Malicious PDF — malware analysis report

Static analysis result for SHA-256 40013d2b666124d6…

MALICIOUS

PDF

79.1 KB Created: 2021-04-24 15:41:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: af71b3d1d253e38e0d3c0decd737bf14 SHA-1: b8ed7f890240d7ebcd4a7c744b5faf603ff8ceec SHA-256: 40013d2b666124d6537bb143c633ca429f3f27db779b550ee2753995f690c27a
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, with one prominent URL pointing to a suspicious domain ('botokaw.ru') that is likely used for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, suggests a lure related to a 'kitchenaid mixer'.

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://botokaw.ru/strik?utm_term=my+kitchenaid+mixer+won%2527t+turn+off PDF link annotation
    • https://milorupubi.weebly.com/uploads/1/3/4/3/134317418/bb7ac322b4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496597/normal_60566a9c82524.pdfIn PDF document text
    • https://wetegawufuju.weebly.com/uploads/1/3/5/3/135302163/d554f7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486351/normal_602e0df79f035.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385202/normal_6056ce82bbadf.pdfIn PDF document text
    • https://vosaxoro.weebly.com/uploads/1/3/4/4/134469305/bdf0980.pdfIn PDF document text
    • https://gafepodaxo.weebly.com/uploads/1/3/4/6/134606739/wararewola.pdfIn PDF document text
    • http://levupag.22web.org/brownian_movement_2010_movie.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://puzexexaniledow.epizy.com/zisemid.pdfIn PDF document text
    • http://bupalim.atwebpages.com/produccion_de_vapor_en_calderas.pdfIn PDF document text
    • https://s3.amazonaws.com/farokof/double_size_bed_sheets_walmart.pdfIn PDF document text
    • http://zuromor.epizy.com/how_to_prepare_for_freshers_interview.pdfIn PDF document text
    • http://wixufoliwesomep.epizy.com/crystal_reports_asp._net_c_mysql.pdfIn PDF document text
    • http://joxepivebafugig.epizy.com/87563825306.pdfIn PDF document text
    • http://kunubuxeduw.epizy.com/teraxezefazegajakazov.pdfIn PDF document text
    • http://jasesazolaf.myartsonline.com/coliformes_totales_nom_112_ssa1_1994.pdfIn PDF document text
    • http://wuwepapose.epizy.com/crank_length_size_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/nefunupu/64705119704.pdfIn PDF document text
    • http://zanavaf.epizy.com/what_is_error_1001_on_itunes.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_off0000f62b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF62B 5416 bytes
SHA-256: 51b17f262294458a04c5caced9036273b0ac35faae6ed8e95ec0599158a96b15
font_01_sfnt_off0001089f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1089F 11404 bytes
SHA-256: 34404ba29f3a52fa07b8d57f1409bd16c91ea4744592ebda87c37b62b9891139

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