Malicious PDF — malware analysis report

Static analysis result for SHA-256 7728c5f2156aeec7…

MALICIOUS

PDF

72.3 KB Created: 2021-03-12 05:30:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 7ee414cb7bd2497766e799436d4a4161 SHA-1: 968f6956b1fa040c1af127ba545dd2ae04065d6e SHA-256: 7728c5f2156aeec7e46c1cbb7132672f24bcc0358a2828a831fd4a5276b13196
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one heuristic specifically identifying a 'PDF_SEO_LINK_FARM' indicating a large number of outbound links. The primary malicious URL, 'https://maypoin.ru/123?utm_term=guidepost+prayer+request+phone+number', is presented in the document body, suggesting a phishing or malware distribution lure. ClamAV and ML classifiers also flagged this PDF as malicious, supporting the assessment of a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://maypoin.ru/123?utm_term=guidepost+prayer+request+phone+number PDF link annotation
    • http://detonic-romania.website/47193278607fvpm9.pdfIn PDF document text
    • http://stalekost.site/innova_3160b_firmware_update9b19h.pdfIn PDF document text
    • http://wowit.pro/estadistica_descriptiva_cordovasta6a.pdfIn PDF document text
    • http://wdd13.ru/51163856921kq9xv.pdfIn PDF document text
    • http://teachost.com/star_wars_battlefront_2_cheat_enginenpcea.pdfIn PDF document text
    • http://uchebnoe.website/best_real_analysis_online_course59vql.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410201/normal_5fd1f002a4931.pdfIn PDF document text
    • http://flymoney.net/nebalajqswa9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402289/normal_5ff10d7f6a9c9.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/welanisowari/word_2007_tri_fold_brochure_template.pdfIn PDF document text
    • https://s3.amazonaws.com/gurafoga/95882193540.pdfIn PDF document text
    • https://s3.amazonaws.com/jonora/surorege.pdfIn PDF document text
    • https://01d7ec8a-e38e-4e33-8c76-1be31754498b.filesusr.com/ugd/24d943_90de671e572f4ab3b1e4c4f16f390e72.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vazisi/calculating_mean_from_frequency_table_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/rawesaragegugar/xuxurudafopeka.pdfIn PDF document text
    • https://s3.amazonaws.com/zidenigad/minuet_in_g_beethoven_sheet_music.pdfIn PDF document text
    • https://0c6b7a74-1ca0-41da-943c-c268a208a416.filesusr.com/ugd/fef373_77a5ad161c434faeb94516b9329fd2b2.pdf?index=trueIn PDF document text
    • https://6d706a39-1f93-4f1a-9423-caccf7e65e71.filesusr.com/ugd/69f91f_7e826af212fe40878f7a5bd9658d89c7.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE58 5568 bytes
SHA-256: e11f5331537f9290c08308223543e3b1c3ca90b85fb11dd141902ce15469c00a
font_01_sfnt_off0000f11a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF11A 10232 bytes
SHA-256: 06592dec4f72da6a28d169608d35a5b3f0b3a0ab40b5af7d3e8b99ea221eca1a

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