Malicious PDF — malware analysis report

Static analysis result for SHA-256 987d53aea8afd81e…

MALICIOUS

PDF

86.0 KB Created: 2021-06-03 00:05:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 3e8ffa743050947bb7ea861ee7e2b363 SHA-1: c2b50e47e3e86a76b79cb51902fa8a2d5cabbb17 SHA-256: 987d53aea8afd81eccbe7bed74330d2e1d074c6b001e4c0989b0f29ace93c1ab
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 0.9996

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://druttle.ru/123?utm_term=ascii+value+for+form+feed PDF link annotation
    • https://vutajavegev.weebly.com/uploads/1/3/4/0/134040502/lixalapadawizarus.pdfIn PDF document text
    • https://nadazeva.weebly.com/uploads/1/3/4/4/134499610/5c16fe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389823/normal_6006ab46d15c5.pdfIn PDF document text
    • https://makogoporuri.weebly.com/uploads/1/3/4/8/134868573/xosukozono_vukuradunow_lipeletopibuje.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478667/normal_603701d6f2d2c.pdfIn PDF document text
    • https://bazapefonufoteb.weebly.com/uploads/1/3/4/6/134637130/9816926.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481552/normal_5ff58a71ee9e7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463810/normal_5fde00f338af0.pdfIn PDF document text
    • https://fugesozuxi.weebly.com/uploads/1/3/0/7/130739141/xofikimil-jetubigiwolizow.pdfIn PDF document text
    • https://lenusasifelodu.weebly.com/uploads/1/3/4/3/134350773/dukajatuvovur-dolox.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388174/normal_6056f0507273d.pdfIn PDF document text
    • https://puzerufatuv.weebly.com/uploads/1/3/1/1/131163838/gikemixebomudoko.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lugozamuxika.pbworks.com/f/22455783643.pdfIn PDF document text
    • http://zeladejan.pbworks.com/w/file/fetch/144470391/el_regreso_del_caballero_de_la_armadura_oxidada_capitulo_5_resumen.pdfIn PDF document text
    • http://lagawiwefe.pbworks.com/f/what_is_the_message_of_the_chronicles_of_narnia.pdfIn PDF document text
    • http://nukuxim.pbworks.com/w/file/fetch/144528882/90889295423.pdfIn PDF document text
    • http://nagomax.pbworks.com/f/revekom.pdfIn PDF document text
    • http://giwupiraride.pbworks.com/f/pefewovenumixaw.pdfIn PDF document text
    • http://tufukamapaf.pbworks.com/f/1787295231.pdfIn PDF document text
    • http://mapaduzipi.pbworks.com/f/viwudiwaro.pdfIn PDF document text
    • http://liwuvedesisu.pbworks.com/w/file/fetch/144526410/21166025651.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_off00010e6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E6E 5216 bytes
SHA-256: 85dc051456eaac26db2eff470df3899594bcd9bed4e12650d355371780210670
font_01_sfnt_off00012022.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12022 12472 bytes
SHA-256: 4c053e1f8b22ab506eb4f916dfc5d36fc7a76a7c28f4df52871a1a1521d4c68b