Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0f8ab7da27f78e5…

MALICIOUS

PDF

83.9 KB Created: 2021-04-07 13:49:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: b5d8945fef6667905d7c2690a916a727 SHA-1: 53ae000cd7dd4a576e43b23205fc9938c6f3bb73 SHA-256: a0f8ab7da27f78e504ca181d88be8d05c0152154e693e20c432672cf19d3c071
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 0.9997

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://vilenefex.ru/123?utm_term=bursary+application+form+for+2019 PDF link annotation
    • https://cdn.sqhk.co/kuwusemob/hgjfEja/pdf_annotator_free_portable.pdfIn PDF document text
    • http://white-x.fun/ice_cream_sandwich_nutrition_sugar73o0u.pdfIn PDF document text
    • https://lulodepi.weebly.com/uploads/1/3/0/7/130776712/9037971.pdfIn PDF document text
    • https://cdn.sqhk.co/xawodoze/hjjfjs8/40k_adeptus_mechanicus_codex.pdfIn PDF document text
    • https://manadazalivufud.weebly.com/uploads/1/3/4/3/134358645/lisoge_fesatufakukux_rozokazo_xevupo.pdfIn PDF document text
    • https://vimititop.weebly.com/uploads/1/3/4/3/134339659/rizeb_mivirid_peman.pdfIn PDF document text
    • http://carinsusa.info/spectrum_math_workbook_grade_8_free92cvz.pdfIn PDF document text
    • https://tidosivapozagul.weebly.com/uploads/1/3/4/3/134390518/bijizuvesabatagoxosi.pdfIn PDF document text
    • https://cdn.sqhk.co/zovitamojim/NhaEbjb/xowoninoxubifuw.pdfIn PDF document text
    • https://vowebaxuzifov.weebly.com/uploads/1/3/0/7/130738870/vesimet-lobedadano-daluzeba-jukalulu.pdfIn PDF document text
    • http://about-central.com/cabrio_washer_service_manualnu4mh.pdfIn PDF document text
    • http://kukushka.space/54998422376odt1p.pdfIn PDF document text
    • http://megatorg.ru/xirabilujutunazevzrrz.pdfIn PDF document text
    • https://cdn.sqhk.co/logubaxe/iePMigk/39759469413.pdfIn PDF document text
    • http://tehnikator.ru/jivurimabigim1ch3.pdfIn PDF document text
    • http://dronextactical.xyz/91236159615wljh8.pdfIn PDF document text
    • https://pamiwawoxok.weebly.com/uploads/1/3/6/0/136089952/9862203.pdfIn PDF document text
    • https://wezinifagewugi.weebly.com/uploads/1/3/2/8/132815004/9684451.pdfIn PDF document text
    • http://national-verifyteam.com/110630673167400m.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/sojaxub/laxonuroxifepukekaviv.pdfIn PDF document text
    • https://s3.amazonaws.com/babuxufarizuxur/25923774106.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_off0001062f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1062F 5792 bytes
SHA-256: 2550476e798ca804b00606ce61ebc12aa46cf311d0152863434a48acf9c25b4f
font_01_sfnt_off000119de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119DE 11488 bytes
SHA-256: 65521876d5737e07b7bf4251a204fc5e391b91658f29e4d50dbb7059a0a7872d

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