Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce41aac59d7a1baf…

MALICIOUS

PDF

79.7 KB Created: 2021-03-28 14:14:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: ec377044d5e1776c35832b9b53e1894d SHA-1: 7330c15d2aafe13c45f854bf310c28e7ab6a632f SHA-256: ce41aac59d7a1baf0c7115e2871f3a5a5011c334c7464b1025669d75e963ceee
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://kuzutuzo.ru/award?keyword=classification+of+basidiomycota+pdf PDF link annotation
    • http://logekolumo.22web.org/online_bengali_books_free_download.pdfIn PDF document text
    • http://tijixakuv.iblogger.org/63622367624.pdfIn PDF document text
    • https://cdn.sqhk.co/mifijizudi/cicjhji/2276550538.pdfIn PDF document text
    • https://cdn.sqhk.co/dadirowuj/jage8gd/fozinalajo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482636/normal_6014dcd45ac31.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496151/normal_60175fc5157a0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464313/normal_604364afb2075.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379387/normal_5ff77fb34aece.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/45a710d9-7e39-4db5-840c-3f3f96227fa7/jajobiduroxojologug.pdfIn PDF document text
    • http://xavimew.rf.gd/cell_membranes_and_transport_worksheet_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/poresi/vonefezarowibafuwamuzesug.pdfIn PDF document text
    • http://zasupafevi.rf.gd/promised_land_book.pdfIn PDF document text
    • https://s3.amazonaws.com/piwanisaj/buneximav.pdfIn PDF document text
    • http://birofasadonu.epizy.com/15520647629.pdfIn PDF document text
    • https://s3.amazonaws.com/mufukep/cotton_patch_blackened_tilapia_nutritional_information.pdfIn PDF document text
    • http://fabibupotiliba.epizy.com/nufebagedijifevaku.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_off0000fd3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD3D 5352 bytes
SHA-256: f2449e714a10f1513bb711d6ce32f215a2182490dd6eb4f13038beae75849420
font_01_sfnt_off00010f65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F65 10128 bytes
SHA-256: 2585a733154358fa9bd9a1e6395be6bc7547faa5ed7eb34930dc58a1ed64465c

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