Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7b009959cba3844…

MALICIOUS

PDF

74.5 KB Created: 2021-10-02 12:26:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 10a41c98e3e0683a12af9885dbba18eb SHA-1: 8edbb1cb8a25cec3036bf44227656935354105fb SHA-256: d7b009959cba3844e69dc3f816a0adb5f306332a5c97de058346336ce2713feb
134 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier. It contains embedded JavaScript, which is often used to exploit PDF vulnerabilities or redirect users. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a large number of links to potentially disposable domains, suggesting a link farm or phishing infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://lorus.rs/files/fuzalurasitodasuruvutewu.pdf In PDF document text
    • http://xn--12cmi2byac9cdhd0hra6d7bxkwbgj1gch.com/user_img/files/suredakomajit.pdfIn PDF document text
    • https://nbcmedia.vn/ckfinder/userfiles/files/rusisujef.pdfIn PDF document text
    • http://obkladacstvikolar.com/content/1235269749.pdfIn PDF document text
    • http://kimyasaldubeller.com/upload/ckfinder/files/pevesifasabeduf.pdfIn PDF document text
    • http://vititanon.com/user_img/files/kukidujozekibadameniv.pdfIn PDF document text
    • http://fcraregistration.com/UploadedData/file/rugalejuj.pdfIn PDF document text
    • http://ahjygjg.com/upload_fck/file/2021-9-3/20210903120043519931.pdfIn PDF document text
    • http://bbfederico2.net/userfiles/file/pumofimolinitoxokomud.pdfIn PDF document text
    • https://tramtron.vn/uploads/files/files/41008309153.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4c4a35f7f---sowagunakudegadafep.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/161492ea50af8d---63313626166.pdfIn PDF document text
    • http://albertf.madteam.net/ckfinder/userfiles/files/pojobakug.pdfIn PDF document text
    • http://ginzaramen.us/uploads/files/redib.pdfIn PDF document text
    • https://canionglobal.com/FCKeditor/file/57686627194.pdfIn PDF document text
    • http://barexkft.hu/userfiles/file/43528540351.pdfIn PDF document text
    • http://timebymtm.com/upload/files/dugatuvixukiso.pdfIn PDF document text
    • https://marupyara.com/fotos/userfiles/file/58026267005.pdfIn PDF document text
    • https://kermoulin.com/userfiles/file/moxotimoxanipumujobigur.pdfIn PDF document text
    • https://kaptenhoki.org/contents/files/48912862905.pdfIn PDF document text
    • https://tcremich.lu/files/files/xiribup.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/67747009399.pdfIn PDF document text
    • https://alienaquatics.com/home/gb/public_html/ckfinder/userfiles/files/19370831098.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=starred+question+and+unstarred+questionPDF 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_off0000bd00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD00 18452 bytes
SHA-256: 4d3eeb5bb923d3e602f4c7ba6863cf6c4deb8a6c4f2f74343e7fd607340fab3d
font_01_sfnt_off0000ec64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC64 10516 bytes
SHA-256: 551b25a31b4786ef9a3b21d584ca1319752e1a9a01e6271465254639ac4efcca
font_02_sfnt_off00010432.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10432 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1