Malicious PDF — malware analysis report

Static analysis result for SHA-256 37ca24899a460edb…

MALICIOUS

PDF

83.9 KB Created: 2021-09-13 20:28:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b7a868fce4e75ab0f67471592604820c SHA-1: 2c168327a7c60725a323152a250cd3414decdc02 SHA-256: 37ca24899a460edb8dce9a3815e805528e0edaf9b604d44e7c43b5c5b88eaab1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, a common tactic for phishing or distributing further malware. The embedded URLs point to various unknown domains, reinforcing the suspicion of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://vendax.ro/files/file/50990684870.pdf In PDF document text
    • https://marblo.marblobaths.ph/app/webroot/img/files/tozoziv.pdfIn PDF document text
    • https://pasarangroup1.com/contents/files/balabekolufezuvub.pdfIn PDF document text
    • https://pensionradvanice.cz/res/file/48351676312.pdfIn PDF document text
    • http://zit-tech.com/userfiles/files/59415821549.pdfIn PDF document text
    • http://icsbc.ru/fuploader/file/dozisivapunofakurowasejo.pdfIn PDF document text
    • http://hamishehbaharcarpet.com/My_Project/Hamishe_bahar/ahar_img/files/padavize.pdfIn PDF document text
    • https://homestayhoian.vn/uploads/image/files/8360528469.pdfIn PDF document text
    • http://danieldesignpro.com/userfiles/97201243997.pdfIn PDF document text
    • https://sandp-engineering.com/ckfinder/userfiles/files/29514599554.pdfIn PDF document text
    • http://secureyun.cn/uploadfile/file///2021090803005832.pdfIn PDF document text
    • http://skkouty.cz/ckfinder/userfiles/files/42794256394.pdfIn PDF document text
    • https://umiyawoodworks.com/fckdb/userfiles/file/64998988455.pdfIn PDF document text
    • http://rfaaa.com/UploadFile/file/20210913221138858.pdfIn PDF document text
    • http://kovospm.cz/fotky/file/rixudoxajogibuw.pdfIn PDF document text
    • http://www.binghan.my/userfiles/file/zewawenizilunefapoloxevi.pdfIn PDF document text
    • http://www.ximangsongthao.com/app/webroot/uploads/files/kixalumujaxoduziged.pdfIn PDF document text
    • https://www.nevjegykiraly.hu/userfiles/files/42523793910.pdfIn PDF document text
    • http://thetsaban3watnuea.com/UserFiles/file/gegexajomugoti.pdfIn PDF document text
    • https://ita.kru.ac.th/ckfinder/userfiles/files/6800568227.pdfIn PDF document text
    • http://3bbb.fr/ckeditor/upload/files/49045005420.pdfIn PDF document text
    • http://chochosanencino.com/uploads/files/dowirogegonos.pdfIn PDF document text
    • http://nextlab-semi.com/files/fckeditor/file/vafunej.pdfIn PDF document text
    • https://aldapa.eus/files/galeria/files/53760258363.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=my+android+camera+is+blurryPDF 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_off0000de92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE92 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A9 10780 bytes
SHA-256: 8cc544b5e2c5e62e5089e9fc5993ac1f67d91c6ea914b00ccb5cff25f2ff0d54
font_02_sfnt_off00010f6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F6A 19172 bytes
SHA-256: 8df1731ac5c80c4b3c278be27c184cc4e542cd491fc00054ed24242dc097d7e8

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