Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8ab8b1500f4e71f…

MALICIOUS

PDF

69.3 KB Created: 2021-10-04 08:10:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 295388869147a98c0d323988f870f705 SHA-1: 9cb6c7b1df6e8893c0b46b489e259d8b4cb97c40 SHA-256: d8ab8b1500f4e71ff60b09520917b4d7bd95292b69e08c19756bf2fbcc6775da
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. It contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The document body is heavily obfuscated and unreadable, but the presence of external links and the overall heuristic profile strongly indicate a malicious intent to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://huntic.ru/uplcv?utm_term=brothers+grimm+hansel+and+gretel+pdf PDF link annotation
    • https://mr-alian.com/upload/ckfinder/files/32265435168.pdfIn PDF document text
    • http://www.casasemio.com.br/ckfinder/userfiles/files/9253320320.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161347f91cbf1e---2062392969.pdfIn PDF document text
    • https://il-gusto.com/images/file/kuvuvetorow.pdfIn PDF document text
    • https://i-intelli.com/ckfinder/userfiles/files/53640982933.pdfIn PDF document text
    • https://yaslibakicisi.net/userfiles/file/pikapowewomaguvodonob.pdfIn PDF document text
    • https://poganyvolgyi.hu/userfiles/file/pivej.pdfIn PDF document text
    • https://cheesykeju.com/contents/files/zixujuxefuga.pdfIn PDF document text
    • http://westernstudioservice.com/admin/userfiles/file/worolibusupomejuboramize.pdfIn PDF document text
    • http://progettocecinacuore.it/writable/public/userfiles/file/62438930109.pdfIn PDF document text
    • http://deshdunya.com/blogimage/file/nubokokopimumurojonudi.pdfIn PDF document text
    • http://sola-brothers.com/userfiles/file/dogowekejazaxogigumazi.pdfIn PDF document text
    • http://nieruchomosciklodzko.pl/files/file/nanexegufitenirexanaduze.pdfIn PDF document text
    • http://mu-rrrc.com/userfiles/file/10425703414.pdfIn PDF document text
    • http://chuabenhxuongkhop24h.com/images/files/runimimubetiwoziluvipik.pdfIn PDF document text
    • https://triangle-electronics.com/assets/userfiles/file/62261292883.pdfIn PDF document text
    • https://aymsoft.us/aym_image/files/xananufamakuwekerabew.pdfIn PDF document text
    • http://goodtraefarm.com/ckupload/files/17754271465.pdfIn PDF document text
    • https://tenderdiary.com/ckfinder/userfiles/files/75771464196.pdfIn PDF document text
    • https://iringmalaysia.com/ckfinder/userfiles/files/maset.pdfIn PDF document text
    • http://studiotecnicomartani.eu/userfiles/files/werokokaxupaxutaw.pdfIn PDF document text
    • http://selfmadefilms.nl/userfiles/files/modixarebu.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/b62a6e2d168069423689e2b964d5058a/kobikakodanuriwagogek.pdfIn PDF document text
    • http://terfigyelokamera.info/files/file/94566374111.pdfIn PDF document text
    • http://cobe-ing.it/userfiles/files/kilufu.pdfIn PDF document text
    • https://mollis.rs/files/nanunino.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_off0000b26e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB26E 14400 bytes
SHA-256: e50f8d1e2fbfb0f4a603b85b9242728f0609b47d8a2299f20cf73325318c3f62
font_01_sfnt_off0000d664.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD664 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ee7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE7B 11000 bytes
SHA-256: fd7b73e49c23ac5cb8b40afb0833db1377b44364e6254e753cb6963b2977253f