Malicious PDF — malware analysis report

Static analysis result for SHA-256 af157a3d07b9311b…

MALICIOUS

PDF

75.5 KB Created: 2021-03-21 07:03:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 90fca8417b498c34b33fdcb8c3ebfb17 SHA-1: 951709b0a51537456cc89bbce4104c66228e7430 SHA-256: af157a3d07b9311bbf4a6672cb2d2e16fb6bc9887d41d262308a235a53fa4d44
126 Risk Score

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://kuzutuzo.ru/wix?keyword=free+digital+footprint+worksheet PDF link annotation
    • https://fevuxutub.weebly.com/uploads/1/3/4/1/134131759/b1468d584b2040a.pdfIn PDF document text
    • https://zowololo.weebly.com/uploads/1/3/5/2/135294949/2e4042aa0034c9.pdfIn PDF document text
    • http://wisalifo.22web.org/tbd_full_form_in_finance.pdfIn PDF document text
    • http://palawawez.mypressonline.com/data_security_and_privacy_in_cloud_computing.pdfIn PDF document text
    • https://lunejuwibamir.weebly.com/uploads/1/3/4/5/134587588/4944882.pdfIn PDF document text
    • https://zokemubolito.weebly.com/uploads/1/3/4/8/134895641/dofajosewapibi-fekekafav-gunokug-liwutawijovimig.pdfIn PDF document text
    • http://noturufupama.iblogger.org/what_are_good_questions_to_ask_your_friends_about_yourself.pdfIn PDF document text
    • http://pamatidela.getenjoyment.net/cpr_guidelines_2020.pdfIn PDF document text
    • https://guxovixig.weebly.com/uploads/1/3/5/3/135317997/bfcb1711e0.pdfIn PDF document text
    • http://pibumutibol.22web.org/vizobexuko.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xufujofaleki/53576684974.pdfIn PDF document text
    • http://satawakerexe.atwebpages.com/2020_ashrae_handbook.pdfIn PDF document text
    • https://8dac4d01-2cd1-45d2-8b5f-6005f802adc9.filesusr.com/ugd/1f96ce_bb884b8b79f849f29acb5053ea09d702.pdf?index=trueIn PDF document text
    • http://sefaweme.rf.gd/deconstructive_architecture.pdfIn PDF document text
    • https://s3.amazonaws.com/bezutu/manual_de_usuario_chrysler_sebring_2001.pdfIn PDF document text
    • http://jejivosijej.rf.gd/66704119354.pdfIn PDF document text
    • https://77bc4ea4-de20-41c0-a463-a5315db628d9.filesusr.com/ugd/2c69e3_c3f68f3c9c54447fbe94c8efa86634e1.pdf?index=trueIn 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_off0000ea5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA5F 5412 bytes
SHA-256: 2bb8f0b9e18fd3f76d67a8cd832c223863c975e4dc705330b7a51532e7f5e58a
font_01_sfnt_off0000fcde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCDE 10680 bytes
SHA-256: f2811cdc00f6cd4882711a17bf7f6cf5609e29ef16b6c962cbc57a96b9672297

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