Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2aff9caa30f5aff…

MALICIOUS

PDF

75.3 KB Created: 2021-02-26 19:31:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 866bd472d061679aeeca343ac62ad2d1 SHA-1: 9eb8e4a073d10cfae643e66a4b40c9d6fce01814 SHA-256: b2aff9caa30f5aff5b10045b5e03a13cdfdd69072c1efc7296a9d87dc6a98453
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://midufefew.ru/wix?keyword=direct+drive+vs+gear+reduction+starter PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4408873/normal_60053b64e9f88.pdfIn PDF document text
    • http://bewaniv.22web.org/tipos_de_comunicacion_en_relaciones_humanas.pdfIn PDF document text
    • http://ukranews.icu/midea_washing_machine_service_manual62t9j.pdfIn PDF document text
    • https://cdn.sqhk.co/gogojelawov/Aejaqgg/truck_upholstery_repair.pdfIn PDF document text
    • http://babarogumo.iblogger.org/simple_baseball_score_sheet.pdfIn PDF document text
    • https://cdn.sqhk.co/sileluzorupo/dhbhdic/36007333400.pdfIn PDF document text
    • http://jarobadut.22web.org/jenobiwusokatelanos.pdfIn PDF document text
    • https://cdn.sqhk.co/suxujaba/8ih9cie/46117067708.pdfIn PDF document text
    • https://cdn.sqhk.co/jiwosowo/gi7ihye/36933185841.pdfIn PDF document text
    • https://cdn.sqhk.co/tezofugowura/jgirgdK/niwatufaxabopove.pdfIn PDF document text
    • http://wisitens.online/college_hoops_coach_apk0dp9e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bijiwamosijiw.epizy.com/31528093470.pdfIn PDF document text
    • http://januxak.rf.gd/vshare_for_ios_7.pdfIn PDF document text
    • http://xijodakofifo.epizy.com/14596270025.pdfIn PDF document text
    • http://lodonevubepivor.epizy.com/mathematica_11_for_ubuntu.pdfIn PDF document text
    • http://puzasapexuwuju.epizy.com/bobivis.pdfIn PDF document text
    • http://fologipuvug.epizy.com/tugidopov.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_off0000ea04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA04 5132 bytes
SHA-256: 2ecdd92830287c3a5a64300744a40989054c56a395dc8cc8c9e27f212d02bd81
font_01_sfnt_off0000fb96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB96 10736 bytes
SHA-256: cfd4c9ffe79ed8379e01ac3ddc9526df7a7bd9a1f6dd012329e5e4e207a1a8e4

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