Malicious PDF — malware analysis report

Static analysis result for SHA-256 66034f0868bd054c…

MALICIOUS

PDF

72.3 KB Created: 2021-03-01 13:56:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 2625fb802dc64edbd4996a3ae795c50b SHA-1: ae819b7ce7d6eb2493efb6a45bc6b3bb69b1d668 SHA-256: 66034f0868bd054ca90a5e4805ee16cb98b322913db58ca57216b77108dec5dc
66 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The ML classifier strongly indicated maliciousness. While no scripts were explicitly extracted, the presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' point towards a malicious intent to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://lozipotod.ru/strik?utm_term=how+to+manually+regenerate+culligan+water+softener PDF link annotation
    • http://kiwenalod.medianewsonline.com/how_to_reset_installer_code_on_safewatch_pro_3000.pdfIn PDF document text
    • https://nevipezuke.weebly.com/uploads/1/3/4/6/134652321/65da2b123.pdfIn PDF document text
    • http://laulu-go.ru/16204762237cf4oo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4394079/normal_602f881b8851f.pdfIn PDF document text
    • http://itgermany.net/48878905133ilcqq.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413976/normal_5fcb6477e5ae8.pdfIn PDF document text
    • https://gukulijavezo.weebly.com/uploads/1/3/4/7/134714581/fugufevovisol.pdfIn PDF document text
    • https://cdn.sqhk.co/lowixadoges/TjhMhcY/82859490029.pdfIn PDF document text
    • http://amst-watch-v1.club/dropwizard_maven_core7r14t.pdfIn PDF document text
    • http://waliduv.mypressonline.com/geotechnical_engineering_short_courses_australia.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427080/normal_5ff1f5a5c65c1.pdfIn PDF document text
    • http://setokanekema.mygamesonline.org/56791793491.pdfIn PDF document text
    • https://tevirilozarenov.weebly.com/uploads/1/3/2/6/132695732/dubutej.pdfIn PDF document text
    • https://toroborelap.weebly.com/uploads/1/3/4/8/134867907/tepovalafazuvew_dokilo_lexawewamigizuw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470040/normal_5fe51b5ea6c46.pdfIn PDF document text
    • http://ita-women.space/magento_user_guide8bz9d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000ddd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDD0 5356 bytes
SHA-256: 09c121a55af43131c3b153a2e2f19ab414a6f5549d3a900fa66f242de6b41298
font_01_sfnt_off0000f008.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF008 10336 bytes
SHA-256: 3adaaa2d75288588bbe75a648f2b164b5219597950e041ceca7d665e8b94ee0d

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