Malicious PDF — malware analysis report

Static analysis result for SHA-256 73587c245620d968…

MALICIOUS

PDF

90.5 KB Created: 2021-04-01 07:04:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 76235d3a1ff25258119609e13dc79547 SHA-1: d1d6d7324efd222ff95d367fa0968ac49b46394c SHA-256: 73587c245620d9689328422e9b48bf20a81164c0d33f108f9601830e2943a9ea
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 pointing to Weebly and S3 domains, suggesting a link farm designed to host malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://seumenha.ru/123?utm_term=apogee+duet+2+maestro+manual PDF link annotation
    • https://risimapi.weebly.com/uploads/1/3/4/3/134321435/nujukav_somevugikez_pexigazo.pdfIn PDF document text
    • https://tivofexogi.weebly.com/uploads/1/3/1/3/131398075/3349532.pdfIn PDF document text
    • http://toguvuveleguna.22web.org/19884314196.pdfIn PDF document text
    • https://mufobaxepomek.weebly.com/uploads/1/3/4/8/134866816/1420534a.pdfIn PDF document text
    • http://nagesebaz.iblogger.org/part_time_employment_contract_template_canada.pdfIn PDF document text
    • http://potoborotagivud.22web.org/sigezulonazaso.pdfIn PDF document text
    • http://votixowet.22web.org/aggregate_soundness_test.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/vonuxagupeduze/22467482380.pdfIn PDF document text
    • http://vulofuza.epizy.com/disfrutar_michelin_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/zetubakuz/dijafit.pdfIn PDF document text
    • https://s3.amazonaws.com/nojemi/how_to_draw_a_dog_face_realistic_step_by_step.pdfIn PDF document text
    • https://s3.amazonaws.com/baposivarabuj/t._j._hockenson_scouting_report.pdfIn PDF document text
    • https://s3.amazonaws.com/dinisemowoge/gcse_english_language_paper_1_2017_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/suxugipipolazog/gcse_maths_compound_interest_questions_and_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/norozovijalu/welaxi.pdfIn PDF document text
    • https://s3.amazonaws.com/pipaneku/bluestacks_1_for_pc_windows_xp.pdfIn PDF document text
    • https://s3.amazonaws.com/voxulija/warframe_distilling_extractor_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/kibavutibeved/dilation_and_similarity_worksheet_1_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/fedure/86092687546.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010c9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C9D 5400 bytes
SHA-256: f70fa4a54bd394a0185eb503dcb7334c79e4e2999ab7b7dc4497043ff0b2ef72
font_01_sfnt_off00011ee6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EE6 11956 bytes
SHA-256: 5cbaa36b3061eb0c3c48c104b30c8b05c790e02ccbd278a64edf62a7919b9a12
font_02_sfnt_off000147c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147C7 16060 bytes
SHA-256: d1a84ba8f0e4a827a048d387db8dd5dae3538f1c7e72415b16af587a9947cdc7

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