Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f6489090a43f4a7…

MALICIOUS

PDF

75.0 KB Created: 2021-09-21 11:21:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: e1aac9cf3c071a2fac21fb2b8362500e SHA-1: 16ea4460dde296e047bf1d9941bc200e47dd1e75 SHA-256: 2f6489090a43f4a763e00f9e926e51468cfa8a420b2a34311cc7afd991e511d0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to disposable hosting, indicative of a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest it is designed to redirect users to malicious sites, likely leveraging techniques such as spearphishing attachments to deliver the initial malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://oniceh.ru/uplcv?utm_term=update+app+in+play+console PDF link annotation
    • https://gionggiacam.com/ckfinder/userfiles/files/sepepekujatageno.pdfIn PDF document text
    • http://comitatoamiantovelodromo.org/userfiles/file/towiwixizupogor.pdfIn PDF document text
    • http://cheliabinsk.realxenon.ru/uploads/files/70759141107.pdfIn PDF document text
    • http://apisicul.com/userfiles/files/72222123280.pdfIn PDF document text
    • http://sun-green.de/ckfinder/userfiles/files/89307534526.pdfIn PDF document text
    • http://engineersclasses4competition.com/files/others/vonejesonorugoke.pdfIn PDF document text
    • http://www.ktgroup.co.uk/ckfinder/userfiles/files/sunoredunexutitobugifeduz.pdfIn PDF document text
    • http://xn--80ahcjevtqq.xn--p1ai/ckfinder/userfiles/files/papavozozusak.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/8455937769.pdfIn PDF document text
    • https://www.osteopathe-montpellier-sud.fr/ckfinder/userfiles/files/70754406609.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161379c7f077e8---94020270609.pdfIn PDF document text
    • https://yk-tech.com.tw/ckfinder/uploads/ckfiles/files/fulesofezuselog.pdfIn PDF document text
    • https://tonere.shop/app/webroot/files/userfiles/files/fawipevuwibujivoz.pdfIn PDF document text
    • http://caycanh.vn/images/fck/file/78046480742.pdfIn PDF document text
    • http://www.jfac.kr/ckfinder/userfiles/files/xatuxereveza.pdfIn PDF document text
    • http://hotelamadeustorino.com/userfiles/files/28578920113.pdfIn PDF document text
    • https://bda.ch/ckfinder/userfiles/files/geririsojuz.pdfIn PDF document text
    • http://peggylittlelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/40412732487.pdfIn PDF document text
    • http://ghefoot.com/fckeditor_userfiles/file/29882042937.pdfIn PDF document text
    • http://starma.pl/files/file/kunodiwaxo.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_off0000c188.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC188 10528 bytes
SHA-256: 65df2bc6b78f9feb2cb081c7e519f5ce7d5c2bde944cbf50f98f6c5383597db4
font_01_sfnt_off0000d9a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9A6 17300 bytes
SHA-256: 81e2998949d1fdb223e36df05210260a2163f0be44ab5fbf0ec438dff0a66ca9
font_02_sfnt_off000106b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1