Malicious PDF — malware analysis report

Static analysis result for SHA-256 99232e7c0fe3b5d9…

MALICIOUS

PDF

80.5 KB Created: 2021-03-27 19:58:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: a1a4c177270b78b2c8cccc253f6aab71 SHA-1: 4a9121e39d6bb55a7ddc46a19f7b91ca7c522f0a SHA-256: 99232e7c0fe3b5d918efde4a9c7af01b9d90ac399d40959b179ed66b72386481
186 Risk Score

Malware Insights

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

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 0.9991

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://druttle.ru/strik?utm_term=honda+civic+hidden+menu PDF link annotation
    • https://pafasuletelaw.weebly.com/uploads/1/3/4/4/134447528/7279264.pdfIn PDF document text
    • http://kind-insta.site/kukugadimuvozegvri.pdfIn PDF document text
    • http://erogan-encolumbia.site/maggie_a_girl_of_the_streets_important_quoteshktda.pdfIn PDF document text
    • http://megantv.site/photoshop_cs6_tutorials_for_beginners_free_downloadlr91x.pdfIn PDF document text
    • http://kdghy.online/luzasisusajujebiwaxgmt2o.pdfIn PDF document text
    • https://loleritukala.weebly.com/uploads/1/3/0/9/130969936/fixepijokire.pdfIn PDF document text
    • http://carinsusa.info/spectrum_math_workbook_grade_8_free92cvz.pdfIn PDF document text
    • https://bonavipopugob.weebly.com/uploads/1/3/2/3/132302892/7937852.pdfIn PDF document text
    • https://goxejebifebiv.weebly.com/uploads/1/3/2/6/132682819/1871e045.pdfIn PDF document text
    • https://vemegerefawobe.weebly.com/uploads/1/3/2/6/132682093/8433894.pdfIn PDF document text
    • https://cdn.sqhk.co/ravuviwidi/Mgcjihj/69660344759.pdfIn PDF document text
    • https://xaweworamek.weebly.com/uploads/1/3/4/6/134610398/zapuvupamiluruw_munozelisowu.pdfIn PDF document text
    • https://cdn.sqhk.co/rirakibugo/hBWMBhA/rilunuwerov.pdfIn PDF document text
    • https://galidenik.weebly.com/uploads/1/3/1/8/131856819/divigefafubap-wepusadevalu-kovuraxo-dopirubutoxigel.pdfIn PDF document text
    • https://tunoritusaw.weebly.com/uploads/1/3/5/3/135328070/3979374.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/pigolo/john_deere_x304_service_manual_free.pdfIn PDF document text
    • https://s3.amazonaws.com/jezobasit/85168256152.pdfIn PDF document text
    • https://5c839259-519f-4cee-a1a2-6639d654070b.filesusr.com/ugd/140efa_03db9fef9ffe4aebaa64858ae57e019d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wazotojemov/4117133649.pdfIn PDF document text
    • https://08b4a39d-fa16-4eaa-91be-ae90003cacb9.filesusr.com/ugd/237bf7_b0c47bd04bdb41f08edcc16703a0e592.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pusori/template_wordpress_l_g.pdfIn PDF document text
    • https://s3.amazonaws.com/kesumasaka/taylormade_r15_driver_review.pdfIn PDF document text
    • https://b9eb3541-094c-4606-b101-17c2291fd6e1.filesusr.com/ugd/a18601_4d33d1c8874942fda98f4d6ef4087426.pdf?index=trueIn PDF document text
    • https://bd7a0a6f-bbfd-49cc-ba41-c3f2778102d9.filesusr.com/ugd/9ea91e_5645ababf5254b1dbb4473b354f97078.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_off0000fe3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE3B 4896 bytes
SHA-256: efc9e76505402880e615967b02e789fa4a6e4e80bac4823af5ec579ca7c50949
font_01_sfnt_off00010ec1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EC1 10560 bytes
SHA-256: 0ec52b7497836a0aa2baac4bb28656e2009ba5518fcfa9ecf0c12ea9310c5bed