Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1b9f0056253808f…

MALICIOUS

PDF

78.1 KB Created: 2021-09-21 19:31:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: db64063582d255c0de0598957af5fe1c SHA-1: b60cb1d83f2f9d78f6d254e6255b29a6aa20d504 SHA-256: e1b9f0056253808f77fe1c6e377a7fc8b087cce86b23d55f04b8e1b19c830971
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains or are structured as link farms, indicating a likely attempt to redirect users to malicious content. Although no scripts were explicitly extracted, the PDF structure and the presence of many external URIs suggest it is designed to exploit users by directing them to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://ip-kamera-rendszer.hu/ckfinder/userfiles/files/76308629303.pdf In PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/161489b257b3f0---rosixezaponufoxudu.pdfIn PDF document text
    • http://vizit-k.net/uploads/editor/files/jedulugepemeruziwexasi.pdfIn PDF document text
    • http://odessawa.com/userfiles/file/21414241595.pdfIn PDF document text
    • http://er-trans.com/img/produkty/files/33692819540.pdfIn PDF document text
    • https://bhandarisurgical.com/ckfinder/userfiles/files/13065694776.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161404842811ba---2413099552.pdfIn PDF document text
    • https://anup.bo/images/files/dusawurimowabefafuz.pdfIn PDF document text
    • https://asesoriagade.com/app/webroot/files/files/vikeguruxu.pdfIn PDF document text
    • https://europartner2.pl/uploads/dalineposunaf.pdfIn PDF document text
    • http://ebrinteractive.com/userfiles/file/90035392889.pdfIn PDF document text
    • http://l-max.ru/userfiles/file/70846348160.pdfIn PDF document text
    • http://irths.com/upload_files/files/jesiwagidawutegabupe.pdfIn PDF document text
    • https://vnsteeldetailing.com/UserFiles/files/jerurivubifonakejexu.pdfIn PDF document text
    • https://www.eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/lazarabos.pdfIn PDF document text
    • https://chiataiec.com/userfiles/Proj_Name/files/ninutozisil.pdfIn PDF document text
    • http://ternovykh.ru/content/file/95717358910.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/gamaninil.pdfIn PDF document text
    • https://tch.lu/files/files/gowomikujuragifateg.pdfIn PDF document text
    • http://komodovo.ru/upload_picture/gobugirejudizafifopukul.pdfIn PDF document text
    • http://tmkb.org.tr/ckfinder/userfiles/files/rutuw.pdfIn PDF document text
    • http://viethanit.vn/hinhanh/file/razivovogewomovoxazode.pdfIn PDF document text
    • http://avision-italia.com/userfiles/files/35758039932.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=gps+sygic+crackeado+para+androidPDF 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_off0000ca38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA38 18336 bytes
SHA-256: 48b499d5b341c6eb5134b140f50e90dc1742d3324e2b0fb25c9bb88feadf4250
font_01_sfnt_off0000fa5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA5C 10792 bytes
SHA-256: 1cc2f778fc08c883c49c6918b80436e0d31c45e512583ca8fcfae68ca39edb86
font_02_sfnt_off0001132c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1132C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1