Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5e92dba143727c6…

MALICIOUS

PDF

80.7 KB Created: 2021-09-24 11:20:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b6951682c7b3d6826e6e11e04ed173eb SHA-1: 426826ad5782010bbb685317f9b77b5bd3367535 SHA-256: e5e92dba143727c6d421389908eb932b7aa841e524625c07b814f3a31f5e8bfa
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, with one specifically pointing to 'ketchas.ru' and another to 'topopentertainment.com', suggesting an attempt to redirect users to potentially harmful sites. The PDF structure and the presence of external URIs are indicative of a phishing lure.

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://ketchas.ru/uplcv?utm_term=2k19+locker+codes PDF link annotation
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614baf087883b---88745354726.pdfIn PDF document text
    • http://personal.sut.ac.th/chantira/port/ckfinder/userfiles/files/zorijirodidisijilapis.pdfIn PDF document text
    • http://montpellier-businessplan.fr/mbp/upload/images/images/upload/ckfinder/18948232589.pdfIn PDF document text
    • http://sinocelltech.com/filespath/files/20210920020834.pdfIn PDF document text
    • https://jagamimpi.org/contents/files/buxopopazapi.pdfIn PDF document text
    • http://laskod.hu/userfiles/file/wavamibigifalori.pdfIn PDF document text
    • http://webinaris.org/ckfinder/userfiles/publics/files/kavobirawumilo.pdfIn PDF document text
    • https://hoangphatdanang.com/uploads/image/files/gabirinasewarodagubovusux.pdfIn PDF document text
    • http://t-eamplus.de/web/editor/files/7946242316.pdfIn PDF document text
    • http://chono.mn/uploads/userfiles/files/mejogefabewevinivil.pdfIn PDF document text
    • https://dovolena-jiznicechy.cz/uploads/81950131642.pdfIn PDF document text
    • http://indemo.pl/Image/files/xafanadoximuriga.pdfIn PDF document text
    • http://myxroad.net/upload/userfiles/file///69400144235.pdfIn PDF document text
    • https://whatproperty.ng/ckfinder/userfiles/files/44132058237.pdfIn PDF document text
    • http://computergramm.com/userfiles/file/josekuret.pdfIn PDF document text
    • http://hamzalegalservices.com/userfiles/file/6721542216.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/94409668734.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/fexosafirekofevorenewa.pdfIn PDF document text
    • http://location-appartement-venise.com/italie_documents/files/14502515422.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/16146883b6403b---20581104220.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_off0000d5d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ede6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE6 18660 bytes
SHA-256: 39dfa63df77bb1d04f9025387aba7a6453673e4fe70a1b808a689754c5e133b2
font_02_sfnt_off00011e47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E47 10240 bytes
SHA-256: 661f46a6e092c01c264c4d14caa6f4d02dc1c09614e4adc431f241f21f10ae71

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