Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4d50f4e89e1f686…

MALICIOUS

PDF

77.5 KB Created: 2021-09-21 23:01:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 36e210f6df37849af95199d9628916a7 SHA-1: 358334fe6f2068abd1707c5251e55c6d27895ff6 SHA-256: a4d50f4e89e1f6869c191c66e7c67894564248296184a6fc9160ebd8a8f539e2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many of which point to disposable hosting and utilize UTM parameters, suggesting a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the nature of the embedded URLs and the heuristic firings strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://drafthe.ru/uplcv?utm_term=bendy+mod+minecraft+pe PDF link annotation
    • http://sun-apartments.pl/data/pages/wibezi.pdfIn PDF document text
    • http://cosmik-kinoteatr.ru/sadm_files/wekanomofuvuriduwox.pdfIn PDF document text
    • http://grafiport.com/userfiles/file/45854151158.pdfIn PDF document text
    • http://westpakusa.com/phpsites/vertical_living/uploads/file/4988191763.pdfIn PDF document text
    • https://livresdarts.com/ckfinder/userfiles/files/doxanopo.pdfIn PDF document text
    • http://mmprogetti.it/userfiles/files/61183230587.pdfIn PDF document text
    • https://merohamro.com/ckfinder/userfiles/files/66489111469.pdfIn PDF document text
    • http://gospelpour100voix.com/fichiers/newsletter/file/51670634935.pdfIn PDF document text
    • http://baraanduliaptti.org/userfiles/file/fijowisuzan.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/26811716310.pdfIn PDF document text
    • http://imhyuk.com/imhyukeditor/userfile/file/70577892672.pdfIn PDF document text
    • https://artofsurfing.com/preview/ckfinder/userfiles/files/51077328640.pdfIn PDF document text
    • http://canoto.us/Images_upload/files/bufuzezazemanorejiz.pdfIn PDF document text
    • http://agapetown.net/ckfinder/userfiles/files/59032215583.pdfIn PDF document text
    • http://se-ty.com/uploads/userfiles/file/70105728356.pdfIn PDF document text
    • http://miydz.com/mingyi/images/userfiles/file/vanafalusugofaba.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139b8abb3b8f---54257072961.pdfIn PDF document text
    • http://prplus4u.com/ckupload/files/xiguvinun.pdfIn PDF document text
    • http://style4.allwebeasy.com/userfiles/files/tuvavowaserifirasokoda.pdfIn PDF document text
    • https://www.barrau-philippe-sedeco.fr/ckfinder/userfiles/files/80564026790.pdfIn PDF document text
    • http://tornyanggrace.com/upload/file/xepakebiwija.pdfIn PDF document text
    • https://detector-billetes.com/Imagenes/file/lazazasek.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_off0000c3e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dbfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBFA 10736 bytes
SHA-256: 2767b52173550bd8b55fdff5b1ae5ecdcc18bd9dcbbb50f0c086cfb45006ed06
font_02_sfnt_off0000f4a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A2 19720 bytes
SHA-256: 9416ebaa5ab40e7e28e012137ced19f37d7b4dfd2788e47252a0cfc436a50a27

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