Malicious PDF — malware analysis report

Static analysis result for SHA-256 19e4e590dfd7b559…

MALICIOUS

PDF

76.6 KB Created: 2021-09-17 11:32:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0e284d0b4c41254c9d1493a141734a8c SHA-1: a13d153a09776bc7259f71684b21d69c38d0fdce SHA-256: 19e4e590dfd7b559a09b5f4c16d15527122cc7aac8f5c4e0c4370effe86e171f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests the document is a link farm designed to redirect users to multiple distinct, potentially malicious, domains. While no scripts were extracted, the embedded URLs point to numerous unknown domains, supporting the phishing or malware distribution attack pattern.

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 https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/16934519521.pdf In PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/52164729158.pdfIn PDF document text
    • http://sarica.com.tr/ckfinder/userfiles/files/31076455469.pdfIn PDF document text
    • http://www.premiumimport.nl/ckfinder/userfiles/files/reranog.pdfIn PDF document text
    • https://oddluzanie.net/userfiles/file/84581920877.pdfIn PDF document text
    • https://epponline.com/mentorfinancial/page_images/file/ziwutokejalurapafubik.pdfIn PDF document text
    • http://france-ex.com/images/blog/file/jokelevir.pdfIn PDF document text
    • https://pottoka.info/files/galeria/files/9815428272.pdfIn PDF document text
    • http://awarelaxcentrum.cz/user_files/file/93159552800.pdfIn PDF document text
    • https://footballsod.com/images/ck-uploads/files/ziwitu.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16137ab000449c---72746880855.pdfIn PDF document text
    • http://georgewongdesign.com/gwd/upload/files/21429390418.pdfIn PDF document text
    • http://moyamoya.center/images/hand_uploaded/files/gizitu.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/sagasavoluruze.pdfIn PDF document text
    • http://stroytehcentr.ru/images/file/13820154136.pdfIn PDF document text
    • https://guapa2.com/admin/fck/file/xaxakufa.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/qo9bm38blol3udf57ppku2iu8e/79091906158.pdfIn PDF document text
    • http://thietbibepnhahang.net/media/files/liwobivasozega.pdfIn PDF document text
    • http://qdjshg.com/files/file/balikikesedamavatoxu.pdfIn PDF document text
    • https://pianotuningdarwin.com/userfiles/files/92294653077.pdfIn PDF document text
    • http://newkontakt.ru/userfiles/images/file/ronifaxexotozaloradek.pdfIn PDF document text
    • http://villkasz.hu/editor_up/tosanilufafepinif.pdfIn PDF document text
    • http://sorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/86106427034.pdfIn PDF document text
    • http://studiogaleazzo.eu/userfiles/files/xaxokedujasinexeb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=structure+of+dicot+and+monocot+seedPDF 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_off0000c819.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC819 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e030.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE030 10768 bytes
SHA-256: 33dde8814aa4f9ba75100f5d3084acf1f84a7d0c7896924bde66f42c9d72c2d9
font_02_sfnt_off0000f8f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F1 16908 bytes
SHA-256: b357fec460a08a4aca2ef57ec5bb5a7163fca5bd61366876fa078594212eae4e