Malicious PDF — malware analysis report

Static analysis result for SHA-256 e266e654283e3c63…

MALICIOUS

PDF

73.5 KB Created: 2021-09-30 10:08:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ea5bb4c58ddeb4be859ad7f95861cf32 SHA-1: 71bde93ebba89427a14a363765f697d87c86d8d5 SHA-256: e266e654283e3c63313fda0ada06857750c9a8c195b24329c93337e8a412e7dc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://coretry.ru/uplcv?utm_term=how+to+change+picture+date+on+android PDF link annotation
    • https://cvsc.co/userfiles/file/nineg.pdfIn PDF document text
    • https://veriniams.lt/userfiles/file/sojomapuwaxufiredefa.pdfIn PDF document text
    • http://siblom.ru/files/upload/file/dosasedegofikalusux.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614224643efc7---dikope.pdfIn PDF document text
    • http://baschin-heizung.de/meineBilderAlbertGrundschule/file/13168149758.pdfIn PDF document text
    • http://biolabsrl.org/userfiles/files/bigejobofi.pdfIn PDF document text
    • http://righetti-ticozzi.it/userfiles/files/26038595894.pdfIn PDF document text
    • http://abwrva.com/uploads/files/71717636043.pdfIn PDF document text
    • https://dunakanyarfesto.hu/ckfinder/userfiles/files/82913561461.pdfIn PDF document text
    • http://sevvalturizm.com/rsm/files/mibatodebexusenonanoj.pdfIn PDF document text
    • http://mrs-edu.com/sribati/editor/uploadfiles/gixiwowexewavedijusoliko.pdfIn PDF document text
    • https://sunarchegypt.com/userfiles/file/jebofazefesorarutavix.pdfIn PDF document text
    • http://www.frank-diagn.hu/userfiles/files/82446680119.pdfIn PDF document text
    • http://youzedu.com/ckimages/files/20210909142358419812.pdfIn PDF document text
    • http://www.jfac.kr/ckfinder/userfiles/files/75938846643.pdfIn PDF document text
    • http://d-a-s.cn/userfiles/file/14641071905.pdfIn PDF document text
    • http://audyt.rowerowaszkola.pl/imgturysta/files/tilasanelepuj.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_off0000b868.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB868 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d07f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD07F 10756 bytes
SHA-256: 02e265bc587928eaa4af97781fb4c72b94cd453271b500cd73dfde4f06b6da01
font_02_sfnt_off0000e8fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8FD 18164 bytes
SHA-256: b212ed003b0d0c8c6745d18cca8108cbace97a56134ba0a9b533fe1f1643def5

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