Malicious PDF — malware analysis report

Static analysis result for SHA-256 33daed6a0e997c99…

MALICIOUS

PDF

90.0 KB Created: 2021-03-09 13:22:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: b88c0fb64b7cd83c72cfb8bbc1bdec85 SHA-1: 301d0271c6b3e023cccc5de6d9adbf3ee08ed179 SHA-256: 33daed6a0e997c99c2b433ed4866199ec9e61b77591cff796cba75691505d901
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a high heuristic score indicating it's a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attack pattern involving redirection to malicious sites.

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://jumiwimov.ru/award?keyword=abirami+anthathi+pdf+in+english PDF link annotation
    • http://tuderoba.getenjoyment.net/tuledegegixeg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458633/normal_6010ea12972f8.pdfIn PDF document text
    • http://bobixina.getenjoyment.net/how_do_i_stop_my_sharp_microwave_from_beeping.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485580/normal_5ff1491815542.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443594/normal_5fcae83908b62.pdfIn PDF document text
    • http://bukawavado.medianewsonline.com/how_to_service_a_john_deere_d110.pdfIn PDF document text
    • http://gijaninapumobe.sportsontheweb.net/wojumabibepawudoga.pdfIn PDF document text
    • http://dawexefif.getenjoyment.net/34372815895.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478137/normal_603192ca61704.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://15e12281-0fef-4bb1-b284-2b61ddec1698.filesusr.com/ugd/6c5390_e295f7a652234d2481c109924ed7fafa.pdf?index=trueIn PDF document text
    • http://vigexosav.myartsonline.com/fipaseravobemabaruna.pdfIn PDF document text
    • https://s3.amazonaws.com/mokuwanibof/bahamas_crs_reporting_portal.pdfIn PDF document text
    • http://nukilaba.myartsonline.com/49723923777.pdfIn PDF document text
    • https://0e8f88b9-656e-4b05-9cd8-8bd477f85547.filesusr.com/ugd/95b9ea_84f4faaea6f244aa91951253ff157798.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gulapore/47508573552.pdfIn PDF document text
    • http://fuvarijes.atwebpages.com/cards_against_humanity_online_gameplay.pdfIn PDF document text
    • https://s3.amazonaws.com/veledabejufi/little_caesars_cheese_pizza_nutritional_information.pdfIn PDF document text
    • https://s3.amazonaws.com/fedure/dibagubimabegerivagat.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_off000125fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125FD 5584 bytes
SHA-256: 8e2c458953b51b9b7484a906e1be28f50ff1d53cd030ed09435a3c7792d9212a
font_01_sfnt_off000138cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138CB 10104 bytes
SHA-256: 853c7b96a2db6df21d29eacf6402f89ca5859ac59db3dd86f58444c605e412b2

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