Malicious PDF — malware analysis report

Static analysis result for SHA-256 de9ba3bd75a7e642…

MALICIOUS

PDF

81.2 KB Created: 2021-04-17 03:08:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: e51b882b9878519bec864ae056239301 SHA-1: 2a5429568556f20c2cc79f9d47f2d134bd2bceb3 SHA-256: de9ba3bd75a7e6421634d3c50ec860aae8b9c0d0691a6f47f63e338c753b1925
126 Risk Score

Malware Insights

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

The file is a PDF containing obfuscated content and multiple embedded URLs, with a high ML score and ClamAV detection indicating maliciousness. One of the primary URLs, 'https://jumiwimov.ru/strik?utm_term=the+monkey%2527s+paw+story+read+aloud', is flagged as an external URI and is likely the intended destination for the user, suggesting a phishing or malware distribution attempt. The PDF structure and embedded links point towards a spearphishing attachment vector.

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://jumiwimov.ru/strik?utm_term=the+monkey%2527s+paw+story+read+aloud PDF link annotation
    • http://apparentlyopt.com/41850322017j2cxl.pdfIn PDF document text
    • http://mavpa.fun/wunazidkl1p.pdfIn PDF document text
    • https://pejetoli.weebly.com/uploads/1/3/1/4/131454808/zolol.pdfIn PDF document text
    • http://shoes-storie.club/farming_simulator_15_games_free_download_for_android2j58o.pdfIn PDF document text
    • https://sagotudiwesuw.weebly.com/uploads/1/3/4/3/134340488/76020aa4a80ef6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369514/normal_601aec41a7774.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379374/normal_5fea1b436ea3c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420764/normal_6066bc6292b89.pdfIn PDF document text
    • https://vowimodinin.weebly.com/uploads/1/3/4/5/134599446/kifot-letibaboga-jafodaluzum.pdfIn PDF document text
    • http://chebsvet.ru/cancion_de_selena_la_carcacha_con_letrawvsln.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471710/normal_60677becaf71f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://0ca3454e-05ac-49fc-8d00-644b1af7be3c.filesusr.com/ugd/8bf3fc_4d7df7d140f745ed9037ab0e5e436b95.pdf?index=trueIn PDF document text
    • https://38c64f87-0506-4925-a3a1-425743e24937.filesusr.com/ugd/386d45_ae6da5ec08854da696fe5a371d5b7608.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gotenukevepunin/59892486508.pdfIn PDF document text
    • https://s3.amazonaws.com/selivuvumepaveb/pain_gate_control_theory.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa885be0-ed1b-405e-ab96-a63564b02643/does_huawei_nova_7i_support_google_play.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1881359-0d9a-4948-a027-7ba3350360a6/how_to_do_manual_roam_on_iphone.pdfIn PDF document text
    • https://s3.amazonaws.com/livivuvuwugeb/how_to_write_a_sponsorship_proposal_letter_for_an_event.pdfIn PDF document text
    • https://s3.amazonaws.com/geraromu/fanazik.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_off0000fd22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD22 5440 bytes
SHA-256: 5c6643aaa833094222fbf6fb8ff736dc3bbabe418043b60faa209690db7a4407
font_01_sfnt_off00010f92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F92 12428 bytes
SHA-256: 97fff456edfaf717ad93ce3522f1bafc1747697e4335b2a1825520b2aff3ff0a

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