Malicious PDF — malware analysis report

Static analysis result for SHA-256 28bb0d609e9dbe99…

MALICIOUS

PDF

80.8 KB Created: 2021-09-18 02:11:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2d29ebe9af85eb3874f47fe1e12a24eb SHA-1: 1af6ce31115beee88c03730cdd4ae4bc6304be10 SHA-256: 28bb0d609e9dbe9975825b9ac1116d91cf345f57d9758c4781b104dbac6513d8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm PDF. It contains numerous external URIs pointing to various domains, suggesting an attempt to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate it's designed to exploit users by directing them to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://synerhu.ru/uplcv?utm_term=bloxburg+houses+under+20k PDF link annotation
    • https://callmarkinvestments.fortunekenya.com/callmark/files/59278564373.pdfIn PDF document text
    • https://recrut.com/files/files/96491877018.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/fibekurekegabefoka.pdfIn PDF document text
    • http://futureinfashion.com/ckfinder/userfiles/files/19229101819.pdfIn PDF document text
    • http://studiotecnicodambra.eu/userfiles/files/97252924467.pdfIn PDF document text
    • https://soportedevida.mx/ckfinder/userfiles/files/87283474392.pdfIn PDF document text
    • http://xn----0tbbbfo0f.xn--p1ai/userfiles/file/2061391104.pdfIn PDF document text
    • https://flyags.com/editorResources/file///ximojusovomivokalixejudo.pdfIn PDF document text
    • http://vdi.vn/userfiles/file/165085372.pdfIn PDF document text
    • https://snqrsl.quebec/upload/editor/file/mepuzu.pdfIn PDF document text
    • http://labsshop.com/d/files/texofazu.pdfIn PDF document text
    • http://coffee33.ru/archive/file/dolazunipu.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/fakimavofo.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e4b47ad1d8---45493951643.pdfIn PDF document text
    • http://edwardfmcgintypa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wuvirexuvukaje.pdfIn PDF document text
    • https://inprovitcolombia.com/ckfinder/userfiles/files/80892364325.pdfIn PDF document text
    • https://immo-cjeanpaul.lu/userfiles/files/50686946434.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/71b6a7e0d7016fb330ed16374e6b8068/51670017436.pdfIn PDF document text
    • https://rowsontw.com/shopadmin/upload/files/47882656685.pdfIn PDF document text
    • http://sushi-belovo.ru/files/72915572296.pdfIn PDF document text
    • https://slezanie.eu/userfiles/file/zozijetenetamigarede.pdfIn PDF document text
    • http://frutapac.es/ckfinder/userfiles/files/51438300447.pdfIn PDF document text
    • http://kondicionery-pushkino.ru/upload_picture/file/sugaxetovizafozusasasuzi.pdfIn PDF document text
    • https://jss-moms.si/upload/File/42997207802.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_off0000d6b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6B7 17740 bytes
SHA-256: 531ae5bb7e3ff1d8d4ff8244ceec252a25329f867c05d5573faec421f115f475
font_01_sfnt_off000104ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011cc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CC4 10904 bytes
SHA-256: bec39b38365447c08309a0d11f61c92ce41358d8e0f115a073917466cac0fe81