Malicious PDF — malware analysis report

Static analysis result for SHA-256 9214556aa2126041…

MALICIOUS

PDF

70.7 KB Created: 2021-09-17 12:01:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e98be1109a5da0fc44d82d76d8e790b8 SHA-1: cacd81ea67499cbdd056fbf0f37dc50be4aea573 SHA-256: 9214556aa2126041ff7511ee43b9c736d0d6dfafcd04dfc407c5970c22189a8c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, with high confidence. Heuristics indicate it functions as a link farm, containing numerous external URIs pointing to disposable domains. The primary purpose appears to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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 http://xn----7sbabaajmdfbk3ddf3azka3b6a2r.xn--p1ai/ckfinder/userfiles/files/35806539308.pdf In PDF document text
    • http://www.moyekolodin.com/files/zazoma.pdfIn PDF document text
    • https://wfca-czech.cz/temp/userfiles/files/zeribowabupisabobipeval.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/16140e40e08ca7---14207778791.pdfIn PDF document text
    • http://prakseologia.eu/userfiles/file/73071850083.pdfIn PDF document text
    • http://www.fan-consultants.com.tw/ezadmin/ckfinder/userfiles/files/xutilibefuvaruzapixite.pdfIn PDF document text
    • https://www.acta-mobilier.fr/ckfinder/userfiles/files/xafixonisokolobe.pdfIn PDF document text
    • https://oasis-travel.ro/files/75613504422.pdfIn PDF document text
    • http://www.agenbenangbandung.net/file/12168324767.pdfIn PDF document text
    • https://spvi.cn/filespath/files/20210905103209.pdfIn PDF document text
    • http://quetthe.com/upload/files/65737312229.pdfIn PDF document text
    • https://psystat.net/candyticket/uploads/page_images/files/bomepurezopuwosijok.pdfIn PDF document text
    • http://asu78.ru/userfiles/file/42156028923.pdfIn PDF document text
    • https://bongkartuantakur.com/contents/files/61645817238.pdfIn PDF document text
    • http://jsushibrea.com/uploads/files/86232778781.pdfIn PDF document text
    • https://estoniapools.com/contents/files/28591613677.pdfIn PDF document text
    • https://quangcaowebsitecomvn.xemlaco.com/uploads/files/85693433223.pdfIn PDF document text
    • http://lawyergz.net/uploadfile/files/98533800547.pdfIn PDF document text
    • https://b2cexpressdemo.com/userfiles/file/67743442814.pdfIn PDF document text
    • https://dogathermalhotel.com/resimler/files/topefow.pdfIn PDF document text
    • http://juha.be/_files/file/90183936832.pdfIn PDF document text
    • https://sgotomotiv.org/upload/files/23549177326.pdfIn PDF document text
    • https://pharma-tools.eu/galeria/file/81355749764.pdfIn PDF document text
    • http://jinistudy.com/_UploadFile/Images/file/sasexinanigumizu.pdfIn PDF document text
    • http://dealershop.es/userfiles/file/56546056596.pdfIn PDF document text
    • http://www.hebrewforreadingcomprehension.com/content/gabep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=cool+google+apps+for+androidPDF 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_off0000b56a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB56A 10604 bytes
SHA-256: 84c1d1f29335beaaf805db237e5dedf54ae9bf76a5945c5a72056087295cc748
font_01_sfnt_off0000cd8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD8E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e5a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5A0 15640 bytes
SHA-256: 148a8d630982e3628489823db4eda7ef8d79fe29f04d74ac13584f7d651945d8

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