Malicious PDF — malware analysis report

Static analysis result for SHA-256 7331462f32d8aa2d…

MALICIOUS

PDF

69.7 KB Created: 2021-09-26 13:14:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 806cda6b3f37788ebeb86bdafe069bb7 SHA-1: aca3c2af6f72f53d81e85ff84c8838b76c5563d0 SHA-256: 7331462f32d8aa2d1b02804e807e5c7658aedcda1226708a3e9402b929b33bba
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://liyangah.com/Upload/file/dirijenogafoguwa.pdf In PDF document text
    • http://fishngrill.iorderfoods.com/uploads/files/pibusono.pdfIn PDF document text
    • http://gartenbaukoeln.de/uploads/files/butabadatuxedonobo.pdfIn PDF document text
    • http://perfect-gallery.com/userfiles/file/17878276655.pdfIn PDF document text
    • https://baigiangtoanhoc.com/upload/files/vidosojulusi.pdfIn PDF document text
    • http://auto-rad.pl/userfiles/file/21273338217.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/v6i09e3jd3mjscqdjtkl7mq8ia/nuvizeparesojuworus.pdfIn PDF document text
    • http://sungwoneng.com/upfile_editor/2021/files/92755025384.pdfIn PDF document text
    • http://chiari-web.com/ckfinder/optimist/files/ligewefuwokixuteduneposo.pdfIn PDF document text
    • http://abwcolley.com/uploads/files/xovajulewigelejodol.pdfIn PDF document text
    • http://metamorfoza-krosno.pl/userfiles/file/pideminarofafununona.pdfIn PDF document text
    • https://greenvalleykerala.com/ckfinder/userfiles/files/nurejugipiz.pdfIn PDF document text
    • https://tatvan.in/userfiles/file/17056399713.pdfIn PDF document text
    • http://red-persimmons.com/upfiles/editor/files/71128660240.pdfIn PDF document text
    • https://pro-biomed.com/admin/userfiles/file/nukiroronasukalujajeb.pdfIn PDF document text
    • https://songhong.info/userfiles/file/59225226425.pdfIn PDF document text
    • https://guptajimarriagebureau.com/userfiles/file/kafejokezigobenus.pdfIn PDF document text
    • http://uralteplostroy.ru/content/file/lelosimirefidubeligazapiz.pdfIn PDF document text
    • https://ww150002.linebot.net/upfile/files/20210920010935.pdfIn PDF document text
    • https://www.privathospitaletkollund.com/ckfinder/userfiles/files/visepanonorazanonifuwuvuf.pdfIn PDF document text
    • https://ncvpte.in/userfiles/file/wituvokupusozuzedop.pdfIn PDF document text
    • http://tataservice.it/userfiles/file/91092206815.pdfIn PDF document text
    • http://synowka.pl/galeria/file/bapololotelajorikefa.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/lisezuxizadozenikukowuwuw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=gta+4+super+punch+cheatPDF 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_off0000b2e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2E2 10432 bytes
SHA-256: 682f0f868495bec822614f3c98f829bf4f1676059792a759b4de272511086d43
font_01_sfnt_off0000ca8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA8C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e29e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE29E 15304 bytes
SHA-256: 7e6223815ddf76daa32013dc238594cfe326a775aaa8ec7622470c86889017de

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