Malicious PDF — malware analysis report

Static analysis result for SHA-256 623a92e4c8c14fe5…

MALICIOUS

PDF

91.3 KB Created: 2021-02-21 06:40:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: aa5ec2505924d98f92affc1d3769073a SHA-1: 92b910ed5155a2a1b89f0063fe63d3dd3a04cede SHA-256: 623a92e4c8c14fe5dc7804c0eb1f99d40ef5290c2b70db16380f27422ff2813f
66 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by 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 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://druttle.ru/123?utm_term=wrecked+camaro+for+sale PDF link annotation
    • http://kraftmann.su/68280570283w52ss.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447437/normal_5fdc8d35f1969.pdfIn PDF document text
    • http://gobigs.space/suvaxegofjffz.pdfIn PDF document text
    • http://organicsss.space/79238901695orntf.pdfIn PDF document text
    • http://wiinorama.space/jambalaya_hank_williams_sheet_music3jgru.pdfIn PDF document text
    • http://jisilasi.22web.org/73374954103.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455890/normal_5fd03309a2313.pdfIn PDF document text
    • http://italia-doc.space/herschede_grandfather_clock_owners_manualxkcpq.pdfIn PDF document text
    • http://bobatukuxoto.iblogger.org/8725434036.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dobejevilorizu.epizy.com/pekitujupew.pdfIn PDF document text
    • http://dajovufozimok.epizy.com/cm_to_inches_conversion_table.pdfIn PDF document text
    • https://s3.amazonaws.com/nitajosasa/atlassian_crowd_supported_platforms.pdfIn PDF document text
    • http://kutepiguzusudax.epizy.com/cordless_answering_machine_phone.pdfIn PDF document text
    • https://s3.amazonaws.com/lupuvogotog/52390600906.pdfIn PDF document text
    • http://zabobenalug.rf.gd/ryobi_one_circular_saw_guide.pdfIn PDF document text
    • http://juwelaloz.epizy.com/49018959792.pdfIn PDF document text
    • http://roruvavaderej.epizy.com/69495134829.pdfIn PDF document text
    • https://s3.amazonaws.com/bomupi/39201642854.pdfIn PDF document text
    • https://s3.amazonaws.com/fapaga/notas_de_acordeon_de_teclas.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_off000123a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123A8 5244 bytes
SHA-256: 7eb91f410ac7e458dc26d1aa642bf8331ae06940adbbf794acd0ac087a3d30e1
font_01_sfnt_off0001357b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1357B 13116 bytes
SHA-256: ddee3d4bd1cf9cf481adb508f013d008575475a1f3edec8720b5611e62b37f59

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