Malicious PDF — malware analysis report

Static analysis result for SHA-256 1446f8a54eccd2fa…

MALICIOUS

PDF

65.9 KB Created: 2021-03-12 11:09:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 0640706ae2996d8be587adb4c0b8cefb SHA-1: d0b6582ee02c5af9dcecc16c8a1d0a290c01d1f4 SHA-256: 1446f8a54eccd2fa381d46a80a1e8964bc5d51713103cb2e31f7f4ae936a4a7c
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-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://fokemale.ru/123?utm_term=learnership+interview+questions+and+answers PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4374380/normal_60083b0d3706f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484994/normal_600b9ae515110.pdfIn PDF document text
    • http://lebuvowune.getenjoyment.net/brche_addieren_und_subtrahieren.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390366/normal_5fdd18518bb5d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427076/normal_6003a3cad09c1.pdfIn PDF document text
    • http://dawepajez.22web.org/demixu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369183/normal_6038c387d1f55.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388177/normal_602dd0f1cb50a.pdfIn PDF document text
    • http://megazoni.iblogger.org/s_p_letter_status_video.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415524/normal_600cfdf625a95.pdfIn PDF document text
    • http://safijejog.mygamesonline.org/68884944072.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fodimezafizuver.epizy.com/zugatakibupobi.pdfIn PDF document text
    • https://a32e93c2-1aa3-4149-af29-aa5d163ab988.filesusr.com/ugd/40336e_514d82aaf3c34f2cbf18966eeb639589.pdf?index=trueIn PDF document text
    • https://569e8712-2873-4b93-a654-ea71b6b809e3.filesusr.com/ugd/345929_977ed24829b646ecba031d9faf5111c2.pdf?index=trueIn PDF document text
    • http://todidetiped.onlinewebshop.net/mumeboxusufejedativurogez.pdfIn PDF document text
    • http://xafamikipu.epizy.com/android_9_samsung_note_8_beta.pdfIn PDF document text
    • http://darajakejaxise.rf.gd/square_and_cube_negative_numbers_worksheet.pdfIn PDF document text
    • http://jibimom.myartsonline.com/mathematics_teacher_s_guide_grade_8.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_off0000c690.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC690 5232 bytes
SHA-256: 5197774954abd97215a6700c1043c19e7d1d25d3148991b6c755acc6aff61dbf
font_01_sfnt_off0000d86c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD86C 10016 bytes
SHA-256: cbbeb4cea75baa72c8f3d7b403aebc07d166d10451a6fd788785c12981382fa2

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