Malicious PDF — malware analysis report

Static analysis result for SHA-256 b648e1f3ee6bd569…

MALICIOUS

PDF

72.1 KB Created: 2021-09-11 21:38:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 08222cdaa548aca36711fd2b1f231c36 SHA-1: fafd44a9da23776ece10f306d394250d7c3fb03a SHA-256: b648e1f3ee6bd569f00a62aa1523df4a3395ac23dba9a9514b479be285f618a4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics identified it as a link farm with numerous disposable domains, suggesting a tactic to manipulate search engine results or distribute malware. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or content distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://sarvodayasamaj.uk/upload/files/simanediliri.pdf In PDF document text
    • https://coopinproject.eu/ckfinder/userfiles/files/vaxozib.pdfIn PDF document text
    • http://www.aragonemprendedor.com/userfiles/files/99314490068.pdfIn PDF document text
    • http://irk-yoga.ru/upload/files/kojakagowimelosuroloxufib.pdfIn PDF document text
    • http://aerotechgroup.ru/img/outer/files/29967018452.pdfIn PDF document text
    • http://tainanrup.longi.tw/uploadfiles/files/20210908_170014_1810.pdfIn PDF document text
    • http://alfavs.eu/userfiles/file/25191774090.pdfIn PDF document text
    • http://gyndoktors.de/ckfinder/userfiles/files/dojojatop.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613728b364001---80723345065.pdfIn PDF document text
    • http://kristiankutschera.de/userfiles/file/20826384813.pdfIn PDF document text
    • http://awarelaxcentrum.cz/user_files/file/89930080808.pdfIn PDF document text
    • http://email-database.info/userfiles/file/23426945438.pdfIn PDF document text
    • https://riosemarescentrodemergulho.com/ckfinder/files/zebudolax.pdfIn PDF document text
    • https://apskarota.org/userfiles/file/41069348512.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16135a7448dabe---fimozawerabovorujasorabo.pdfIn PDF document text
    • http://cloudinfo01.smartevolve.com/images/ckeditor/files/21335900774.pdfIn PDF document text
    • http://retailcop.ca/files/newetovevanisaj.pdfIn PDF document text
    • https://s-oil.hoakhanh.vn/uploads/image/files/60759514759.pdfIn PDF document text
    • https://bushregenerators.net/userfiles/files/wixiveregekag.pdfIn PDF document text
    • https://ibexquimica.com.br/ckfinder/userfiles/files/sonebumutomesemad.pdfIn PDF document text
    • https://rintrans.com/files/vitetumamuzino.pdfIn PDF document text
    • http://gbfrjournal.org/pds/userfiles/files/xusonubuza.pdfIn PDF document text
    • http://urbanposthotel.com/admin/ckfinder/userfiles/files/bazilonera.pdfIn PDF document text
    • http://sz-nuoyi.com/Upload/file/2021090122245572814.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/25376813142.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=angry+birds+seasons+apk+modPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b9c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9C7 10916 bytes
SHA-256: e972abb07d6fb2b4a167e3f63c6218d2c59c462c04da148bf98f203b097f4a6d
font_01_sfnt_off0000d2a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2A0 15688 bytes
SHA-256: 85dfd5c3c93d543b89e66f1e118c4e98357b38b0988b7a68ecf9e333ecbffca5
font_02_sfnt_off0000faac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAAC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1