Malicious PDF — malware analysis report

Static analysis result for SHA-256 86d2c26da5a477c3…

MALICIOUS

PDF

95.8 KB Created: 2021-05-19 11:54:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: a73b4cb6bf78b6e302b9e2424619ea83 SHA-1: c2be0ac1fd5a341fa4be7c3056a8abbce40f7efc SHA-256: 86d2c26da5a477c304d317597695bec226178252c3369529c8852007612f2a58
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 0.9992

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://kuzutuzo.ru/strik?utm_term=present+perfect+continuous+tense+worksheet+for+grade+5 PDF link annotation
    • https://fudegedetet.weebly.com/uploads/1/3/4/7/134733785/d8d50.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494436/normal_601d965aa0a09.pdfIn PDF document text
    • https://mixutuxo.weebly.com/uploads/1/3/4/6/134692071/5131502.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495684/normal_6017c066e6c72.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368475/normal_5fd12fb4a55cc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370764/normal_602836d01325e.pdfIn PDF document text
    • https://dofemavuxowag.weebly.com/uploads/1/3/0/7/130739836/1957122.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375203/normal_5fd636689f479.pdfIn PDF document text
    • https://fiwofufoneronup.weebly.com/uploads/1/3/1/0/131071066/pakesulupuga.pdfIn PDF document text
    • http://kivesiso.iblogger.org/fundamentals_of_business_economics_free_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469641/normal_5fe26dffe92bc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388046/normal_5fc827619b8fb.pdfIn PDF document text
    • https://niwejeru.weebly.com/uploads/1/3/4/3/134308800/8713053.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369322/normal_6053eb0becc42.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jofeliruf.rf.gd/maxokijodiwagu.pdfIn PDF document text
    • http://zogemidagubaro.epizy.com/belazaxurox.pdfIn PDF document text
    • https://s3.amazonaws.com/tobobowu/latest_ios_for_ipad_mini_2.pdfIn PDF document text
    • http://sevaguv.rf.gd/teruxetujujinobugu.pdfIn PDF document text
    • https://s3.amazonaws.com/viboxikuz/afterlight_2_full_pack_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/wivunonovef/hoover_steamvac_deluxe_upholstery_attachment.pdfIn PDF document text
    • http://girifej.epizy.com/vowutamekobasunowagi.pdfIn PDF document text
    • https://s3.amazonaws.com/rijaliwiguvex/pretty_little_liars_season_4_episode_14_cast.pdfIn PDF document text
    • https://s3.amazonaws.com/gusule/resumen_del_libro_diario_de_greg_1_un_renacuajo.pdfIn PDF document text
    • http://vepulunoxobata.rf.gd/apnea_obstructiva_del_sueo_fisiopatologia.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_off00013794.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13794 5668 bytes
SHA-256: c418291cb94b065fa2c3138e82b9d25da90f70942e3120e17191bd0bfd70eebe
font_01_sfnt_off00014aee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AEE 11256 bytes
SHA-256: 887034cb003eda79f8cf7a31975d08d8ea9ae1ea52c6177490d630ccce58ea92