Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe3684aa65cc96c7…

MALICIOUS

PDF

79.6 KB Created: 2021-09-11 12:25:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 17c1168154cd43e8b51c2b97298978ef SHA-1: 8fa722751066222dfd32381fc0adbdbe42f79d74 SHA-256: fe3684aa65cc96c7a00389b125260e5be2035fc22643504eba053a168bd2315b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external PDF files hosted on potentially disposable domains. While no scripts were directly extracted, the nature of the PDF and its embedded links suggest an intent to redirect users to malicious content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

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 http://nathulaldasptti.com/ckeditor/ckfinder/userfiles/files/85284161091.pdf In PDF document text
    • https://nmcs.ca/userfiles/files/62979134072.pdfIn PDF document text
    • https://www.supremecaravans.com.au/application/third_party/ckfinder/userfiles/files/43949627317.pdfIn PDF document text
    • https://orsam.org.tr/paketler/ckfinder/dosyalar/files/zafaruwabusagobuw.pdfIn PDF document text
    • http://pc580.cn/upload_fck/file/2021-9-6/20210906195552694353.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/nogimilofowidiw.pdfIn PDF document text
    • https://sonerofset.com/userfiles/file/32341443429.pdfIn PDF document text
    • https://cpsguffanti.com/uploads/file/xebom.pdfIn PDF document text
    • https://bursac.net/userfiles/file/17435891810.pdfIn PDF document text
    • http://sibleyestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/28184503751.pdfIn PDF document text
    • https://bomberosdenavarra.com/userfiles_nexo/files/63196568276.pdfIn PDF document text
    • https://rowsontw.com/shopadmin/upload/files/leful.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16131335c47c1c---dugezusafesud.pdfIn PDF document text
    • http://asid.rw/userfiles/file/mebutuvorakafonisiwazul.pdfIn PDF document text
    • https://sausalito.com/wysiwygfiles/file/36060097196.pdfIn PDF document text
    • http://braciszewska-klimek.pl/fck_files/file/tujuladadevizesin.pdfIn PDF document text
    • https://geneolock.com/ckfinder/userfiles/files/makobafujolibet.pdfIn PDF document text
    • http://santamariamikado.com/uploads/files/wofebaxomiramipakemadema.pdfIn PDF document text
    • http://argyleliquidations.com/userfiles/files/nukukuxavokivojes.pdfIn PDF document text
    • http://studiotecnicoligioni.com/userfiles/files/gulagoxudoladapumali.pdfIn PDF document text
    • http://mictrogiang.com/userfiles/files/79322937152.pdfIn PDF document text
    • http://kiddeefire.com/media/userfiles/files/86044456284.pdfIn PDF document text
    • http://galaxyjewel.cn/uploadfile/files/54472133350.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=adb+firmware+flashPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b63f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB63F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE50 16348 bytes
SHA-256: eaecd8d8fd522c10bb6c38e7bcc7847058292b0b1d3079742b93441128788822
font_02_sfnt_off0000e4c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C1 10504 bytes
SHA-256: 22c4c175f86c6bcd8ccd4e64090d691094d85e236de3d6e79ce3593d3c8a0073
font_03_sfnt_off0000fca4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA4 19960 bytes
SHA-256: 3e2c0acdd743cc368abbcea150b2f702f955d99f1e00fc6408976ecb353f38ed