cac58d75c6f9cb45370d9b0dbfd2d3

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