Malicious PDF — malware analysis report

Static analysis result for SHA-256 fad2c592b0346a1a…

MALICIOUS

PDF

83.2 KB Created: 2021-09-17 16:38:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 390df364510e3853f1c82de97c647596 SHA-1: a9742195bd244d68d41ba1ca442d8a068767f16a SHA-256: fad2c592b0346a1a490f963e7a51fc91c21c1e97223cfc220e7235a1d88a4b80
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, with one heuristic specifically identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and numerous external URIs suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pistant.ru/uplcv?utm_term=clownfish+voice+changer+for+teams PDF link annotation
    • https://escolaalfa.com/userfiles/file/77085646265.pdfIn PDF document text
    • http://rfaaa.com/UploadFile/file/20210906130524228.pdfIn PDF document text
    • http://csc0311.com/userfiles/file/20210910095454_xb7g59.pdfIn PDF document text
    • https://cargotavio.ru/files/file/26097617817.pdfIn PDF document text
    • http://fotofolliasanlazzaro.it/userfiles/files/56316281603.pdfIn PDF document text
    • http://rollfactorytogo.com/uploads/files/bubatepewad.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161417819b9034---vuzuvirivolewaru.pdfIn PDF document text
    • http://xn--80aamwn.xn--p1ai/userfiles/file/pivadejinafipi.pdfIn PDF document text
    • http://all-paca.com/ckeditor/ckfinder/core/connector/php/uploads/files/97427758265.pdfIn PDF document text
    • https://toananhmedical.com/uploads/files/60329127913.pdfIn PDF document text
    • https://full-flavors.com/img/Data/file/kamijavigibika.pdfIn PDF document text
    • https://toananhmedical.com/uploads/files/86168547241.pdfIn PDF document text
    • http://ageddfjtjgrade.pretty-match.com/upload/files/12973756553.pdfIn PDF document text
    • http://at2apigroup3.com/contents/files/96485976105.pdfIn PDF document text
    • https://xn--interpeas-r6a.es/upload/files/padubonusilugomakolaxat.pdfIn PDF document text
    • https://textolinguisticsolutions.com/upload/editor/file/42141732657.pdfIn PDF document text
    • http://safetyassessmentsolutions.co.uk/ckfinder/userfiles/files/jepiratibidapazepepa.pdfIn PDF document text
    • http://raczcsalad.hu/files/rameronadozegeru.pdfIn PDF document text
    • https://braus.uz/images/shared/file/sabuna.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dfb3534d25---numisiketemozowaxosiwo.pdfIn PDF document text
    • https://u15.ch/ckfinder/userfiles/files/xekawazidulefope.pdfIn PDF document text
    • http://dui-antidote.net/images/userfiles/file/60749928374.pdfIn PDF document text
    • http://btsoft.vn/uploads/files/29351055519.pdfIn PDF document text
    • http://cpgny.com/userfiles/files/8780657447.pdfIn PDF document text
    • http://jubileejec.com/userfiles/files/66121051904.pdfIn PDF document text
    • https://globalybm.com/ckfinder/userfiles/files/1631330195.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://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_off0000dd4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD4A 10964 bytes
SHA-256: 8c1ec6458bbfad0a92a8a75c76bbea2bf889bea253fb1c1bd7e98e2dd0ee1de9
font_01_sfnt_off0000f6ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6AB 18580 bytes
SHA-256: abb5f8753809e414c8584ce525f1141cf8bb38d1a89787ecc313c9223cb27b39
font_02_sfnt_off000126b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1