Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee9f9e0db5da7eae…

MALICIOUS

PDF

81.4 KB Created: 2021-04-03 00:54:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 362bc075c90b89d8953e4dd3c8457ddd SHA-1: 9e020c936c08a49b2d625dd8536f2abb587e7474 SHA-256: ee9f9e0db5da7eae12e958b61a3aac28006701b6359d808a1ff7544d0dfb480a
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The document body, though heavily obfuscated, contains keywords related to 'Crioterapia' and 'pdf', likely a pretext to disguise the malicious intent of directing users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://nipisod.ru/award?keyword=crioterapia+definicion+pdf PDF link annotation
    • http://changepass.online/ukulele_strumming_patterns_4_4d4fg6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420025/normal_5ff2bb86bfe06.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459180/normal_5ff855d230a2e.pdfIn PDF document text
    • http://mazers.fun/sidejolulanerivorolale5ezwe.pdfIn PDF document text
    • http://obuv-kozha.ru/9th_class_physics_textbook_andhra_pradeshc418a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419633/normal_601b67efcff5a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497344/normal_6021a93ce85b5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481411/normal_5fe8fa3b374d4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454429/normal_60037bdd8f622.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nipugizanevowo.rf.gd/rekedupizifavifumagule.pdfIn PDF document text
    • https://s3.amazonaws.com/kukazowox/40131833370.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc672534-dae0-49da-beec-751ef1c72337/nugigaforarasox.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55f3a652-dcd8-4ef5-96b6-5d520a530203/8380361725.pdfIn PDF document text
    • http://nufolupi.epizy.com/siboririvow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d33b718-f4f8-4886-9292-9091d045bdf1/bissell_powerforce_helix_replacement_belt_size.pdfIn PDF document text
    • https://s3.amazonaws.com/gekojulog/90117085925.pdfIn PDF document text
    • https://s3.amazonaws.com/tugafebip/najudufubitidozinonije.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4045c03a-0c41-4a03-a16f-b287e875af85/luxawofob.pdfIn PDF document text
    • https://s3.amazonaws.com/fajujiju/duxilikasuzigojowiv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a715f69-2bd3-45e6-8688-03acacd4c425/mcmap_grey_belt_moves.pdfIn PDF document text
    • http://vemexomejolu.epizy.com/max_speed_wireless_ac.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_off0000f997.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF997 4844 bytes
SHA-256: 719856d83a3081e7fd847f9dc4f2d15d900169dd1cbbde367cbba3797dc85602
font_01_sfnt_off00010a22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A22 13744 bytes
SHA-256: 7724c77095a11e6e39b1c1d796aa7c71d593d0d088560ac51047bc8093c46649

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