Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c45eb3847a6e2a4…

MALICIOUS

PDF

85.1 KB Created: 2021-09-12 03:44:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8cd1d05ccc93f92cf4f942b218a6120c SHA-1: ac888a2bb45f1c0d43e39148a87556a9097b881c SHA-256: 2c45eb3847a6e2a4d6d7ef4e34971078d8e13a4c17d621db8f2236ce440c5f6a
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The presence of a link farm on disposable hosting, coupled with numerous external URIs, strongly suggests a phishing or malware distribution attempt. The ML classifier and ClamAV detection further confirm the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://trsoftyazilim.com/genelresimler/file/20029772365.pdf In PDF document text
    • http://www.elstar.ru/uploads/files/35836266521.pdfIn PDF document text
    • http://yilip.net/userData/board/file/28109928902.pdfIn PDF document text
    • http://chataphan.com/file_media/file_image/file/30547615412.pdfIn PDF document text
    • http://cattaneoarchitetti.it/userfiles/files/49774450287.pdfIn PDF document text
    • http://dspec-car.com/js/upload/files/votedekuleru.pdfIn PDF document text
    • http://planet-for-events.de/userfiles/file/67817907387.pdfIn PDF document text
    • http://take114.kr/FileData/ckfinder/files/20210908_BAFE19EAE9E3EE97.pdfIn PDF document text
    • https://turdv.ru/SITE/files/editor/file/gugigo.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/161335d2ed6b1a---kegitevanozusagaxujozofa.pdfIn PDF document text
    • http://robertwestlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fodojupetelilusurave.pdfIn PDF document text
    • http://ilsogno-bomboniere.com/userfiles/files/xusefenamilozurejuni.pdfIn PDF document text
    • http://meadescafe.com/userfiles/file/81714314844.pdfIn PDF document text
    • http://crmrealty360degree.in/ci/userfiles/files/talimumin.pdfIn PDF document text
    • http://autostyle-japan.com/js/upload/files/93470805781.pdfIn PDF document text
    • https://inverpalmas.com/aym_image/files/82336467601.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/xabuzapejo.pdfIn PDF document text
    • https://afgventuregroup.com/cfiles/file/tasozutozida.pdfIn PDF document text
    • http://usmleworkout.com/files/file/56299537282.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/907a03bb2fc0fe8401fe1e1f74ce5db4/lovumafakap.pdfIn PDF document text
    • https://derechosenred.org/aym_image/files/51718786515.pdfIn PDF document text
    • http://mcutech.net/files/3517472661.pdfIn PDF document text
    • https://likeevent.it/writable/public/userfiles/file/79089883379.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=how+to+change+default+storage+in+androidPDF 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_off0000e66c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE66C 10932 bytes
SHA-256: e805c7ef8803eb764271913a7bf7316e7fa77528559f39be99dbac4c62137a3d
font_01_sfnt_off0000ff88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF88 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001179a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1179A 18044 bytes
SHA-256: 7e5a67341dde119d80ed6e6c4936967f0a2185d6fa25ba02430b1298c03609c8

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