Malicious PDF — malware analysis report

Static analysis result for SHA-256 231211116cd5cfbf…

MALICIOUS

PDF

77.3 KB Created: 2021-03-14 22:54:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 149e4d880da344fd232c72310f1b2171 SHA-1: 0e044d37e82ada209a8c6e284de7b43ec807deee SHA-256: 231211116cd5cfbf457ef9144be000d732ee7d4ccb5a07efbdee26982c5bcb91
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable domains, suggesting a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://pelibifir.ru/award?keyword=ukulele+tabs+beatles+pdf PDF link annotation
    • https://judaromoperojog.weebly.com/uploads/1/3/2/6/132681758/bb688df4386b.pdfIn PDF document text
    • https://buwulikifem.weebly.com/uploads/1/3/4/5/134583505/37c270d722ab7.pdfIn PDF document text
    • https://xajaxosu.weebly.com/uploads/1/3/5/3/135304217/wupufe.pdfIn PDF document text
    • https://xaxozugine.weebly.com/uploads/1/3/2/3/132303195/cb7a55327d.pdfIn PDF document text
    • https://cdn.sqhk.co/gitovera/jgchbvP/33494311676.pdfIn PDF document text
    • https://cdn.sqhk.co/xetorexevapi/R11i8ei/roman_adventures_britons_season_1_walkthrough.pdfIn PDF document text
    • https://cdn.sqhk.co/mogudekusab/oigPeha/medanovefuvorusuzakuxet.pdfIn PDF document text
    • https://cdn.sqhk.co/sosobita/qiguCge/orange_cache_cleaner_pro_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/terasovo/gihdk1y/vuxive.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/temujonuwu/bifufaber.pdfIn PDF document text
    • http://sebiwafexudezo.rf.gd/50402154833.pdfIn PDF document text
    • https://8ed6bd9f-de2b-4923-b7df-82f95eb18a03.filesusr.com/ugd/7fa32f_911a69c590ba43e5a4afe8928a9ec176.pdf?index=trueIn PDF document text
    • http://wefugugis.epizy.com/birth_control_options_chart.pdfIn PDF document text
    • https://1c019786-7048-4615-837a-ae53f087c4ae.filesusr.com/ugd/8b4172_b14b07fa95954b6083c6e7b701129073.pdf?index=trueIn PDF document text
    • https://e7f45dcf-1957-410e-85b1-216e85a225c4.filesusr.com/ugd/a2c2bc_1cc4ce0c68b049d599540f79d92f892e.pdf?index=trueIn PDF document text
    • http://xopunuz.epizy.com/43119499289.pdfIn PDF document text
    • https://91e55214-10ad-44cf-a10a-60a9392df58b.filesusr.com/ugd/e1c37d_44540bad0fb940018a9f7725f5eb904b.pdf?index=trueIn PDF document text
    • https://bf6af823-cb0d-4ee8-9d5b-4f0b1de5ed24.filesusr.com/ugd/9eb187_a4a85ab0d9fc4e098b067a144f156d14.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/remuv/blue_devils_trombone_feature_2017_sheet_music.pdfIn PDF document text
    • http://xiparokenozi.epizy.com/bululawofetufigiran.pdfIn PDF document text
    • http://vefagukolile.epizy.com/gifujobuvekarazasi.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_off0000f1b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B4 5136 bytes
SHA-256: 30f553a542a95b0e001f38e1217acabeb04ffca9fa7d22934e5d500483467c67
font_01_sfnt_off00010346.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10346 10896 bytes
SHA-256: 413e1ce20b0f8dea8f3ec64207768d7627e9b2445923a3eab6628f257adc68bb