Malicious PDF — malware analysis report

Static analysis result for SHA-256 d62781c5b17e8af0…

MALICIOUS

PDF

94.9 KB Created: 2021-06-09 15:07:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 06aa5e8e5e00ae76ae2e6c931fb147fc SHA-1: e4c962888ca223155eb18f22e4b580ec5f28576c SHA-256: d62781c5b17e8af02ca4d7edc80db3b35e625c57c27078c48ad7888c732262ab
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are part of a link farm designed to obscure the ultimate destination. The primary URL, https://wastran.ru/pbw?utm_term=minecraft+pc+offline+installer, suggests a lure for downloading software. ClamAV detection and ML classification strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://wastran.ru/pbw?utm_term=minecraft+pc+offline+installer PDF link annotation
    • https://static.s123-cdn-static-d.com/uploads/4369333/normal_60aff3f384734.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402737/normal_6032dacc7779a.pdfIn PDF document text
    • https://bojibelatos.weebly.com/uploads/1/3/4/0/134040608/pigelaji.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420597/normal_602a27b01abac.pdfIn PDF document text
    • https://piroveda.weebly.com/uploads/1/3/2/7/132740505/6945b97aebc87.pdfIn PDF document text
    • https://zejapajidifipi.weebly.com/uploads/1/3/4/3/134319351/1fc2006fa5b4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489415/normal_60436a7ed8c5c.pdfIn PDF document text
    • https://zuwufapiju.weebly.com/uploads/1/3/5/3/135348861/df9bd8e6a34fc.pdfIn PDF document text
    • https://faruroju.weebly.com/uploads/1/3/5/9/135986438/254e62.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501233/normal_6056e8c04261d.pdfIn PDF document text
    • https://dexajuvado.weebly.com/uploads/1/3/4/4/134470202/8415557.pdfIn PDF document text
    • https://lugekovatisemo.weebly.com/uploads/1/3/5/3/135337030/ded22088cf5d.pdfIn PDF document text
    • https://noxomawap.weebly.com/uploads/1/3/5/9/135981563/fapakefekeriw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fujiserefi.pbworks.com/w/file/fetch/144767676/xavukefatiw.pdfIn PDF document text
    • http://zufumegi.pbworks.com/f/43359997061.pdfIn PDF document text
    • http://gutopevif.pbworks.com/f/11._snf_arapa_ders_kitab_cevaplar.pdfIn PDF document text
    • http://pebenuziwi.pbworks.com/f/zagoga.pdfIn PDF document text
    • http://noxiwako.pbworks.com/w/file/fetch/144524520/zatemezarifakiwudeg.pdfIn PDF document text
    • http://jolunatimavu.pbworks.com/f/3ds_gba_qr_codes.pdfIn PDF document text
    • http://kevuxezedila.pbworks.com/w/file/fetch/144814842/different_methods_of_nutritional_assessment.pdfIn PDF document text
    • http://mugobug.pbworks.com/w/file/fetch/144949617/website_download_film_thailand.pdfIn PDF document text
    • http://xuwuziz.pbworks.com/f/functional_specification_document_template_in_sap.pdfIn PDF document text
    • http://togusan.pbworks.com/f/85491153343.pdfIn PDF document text
    • http://febigadeviti.pbworks.com/w/file/fetch/144926460/41809632934.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_off0000eecf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEECF 23996 bytes
SHA-256: c2a16d9e4b2a73e997b7e7b60c3f762e9ddc5981ad5960459dc07353b25ffdfa
font_01_sfnt_off000133bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133BC 5012 bytes
SHA-256: 5ae1541e0b810885dd0689c8a3b0345125b45bddb879c04234631bf3a2ef2552
font_02_sfnt_off000144e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144E5 11916 bytes
SHA-256: 3799958ebe910838391c5f57b372a9bf2082869cb34c23fed972d8a583fc6d46