Malicious PDF — malware analysis report

Static analysis result for SHA-256 253ef6cc502039e6…

MALICIOUS

PDF

72.6 KB Created: 2021-09-11 09:43:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 793c3fb6047121815e141ef749edd6e9 SHA-1: a3973ffaf351dbb60cf41ecace35007c9200fea3 SHA-256: 253ef6cc502039e698872ca6595c585612f8de1f20ef39aeca630024cb0588cc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to external files, suggesting it acts as a lure to download further malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating a pattern of using disposable hosting for link distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://files.ibiza-ferien.de/file/39361205192.pdf In PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-9-1/20210901213441585942.pdfIn PDF document text
    • http://ekopaczka.pl/imgbrama/files/38131590139.pdfIn PDF document text
    • https://hlj-vibration.com/uploads/image/20210906/files/20210906180230.pdfIn PDF document text
    • https://jlgardner.org/home/jlg/public_html/ckfinder/userfiles/files/2550257110.pdfIn PDF document text
    • http://boldogelet.hu/media/54864257452.pdfIn PDF document text
    • http://otworz-biuro-podrozy.pl/userfiles/file/67517436211.pdfIn PDF document text
    • http://www.elstar.ru/uploads/files/buzegopene.pdfIn PDF document text
    • https://ikincielinmak.com/upload/ckfinder/files/17881871873.pdfIn PDF document text
    • https://cungcapthitdetuoi.com/app/webroot/files/images/pages/files/33425290558.pdfIn PDF document text
    • http://goldia.cz/data/file/zemefiruxe.pdfIn PDF document text
    • http://laskod.hu/userfiles/file/73263673739.pdfIn PDF document text
    • http://phuvuongcorp.com/luutru/files/92079925248.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613299d1eec8b---16519767288.pdfIn PDF document text
    • http://www.rupankar.com/fckimages/file/gukafexifibugosajiduvof.pdfIn PDF document text
    • http://dekogard.net/deko/veri/_files/8895466161.pdfIn PDF document text
    • http://insureavisitor.com/userfiles/file/xafedafumakugujurapigez.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/vn4gcusdrn4a0f3aujje7d80l0/86819413530.pdfIn PDF document text
    • http://bearings-home.com/userfiles/file/zataluzezem.pdfIn PDF document text
    • http://wacommerce.net/home/integrity/public_html/ckfinder/userfiles/files/64908391062.pdfIn PDF document text
    • http://nutrizionisti.eu/public/thread/risorse/file/ridafanamotorevagowa.pdfIn PDF document text
    • http://wish-pharma.com/upload/files/5382015347.pdfIn PDF document text
    • http://remont-etalon.ru/upload/files/vevigiguxarafew.pdfIn PDF document text
    • http://eldorautomaticgates.com/UserFiles/file/34754168843.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=translate+page+ipadPDF 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_off0000bd77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD77 10412 bytes
SHA-256: 74e09cbfb10eaf00c073421c45a39df2daa21c86e1ad60be9856f8bb08321ba8
font_01_sfnt_off0000d4ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ed00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED00 15644 bytes
SHA-256: c45aff9afa744c5dc8127e6d2a38879dbc4d19021f7a991e95ea4840a8166829