Malicious PDF — malware analysis report

Static analysis result for SHA-256 306e10e54d97045e…

MALICIOUS

PDF

81.0 KB Created: 2021-09-23 05:57:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 12afa964fa3f96fe0aa2c0247b6aee32 SHA-1: 3305ebb0d01b6cfaa72589902964feb46e5aaf17 SHA-256: 306e10e54d97045ef7ef48752667b724a5b47915d291b9e707d80c14249eb031
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically indicating phishing and trojan activity. It functions as a link farm with numerous external URLs, many pointing to unknown or potentially disposable domains, increasing the likelihood of directing users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a tactic to obscure malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://fd-health.com/upload/ckeditor/files/62729278259.pdf In PDF document text
    • http://stolizstekla.ru/userfiles/file/lodopuzakewojap.pdfIn PDF document text
    • https://mimpishio2bet.net/contents/files/86557089740.pdfIn PDF document text
    • https://debo-fit.be/userfiles/file///864083074.pdfIn PDF document text
    • https://lotusmarinevn.com/upload/files/28734376699.pdfIn PDF document text
    • http://ibrahimabuomira.com/ckeditor/ckfinder/userfiles/files/30617848998.pdfIn PDF document text
    • http://www.mustwalge.ee/data/content/files/ponuz.pdfIn PDF document text
    • http://nujhimachal.in/img/uploads/files/27244419817.pdfIn PDF document text
    • http://wish-pharma.com/upload/files/popurokasawimufibapebud.pdfIn PDF document text
    • http://zetrade.cz/userfiles/file/xapamuxitit.pdfIn PDF document text
    • http://goang-hann.com/uploads/files/202109141731378256.pdfIn PDF document text
    • https://cuatudongsaigon.net/uploads/files/lurufutefe.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161350decccf02---bidivevodowamob.pdfIn PDF document text
    • http://educasters.co/ckfinder/userfiles/files/gedimidon.pdfIn PDF document text
    • http://catherine-massage.com/ckfinder/userfiles/files/mibizojowokajunevogoram.pdfIn PDF document text
    • http://osayit.com/images/file/fujimunakupejapalezo.pdfIn PDF document text
    • http://www.greenfield-sustainability.com/images/files/depidifafimalonoraju.pdfIn PDF document text
    • http://encino.ilovepokebar.com/uploads/files/82215841155.pdfIn PDF document text
    • https://lochoanggia.com/upload/files/newatusaxox.pdfIn PDF document text
    • http://fujiya-la.com/uploads/files/gabiwisamivi.pdfIn PDF document text
    • http://malerbetrieb-malanders.de/Webseite/pics/fotos/1/file/jerijekitudebokuwajagile.pdfIn PDF document text
    • https://ita.kru.ac.th/ckfinder/userfiles/files/514693796.pdfIn PDF document text
    • http://murielbellhomes.com/userfiles/files/18195399728.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=kung+fu+history+philosophy+and+technique+pdfPDF 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_off0000cbe7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBE7 21728 bytes
SHA-256: 4fd18f1281332c1d113884fcc4be84284fc8bae15298a5813ac666e8d34b2aed
font_01_sfnt_off000103d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011bea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BEA 11248 bytes
SHA-256: 9df0ce4139f885eba8f438a2f901bcfc751a78076eabeb967d8c92dca6ea7fbf

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