Malicious PDF — malware analysis report

Static analysis result for SHA-256 70b2c9ac47676796…

MALICIOUS

PDF

77.7 KB Created: 2021-05-17 01:56:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 9e8b5dd298da709e414fa56a55a07644 SHA-1: eec8e9c3091e91297255faba74890d48d714ee62 SHA-256: 70b2c9ac47676796f169865c7ece2c1dcbc311488a6061328531c9e2c4a436f0
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicative of a link farm or phishing campaign. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded URIs point towards malicious redirection, likely to phishing or malware distribution sites.

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://zajinet.ru/strik?utm_term=how+hard+is+the+algebra+1+eoc PDF link annotation
    • https://cdn.sqhk.co/devurekon/cijHPvZ/wonofapig.pdfIn PDF document text
    • https://cdn.sqhk.co/rolaravez/jjBjeNh/burafukumutizurepuf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478123/normal_602ad821a3590.pdfIn PDF document text
    • https://cdn.sqhk.co/zatejurix/Zxhcqy3/julatukikufifumejov.pdfIn PDF document text
    • https://zajevikafe.weebly.com/uploads/1/3/5/2/135297545/6667566.pdfIn PDF document text
    • http://wegixaro.iblogger.org/77289862340.pdfIn PDF document text
    • https://pifavakibapel.weebly.com/uploads/1/3/0/8/130814246/kabofulerujive.pdfIn PDF document text
    • http://bokifov.iblogger.org/the_babylon_mystery_religion.pdfIn PDF document text
    • http://nitesufi.sportsontheweb.net/workforce_planning_process.pdfIn PDF document text
    • http://belepebo.mywebcommunity.org/page_break_in_using_php.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463300/normal_5fc96d34c97bf.pdfIn PDF document text
    • https://cdn.sqhk.co/tenalewi/gjhgigN/telugu_christmas_songs_mp4_free.pdfIn PDF document text
    • http://jotafitosixa.getenjoyment.net/17849610761.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376099/normal_6041c4c9b7539.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413236/normal_602af388bea5e.pdfIn PDF document text
    • http://bifakibebus.iblogger.org/introduction_to_public_finance_and_taxation.pdfIn PDF document text
    • https://cdn.sqhk.co/zorimedi/OUfThbo/xijetidesazenuxodes.pdfIn PDF document text
    • https://wurilulisewanid.weebly.com/uploads/1/3/4/7/134728532/4254356.pdfIn PDF document text
    • http://wijetaz.mypressonline.com/77956357205.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://bajanibutibo.rf.gd/redinut.pdfIn PDF document text
    • http://venewimo.rf.gd/nafudimavifedetes.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e341.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE341 5128 bytes
SHA-256: 692760f08fc513a198a730339d92bb8c805144790ce723a4df42f7505ce1dc1b
font_01_sfnt_off0000f4e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E1 11324 bytes
SHA-256: b4e4ee2f53b616e47f8a81f73e3765b3f81b7da05db4ec1f0ab120f389723deb
font_02_sfnt_off00011b78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B78 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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