Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6474ed3b32697a9…

MALICIOUS

PDF

68.2 KB Created: 2021-03-08 15:39:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 401e78590ed622206635c1e2f72fb03b SHA-1: 92e9ec47d85af07a29b52ff5227c2c87ad4ef3ee SHA-256: b6474ed3b32697a961a86105a7c790d338a26d2af64b6921295bfb4c1972b288
126 Risk Score

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 0.9997

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://bologen.ru/wix?keyword=cafe+lu+website PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4383915/normal_5fcea6f694375.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456143/normal_601f308d11ebe.pdfIn PDF document text
    • http://construt.site/82091010157ymfih.pdfIn PDF document text
    • http://xovebud.mygamesonline.org/zexilaganazexufa.pdfIn PDF document text
    • http://fowatufilomit.iblogger.org/45040058867.pdfIn PDF document text
    • http://rawitotizoxuk.scienceontheweb.net/xetaja.pdfIn PDF document text
    • http://fagumawegoleleb.mypressonline.com/best_monstera_plant.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473056/normal_60179bc6ecc1b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378604/normal_6019f15cd2780.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455645/normal_5fc74b3a19cf6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409609/normal_6023e9cc96712.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4504568/normal_600c837498f73.pdfIn PDF document text
    • http://siviveko.getenjoyment.net/starbucks_barista_hourly_pay_texas.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383449/normal_601be1258fb2d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445550/normal_5fd83de3c8db7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368760/normal_601e37c73a531.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369907/normal_6007313a9f792.pdfIn PDF document text
    • http://bigops.fun/xupavixepedebidiw2fdmi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bobumevemi.epizy.com/dogabalukatej.pdfIn PDF document text
    • http://xekubot.epizy.com/wivaxediloxivikek.pdfIn PDF document text
    • http://bifovigavij.myartsonline.com/gejanabevuva.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_off0000d115.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD115 4800 bytes
SHA-256: 574b4248bf235dfa12af4015e342ad113a764c657e5bfdc637b053c49965c7ef
font_01_sfnt_off0000e191.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE191 10056 bytes
SHA-256: c0a7d904961385681b54968cc3e9304e1e0b9329a64a866ae01acd2c6a5439ed