Malicious PDF — malware analysis report

Static analysis result for SHA-256 22376edc9928129f…

MALICIOUS

PDF

69.9 KB Created: 2021-09-26 00:00:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e49e4185564cbf16a2f23115a06fc9bf SHA-1: 3ddf9a71088f18b72cc185c908cf57ff2fb006f5 SHA-256: 22376edc9928129fdfbbda0d59067efbd7231bf657fb9773c68fc4dcf493fc79
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, consistent with a link farm designed to redirect users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the ClamAV detection 'Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0' strongly indicate a phishing or malware distribution intent. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's intended to be opened and interacted with, likely leveraging embedded JavaScript for redirection or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://ketchas.ru/uplcv?utm_term=keche+ft+kuami+eugene PDF link annotation
    • http://ephtour.com/FileData/ckfinder/files/20210921_4C9E3B998643363F.pdfIn PDF document text
    • https://maychieuvinh.vn/upload/files/ratutabowit.pdfIn PDF document text
    • http://nachhilfeschule.havonix.com/ckfinder/userfiles/files/zukafebepetedo.pdfIn PDF document text
    • http://vanlysecurity.vn/vanly/album/files/zikunixegujozelibokegaz.pdfIn PDF document text
    • https://bevillelecomte.com/ckfinder/userfiles/files/38699381282.pdfIn PDF document text
    • http://boras-sjuharad.boj.se/uploads/userfiles/files/19531792861.pdfIn PDF document text
    • http://smepil.com/ckeditor/userfiles/files/92205441061.pdfIn PDF document text
    • https://www.pelicanfinancialnetwork.com/ckfinder/userfiles/files/bamofeponidutuge.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/161408f3c77efc---26708881890.pdfIn PDF document text
    • http://terminsk.by/pics/files/59729418490.pdfIn PDF document text
    • http://uceng.net/_UploadFile/Images/file/26202568636.pdfIn PDF document text
    • http://miyisz.com/mingyi/images/userfiles/file/10605990022.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/ferh490tb2el8btke0lv81rns4/31604804553.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/nipixisujadamisumepusem.pdfIn PDF document text
    • http://abcbyspu.net/ckfinder/images_store/files/sedubogur.pdfIn PDF document text
    • https://narellesastro.com/userfiles/files/tafubibuwelesozameri.pdfIn PDF document text
    • https://noursportevents.com/wheelmarine/userfiles/file/puvopajat.pdfIn PDF document text
    • https://ukmalayalamnews.com/userfiles/file/gekotunowedidesipinafe.pdfIn PDF document text
    • https://ginniglobal.com/uploads/file/xilirudatoxuxeponevodelu.pdfIn PDF document text
    • https://ehotelgateway.com/bot/ckfinder/uf/files/zusasutigupofabuxorejebug.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_off0000b221.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB221 15712 bytes
SHA-256: aadfd0190f2b8289c6ca103266312505d55c80cf2ad6a254da92de2610b336a8
font_01_sfnt_off0000da45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA45 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f25c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF25C 10532 bytes
SHA-256: b4d36c71c935b99b24fd08102e0861cd3d251a26e861f55b14a69149dcdb5255

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