Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0caaae86dbd3dd2…

MALICIOUS

PDF

80.7 KB Created: 2021-09-12 17:26:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8796b9cc2e4cfe82f176b3ac7a173311 SHA-1: ef3e5ce67f248567ae29b6d37d6f69a71e788684 SHA-256: c0caaae86dbd3dd20b05586653b33d931e03d7a2a55ef6dd705b37aaf480caa8
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://visualmotion.nl/uploads/file/69937163291.pdf In PDF document text
    • http://hoya-system.com/uploads/files/202109070059038724.pdfIn PDF document text
    • https://leganordavigliana.it/uploads/file/ragixekogumijeja.pdfIn PDF document text
    • http://geometracosentino.com/userfiles/files/23334516028.pdfIn PDF document text
    • http://importfoodfair.com/userfiles/image/2021/09/file/zisiw.pdfIn PDF document text
    • https://khoahoc.timviec365.com/picturesfiles/lorofuwam.pdfIn PDF document text
    • http://fst-uinsu.net/userfiles/files/16070750637.pdfIn PDF document text
    • https://www.comperat-89.fr/ckfinder/userfiles/files/wufenedowitinev.pdfIn PDF document text
    • https://elsadaulte.com/ckfinder/userfiles/files/92083312560.pdfIn PDF document text
    • http://tbeaindia.com/userfiles/file/65003760465.pdfIn PDF document text
    • http://satthachkhe.vn/image/file/karamip.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/e1cfdb7422f7dfda079251b3419ca9d3/xopojeredatitazix.pdfIn PDF document text
    • http://apartamentykunickiego.pl/architekci/public/upload/ckfinder/userfiles/files/14901387839.pdfIn PDF document text
    • http://atomleasing.ru/media/File/6221777344.pdfIn PDF document text
    • http://modero.vn/upload/files/suwowazuludopamane.pdfIn PDF document text
    • https://ikuseikyokai.jp/ckmedia/files/zulizawukamuz.pdfIn PDF document text
    • http://sjmhospital.org/files/js/ckfinder/userfiles/files/rimitegosixulovexa.pdfIn PDF document text
    • https://derya.afmiletisimajansi.info/resimler/files/91670935706.pdfIn PDF document text
    • http://vertex-decor.com/userfiles/file/6536865580.pdfIn PDF document text
    • http://lotusburbank.com/uploads/files/dokajanon.pdfIn PDF document text
    • http://marketingnews.fr/images/file/78493347800.pdfIn PDF document text
    • http://timeyear-v.com/userfiles/file/jakiwozilevimo.pdfIn PDF document text
    • http://xiangzhuan.tw/upload/files/16407882909.pdfIn PDF document text
    • http://georgekoldun.com/var/upload/file/12875711560.pdfIn PDF document text
    • http://eapver.com/upload/ckimg/files/202109080935203990.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a7017959fd---kujazupuduwowujeranawogo.pdfIn PDF document text
    • http://dietaltop.com/userfiles/files/4592018444.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=2d+home+planPDF 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_off0000dc5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC5A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f46c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF46C 16324 bytes
SHA-256: 510d95fcfecda4cfaa66bd8bc0a00853d5b6d41eb2a55e42ed5a749abc6d3f91
font_02_sfnt_off00011e5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E5F 10224 bytes
SHA-256: 617b0d0e82f1d79a37f529ed2708f255d2e281a41ae538ff41bc577148a5dc3e