Malicious PDF — malware analysis report

Static analysis result for SHA-256 16714133288fa001…

MALICIOUS

PDF

92.1 KB Created: 2021-04-05 03:44:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 28b572ff4836e6ebfd360d6ec3d6e152 SHA-1: 5424cbbfbfdb3501c5f31c6f756a4891994de3f5 SHA-256: 16714133288fa0010710b2765275bf402bae7801330963794961dca20f0b7b99
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 0.9991

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/wix?keyword=cuny+summer+corps+jobs PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4393635/normal_6049bd1dcfcda.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471249/normal_602a42cee86e2.pdfIn PDF document text
    • https://cdn.sqhk.co/tavaxiwugo/ixrQwje/invasion_of_privacy_meaning_uk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413375/normal_5fe3e9e09e298.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387712/normal_603a4fb8e6112.pdfIn PDF document text
    • https://cdn.sqhk.co/wixakulu/jhGIjcQ/vubam.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387243/normal_5fd160db2e49e.pdfIn PDF document text
    • http://wotedogupowu.sportsontheweb.net/tirowizirodavavofimogolib.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491159/normal_5ffdd32f2032f.pdfIn PDF document text
    • http://ganitigusawev.mygamesonline.org/84186579939.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476924/normal_603603231cdc5.pdfIn PDF document text
    • https://pimakesoxokozo.weebly.com/uploads/1/3/4/0/134041299/4865620.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/gchdjaG/lolegafofapolad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458635/normal_601180af1f39b.pdfIn PDF document text
    • https://zelewebekosol.weebly.com/uploads/1/3/4/6/134638009/72d4127.pdfIn PDF document text
    • https://cdn.sqhk.co/tilafukefuwe/eicvjfB/33898261084.pdfIn PDF document text
    • https://cdn.sqhk.co/vuluzazogur/Jusighj/automotive_mechanic_salary_florida.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450516/normal_5fca602a1a810.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/votuweroxigezog/sapojaputuk.pdfIn PDF document text
    • http://milebulijulami.onlinewebshop.net/30148423621.pdfIn PDF document text
    • https://s3.amazonaws.com/jujadodedaruxix/arpico_finance_company_plc_annual_report_2017.pdfIn PDF document text
    • http://pevipitoz.atwebpages.com/biroxek.pdfIn PDF document text
    • https://s3.amazonaws.com/xezujuxoz/days_of_the_week_worksheets_for_toddlers.pdfIn PDF document text
    • https://s3.amazonaws.com/robumuduluwise/samsung_smart_tv_remote_manual_2016.pdfIn PDF document text
    • https://s3.amazonaws.com/gurafoga/girl_bestie_status.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_off0001270b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1270B 5060 bytes
SHA-256: d829298b0911badb3252215253ba7b3e2d8223d4eb66d598b0672b3c0bbe9cae
font_01_sfnt_off00013834.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13834 11964 bytes
SHA-256: 2108d1fac300fd783ce6e2905d4c5efffa15ceb60f5eaef483234180aa484f5a