Malicious PDF — malware analysis report

Static analysis result for SHA-256 a05b1682c63cb00d…

MALICIOUS

PDF

79.7 KB Created: 2021-04-05 18:35:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: af4539817f64f1526a92f7fa3271a5be SHA-1: 20e8a13ef01976912390039130e666e9d62f15e1 SHA-256: a05b1682c63cb00dc1d27500758d65be305802e573c2101d700c0180ad3689b9
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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://pelibifir.ru/123?utm_term=noaa+climate+change+report+november+2018 PDF link annotation
    • http://niwifara.22web.org/xedewu.pdfIn PDF document text
    • http://rogijowop.sportsontheweb.net/tapalovapevupomukuvil.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496853/normal_60122038a136b.pdfIn PDF document text
    • http://sazefakopek.iblogger.org/maxazujet.pdfIn PDF document text
    • http://wiboratiraveguw.mygamesonline.org/arihant_banking_awareness_2020.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4531626/normal_5ffb751e34bd2.pdfIn PDF document text
    • http://reduslimitaly-official.site/528586401396rjvr.pdfIn PDF document text
    • http://jalazekesofijot.medianewsonline.com/37324701240.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484103/normal_5fca934b88385.pdfIn PDF document text
    • http://tiktokhd.design/what_is_the_cheapest_thing_at_starbuckspuc8o.pdfIn PDF document text
    • http://winsl.space/addition_solving_problems_worksheetsmxlzg.pdfIn PDF document text
    • http://xviiivbgz.com/synaptic_package_manager_for_kali_linux37sfy.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/muwomapotumugi/grunthal_livestock_market_report.pdfIn PDF document text
    • https://s3.amazonaws.com/dixaleko/fokobofazukixixigodus.pdfIn PDF document text
    • https://0cc2a7d0-6f33-4335-9ec9-554d9418487e.filesusr.com/ugd/cb4a18_f7540a92e55f4d0096f057f1f90429f4.pdf?index=trueIn PDF document text
    • https://4e33067b-0f13-4bed-bb9c-ea95f768fd7c.filesusr.com/ugd/23924c_59306d91bd894adf88259dd852e3f381.pdf?index=trueIn PDF document text
    • https://ac911ccd-a574-46a9-bbb3-57bb927ff796.filesusr.com/ugd/2735c9_abcb3ab9922d462aaf688ae4422d0803.pdf?index=trueIn PDF document text
    • https://769966b8-4adc-437e-bba8-f198cf6e171b.filesusr.com/ugd/41a0b6_a596390d5f88449f965376a5afd67839.pdf?index=trueIn PDF document text
    • http://vexukaxazixaxet.epizy.com/bienestar_laboral.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_off0000f7da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7DA 5860 bytes
SHA-256: 47212beb9bec346cb3532a38f88e551380e6811d0e681086cb327e4e1366400f
font_01_sfnt_off00010bb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BB0 11124 bytes
SHA-256: 4997d3560c8be0f4a202860cb3535db619c18dc4ab54f009fda418d8800e582b

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