Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4283c24d3e88b5f…

MALICIOUS

PDF

80.4 KB Created: 2021-09-22 14:54:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 89c0997f6b68a6762e14823f5b169980 SHA-1: bd8a8c43237774e5628768c4eaf2f50d12dc8832 SHA-256: e4283c24d3e88b5f28839818d37da1b326aeebb675664cbb8f595b0058fba651
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URLs, with one specifically identified as a link farm designed for SEO manipulation. ClamAV and ML classifiers flagged this PDF as malicious, indicating a phishing or trojan distribution intent. The presence of embedded URLs and the structure suggest it's intended to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://krisoc.ru/uplcv?utm_term=halo+play+apk+download PDF link annotation
    • http://neteyes.eu/editor_up/64373877865.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/161396ba0e25c4---2674653680.pdfIn PDF document text
    • https://ags-car.com/upload/files/bojudesiluw.pdfIn PDF document text
    • https://alley.52886.tw/uploads/files/38484023197.pdfIn PDF document text
    • https://greenfins-thailand.org/uploads/file/1910328856.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/78797645051.pdfIn PDF document text
    • http://shbaicun.com/userfiles/file/2021090710080973499.pdfIn PDF document text
    • http://abwninemile.com/uploads/files/mulozuzopel.pdfIn PDF document text
    • http://ljjxmining.com/uploadfile/file///2021091516192913.pdfIn PDF document text
    • http://greece-ex.com/images/blog/file/24902347153.pdfIn PDF document text
    • http://peggylittlelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zuxasetikinunipalidivi.pdfIn PDF document text
    • https://cpsguffanti.com/uploads/file/80562688832.pdfIn PDF document text
    • https://triosms.com/userfiles/file/bilapomojodoxufiladoweluz.pdfIn PDF document text
    • https://soccerauquebec.com/userfiles/file/fiforofer.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/b8d944824eb1ae8ba07a500f7ae97729/93911895605.pdfIn PDF document text
    • https://mgogs.com/mgfiles/file/62797258585.pdfIn PDF document text
    • http://status-go.net/gfx/userfiles/files/57841814253.pdfIn PDF document text
    • http://hypovyhody.sk/res/file/47474261490.pdfIn PDF document text
    • http://avandcie-automation.fr/ckfinder/userfiles/files/83570840326.pdfIn PDF document text
    • http://bsl-trans.ru/admin/ckfinder/userfiles/files/36524311311.pdfIn PDF document text
    • http://esipro.lu/userfiles/file/jaxozaxez.pdfIn PDF document text
    • https://marblobaths.com/app/webroot/img/files/73066652644.pdfIn PDF document text
    • http://ceramvetro.net/userfiles/file/45569195692.pdfIn PDF document text
    • http://trans-serwis.com/userfiles/file/melorewuzedulalefawilezo.pdfIn PDF document text
    • https://mgs-on-track.com/app/webroot/userfiles/file/77223936393.pdfIn PDF document text
    • http://epmachine.ru/d/files/42826689217.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_off0000d8e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8E0 10080 bytes
SHA-256: 5191acc084c547b1b54cc30b1cc05d17a1bd33d32e722e922386e36e5427f384
font_01_sfnt_off0000ef69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF69 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001077b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1077B 17412 bytes
SHA-256: 22a965c91a392d60f461c8e684c5f0147931ee36c2c466726a7ac2a22657a264

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