Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d64f239c223aa15…

MALICIOUS

PDF

89.3 KB Created: 2021-03-13 14:24:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 98f943e7d57950c93e88bd31a318b259 SHA-1: d724237079fc9b5e163a4ae5222e1e7b16d2c3a6 SHA-256: 1d64f239c223aa159e7bbd951ae42005b82aaf36e56e52d94b92549bc5464d22
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with several pointing to disposable hosting and identified as part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 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://druttle.ru/award?keyword=iso+7816+4+apdu+commands+pdf PDF link annotation
    • https://cdn.sqhk.co/maxevurux/bDigheY/cooking_joy_2_update.pdfIn PDF document text
    • https://gumevuwogixuxuj.weebly.com/uploads/1/3/5/3/135317748/bimakotosu.pdfIn PDF document text
    • http://sukozuxari.22web.org/cartesian_plane_worksheet_grade_9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408478/normal_602adf81b0f9f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409107/normal_6004ce66605c8.pdfIn PDF document text
    • http://wapividazofar.scienceontheweb.net/toro_ecxtra_manual_start.pdfIn PDF document text
    • http://gadivawiw.sportsontheweb.net/tosijokojitex.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451368/normal_60314715c41ee.pdfIn PDF document text
    • https://cdn.sqhk.co/remezebona/thaRPVh/candy_crush_soda_saga_mod_apk_unlimited_everything.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370304/normal_5ff004769eb4a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414339/normal_60333f5e6b1aa.pdfIn PDF document text
    • https://kosodakugup.weebly.com/uploads/1/3/4/6/134655388/a8622fa8.pdfIn PDF document text
    • https://gorofegi.weebly.com/uploads/1/3/4/4/134462705/d5f33c7018.pdfIn PDF document text
    • https://jofomozali.weebly.com/uploads/1/3/5/3/135387403/3426805.pdfIn PDF document text
    • http://jirapunobos.22web.org/71271296238.pdfIn PDF document text
    • https://cdn.sqhk.co/kajutizikodu/bQgfjdj/scrap_clicker_2_import_code.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://damikofem.rf.gd/44154251757.pdfIn PDF document text
    • https://s3.amazonaws.com/wukevirenesu/how_to_make_easy_paper_pencil_box.pdfIn PDF document text
    • https://s3.amazonaws.com/jofunozuzof/south_african_drinking_water_guidelines.pdfIn PDF document text
    • http://bamalupit.rf.gd/beamng_ng_drive_demo.pdfIn PDF document text
    • https://s3.amazonaws.com/vukusa/am_i_average_looking_quiz.pdfIn PDF document text
    • https://s3.amazonaws.com/xokebore/terobowebumomevor.pdfIn PDF document text
    • https://s3.amazonaws.com/zebarufuridorur/23160551737.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e65a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE65A 19552 bytes
SHA-256: 567abc9c37d2f135499dfe41e743e56bd50ebdddf5b92604a1385969851614b0
font_01_sfnt_off00011f77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F77 5680 bytes
SHA-256: ab868428468d5714f51145a49af6276d1d79af1839b089f8b63778e08dcdf3b5
font_02_sfnt_off000132d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132D1 10580 bytes
SHA-256: e56580dff2472b24658a0f0f4cffba0ebb906e346d1da020ec4f579fd2201e88

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