Malicious PDF — malware analysis report

Static analysis result for SHA-256 e93b39f5bbb99dc1…

MALICIOUS

PDF

76.2 KB Created: 2021-03-19 08:58:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 9b8d0b9eb64fd47b79ef20dbe9482771 SHA-1: 5989a82ea9aac7a54600f3821b04facc4085d00a SHA-256: e93b39f5bbb99dc1444e310575dcc0a08ef9f0efd8c9088e0fc23f2c88cae792
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://crophysi.ru/award?keyword=complexity+of+search+algorithm+pdf PDF link annotation
    • https://wesarifalonaba.weebly.com/uploads/1/3/5/9/135961423/203b542.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370062/normal_6000db15b2e28.pdfIn PDF document text
    • https://cdn.sqhk.co/zapimafe/tjfNXic/american_football_games_schedule.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417214/normal_6018cd10ec9d7.pdfIn PDF document text
    • https://cdn.sqhk.co/tivinarafuvu/riimWhb/60004564131.pdfIn PDF document text
    • http://kojovud.iblogger.org/integral_formulas_inverse_trigonometric_functions.pdfIn PDF document text
    • https://fobuxowomi.weebly.com/uploads/1/3/4/2/134235628/3602318.pdfIn PDF document text
    • http://mevesepegubisis.scienceontheweb.net/norma_astm_a536.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415929/normal_5ff5755d220dc.pdfIn PDF document text
    • https://cdn.sqhk.co/sepagumal/hjgj1hc/63558414237.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375705/normal_604dd7b98854c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://db22a0a0-c6c8-4eb9-9878-037c50d93224.filesusr.com/ugd/e2b5b3_be25b8174c3c4e0ea56d9b804a01c4c6.pdf?index=trueIn PDF document text
    • http://logiweliziweje.onlinewebshop.net/manual_para_caja_registradora_royal_500dx.pdfIn PDF document text
    • http://buzumigasox.myartsonline.com/72553821757.pdfIn PDF document text
    • https://de315c38-daa2-4293-b666-e554ba9b7d65.filesusr.com/ugd/564d2e_4c78b9dc2ca1456ca4beef1dbf026516.pdf?index=trueIn PDF document text
    • http://dowugutupisit.rf.gd/61172827826.pdfIn PDF document text
    • http://zonatitusajobo.onlinewebshop.net/is_bottled_water_free_on_royal_caribbean.pdfIn PDF document text
    • https://356bbf58-84af-4bff-99a9-d03346e46411.filesusr.com/ugd/b5472a_1822ca13f4e34a37adb49b71554efd35.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_off0000ec47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC47 5644 bytes
SHA-256: 13b66451ab4f433e4410fbe3790681305e4dfcdd6148fd697e572202c3abacc6
font_01_sfnt_off0000ff5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF5A 10764 bytes
SHA-256: 9464ea7a23d20b365f3a836779d7a00bf9b9f81aa9e1d593f54cbb931622800f

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