Malicious PDF — malware analysis report

Static analysis result for SHA-256 c118fdb8777855a0…

MALICIOUS

PDF

80.9 KB Created: 2021-02-26 19:09:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 6e84b9a359bda588b8b5917514285096 SHA-1: 1437b5575eaa768193bc6d3219040f688d5e216c SHA-256: c118fdb8777855a01bd5bcb7345a670f94c45d6245c07978f960e8013684459e
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable hosting and are structured to appear as downloadable files, such as 'settings.apk'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of external URIs and the link farm heuristic suggest an attempt to redirect users to malicious content or downloads.

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://crophysi.ru/wix?keyword=settings.apk+fire+tv+2019 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4425760/normal_6022eece25602.pdfIn PDF document text
    • http://weinmvc.net/kugasu54mxr.pdfIn PDF document text
    • http://nakrutkavk.site/alfonsina_y_el_mar_partiturat9lvu.pdfIn PDF document text
    • http://jaralet.getenjoyment.net/3578579700.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393197/normal_600dc2abb8544.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381289/normal_60290a366d256.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378618/normal_5fe5bc0cb170d.pdfIn PDF document text
    • http://kurs1.xyz/diagrama_de_flujo_conectormruuf.pdfIn PDF document text
    • http://nikaold.site/toyota_camry_xse_for_sale_in_ga4hkn6.pdfIn PDF document text
    • http://erkutungotu.com/chelsea_stadium_seating_guidei6265.pdfIn PDF document text
    • http://italy50wow.pro/70928707790wy76l.pdfIn PDF document text
    • http://gutprod.xyz/97899487431d7ftg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416802/normal_6011dbb929b9d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393751/normal_5fccd16bf3fbd.pdfIn PDF document text
    • http://lidzadva.xyz/solid_geometry_questions_and_answersl8kxz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://lubozogemodusa.epizy.com/pujaziridu.pdfIn PDF document text
    • http://taxowojo.epizy.com/xovopapidaxid.pdfIn PDF document text
    • http://ziwivazud.onlinewebshop.net/49128598479.pdfIn PDF document text
    • http://sajulugebimisu.myartsonline.com/sikutepuwijosidazexu.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_off0000f1ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1EE 5456 bytes
SHA-256: 5d092b4b0af3aa6fac506b73c6216ac1c7119e7861c6b0bad8e8444362b770ad
font_01_sfnt_off0001048e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1048E 10308 bytes
SHA-256: ad183919cf1efa8bbf64069e8f2a8c95cd1cc39a27c5c2e7a81568c28b3ecfb7
font_02_sfnt_off000127d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127D9 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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