Malicious PDF — malware analysis report

Static analysis result for SHA-256 239bb1ac6cd05e6b…

MALICIOUS

PDF

77.9 KB Created: 2021-05-11 18:16:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: f87b1199812906204f8ca546b59a34b6 SHA-1: cbf328c248972fd19fc402b3f1ae739e6dd1049a SHA-256: 239bb1ac6cd05e6bcbc61f3034a29f31f3b4b8032985442905883ae98a7c3c1f
126 Risk Score

Malware Insights

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

The PDF file contains numerous links to external websites, many of which are hosted on disposable domains and appear to be part of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. The embedded URLs suggest an attempt to redirect users to malicious content, potentially as part of a broader phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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 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/strik?utm_term=old+testament+certificate+of+divorce PDF link annotation
    • http://purubeta.iblogger.org/theodor_adorno_minima_moralia.pdfIn PDF document text
    • http://lobabinuladeri.medianewsonline.com/naligibarubuvopatejilim.pdfIn PDF document text
    • http://xakidofe.sportsontheweb.net/84462034015.pdfIn PDF document text
    • http://jetinaxisodew.mypressonline.com/finanzas_bursatiles_gamaliel_ayala_brito.pdfIn PDF document text
    • http://zefutuwukeras.getenjoyment.net/tewatutiminizuvabefix.pdfIn PDF document text
    • https://xidumalebuwun.weebly.com/uploads/1/3/4/8/134894794/96a8d5e1cd345eb.pdfIn PDF document text
    • http://posurazatux.mypressonline.com/bengali_comics_books_free_download.pdfIn PDF document text
    • https://wajabanafeku.weebly.com/uploads/1/3/4/5/134599300/4917800.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402252/normal_606b1791ca23c.pdfIn PDF document text
    • https://ximixejolulozo.weebly.com/uploads/1/3/4/3/134351986/tetisizusutasu.pdfIn PDF document text
    • http://euroshopmn.space/13105550571j8r7b.pdfIn PDF document text
    • http://kuroramogesok.iblogger.org/pawimedazefulakidusaxavux.pdfIn PDF document text
    • http://supermagazforsale1.xyz/100_protocolos_de_auriculoterapia_gratis215bi.pdfIn PDF document text
    • http://italywow.info/zotokomoxotetozavumikerguva4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393925/normal_600d7ffdd78d4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d5128c9-e481-4d1e-824d-65fcc77c4201/how_to_make_him_love_u_through_text.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0545933b-0f2d-4cc2-9e0d-633b4cf0e14b/how_to_excel_formulas_in_hindi.pdfIn PDF document text
    • http://divasopib.rf.gd/65749743519.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5aa70d53-b657-4777-921c-b5b59dc25b45/64965573657.pdfIn PDF document text
    • http://fabodatutowew.epizy.com/42751455586.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c6eb198-325a-4877-a6b6-8961e552f3c4/biochemistry_book_berg.pdfIn PDF document text
    • http://redexini.epizy.com/xufirapatevob.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_off0000f4ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4FF 5252 bytes
SHA-256: a8a9761a44908ba1389ab4b4c8ec822727d569a2b4fcaeaaa25d4c6e7f5f7c86
font_01_sfnt_off000106ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106CE 10248 bytes
SHA-256: 2b7bc5a6ff6e41430401ad6ca27fb3665e3f0b88b7baac4c3dceb2ab896eca61