Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0a87152d052aeee…

MALICIOUS

PDF

68.4 KB Created: 2021-10-02 23:34:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 50258d8af5c30db3d921972f7ecca791 SHA-1: 90fd7f63cc5b224afc35109e1268f8a0e0972454 SHA-256: c0a87152d052aeeedc5717bcea5c8904c5f36a2b303e70cdcbc38b13bda51b65
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous external links, with many pointing to disposable domains, indicating a link farm or phishing lure. The presence of embedded URLs and the PDF structure suggest it is designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://mangalargalux.com.br/ckfinder/userfiles/files/fuvizatisaliwusumo.pdf In PDF document text
    • https://psystat.net/candyticket/uploads/page_images/files/benivevuzebazuvodewunid.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/repebutazisadabepebuwi.pdfIn PDF document text
    • https://greenboo.vn/uploads/files/70489646297.pdfIn PDF document text
    • http://rsst77.ru/upload/files/kutitobovowunavaxogorez.pdfIn PDF document text
    • http://laboratoriodiprogettazione-ve.it/userfiles/files/fitubifatenakikamopagug.pdfIn PDF document text
    • http://studiotecnicodambra.eu/userfiles/files/runibuwawebowisowade.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16154311799b8a---48412735659.pdfIn PDF document text
    • http://vinabomi.com/uploads/userfiles/file/39849869550.pdfIn PDF document text
    • http://xn--80aer5aza.xn--19-kmcm3c.xn--p1ai/ckfinder/userfiles/files/rizavebuderibo.pdfIn PDF document text
    • http://homeopathyhongkong.org/files/vifokidimejewegojodovo.pdfIn PDF document text
    • http://dungcucaytrong.com/images/files/28864490288.pdfIn PDF document text
    • http://schokoladenfontaene.de/idata/31032640044.pdfIn PDF document text
    • http://d-a-s.cn/userfiles/file/30913201791.pdfIn PDF document text
    • https://happyfun.tw/uploads/files/202109140510251733.pdfIn PDF document text
    • http://mudrkanuch.sk/editor_uploads/system/files/59313815184.pdfIn PDF document text
    • http://canadianrockies.info/files/file/durovivanoxirefabasena.pdfIn PDF document text
    • http://methese.com/upload/files/zekoxaxoxipilafodojas.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/ckfinder/userfiles/files/gakisutumoxeva.pdfIn PDF document text
    • https://theurbanthinktank.com/files/13871591595.pdfIn PDF document text
    • http://ewtch.com/upload/files/9227184883.pdfIn PDF document text
    • http://jumpinfit.it/userfiles/files/lomononarutalojo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=shakespeare+old+englishPDF 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_off0000ad5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD5A 10740 bytes
SHA-256: 380ad4b6cde067f1f1b742480adafb5ea47240330b8047a14f403ff5e2455784
font_01_sfnt_off0000c5af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5AF 15320 bytes
SHA-256: 11d01c9fe034fe34b62e4ceea6df66bcc8e2a3f9ca4696385cf8e46f4627f1c9
font_02_sfnt_off0000ec60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC60 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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