Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b62debadb86fd54…

MALICIOUS

PDF

81.4 KB Created: 2021-09-10 08:03:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0f5df163c48bdc2251fb72b20c97e5b6 SHA-1: 2cdfcd58652bc7918dd1ae251801a20eb0771b57 SHA-256: 2b62debadb86fd54a964079c21f5eb94cfbd89ffc862e8ecbb053be45c0986f4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to suspicious domains and are structured as a link farm, a common tactic for distributing malware or conducting phishing campaigns. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://www.hzkontejnery.cz/ckfinder/userfiles/files/45141275835.pdf In PDF document text
    • http://xn--80aesyq.xn--p1acf/files/file/zoguwuvaremegedasogizo.pdfIn PDF document text
    • http://tinavaron.com/ckfinder/userfiles/files/tekuniwudel.pdfIn PDF document text
    • http://ducthoaudio.com/upload/files/44940098189.pdfIn PDF document text
    • https://discovercefalu.com/_data/images/file/86369906164.pdfIn PDF document text
    • http://commissioncollectionlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/15700193279.pdfIn PDF document text
    • http://africalegal.nl/userfiles/file/xonusewev.pdfIn PDF document text
    • http://xedaptap.net/userfiles/file/78103397637.pdfIn PDF document text
    • http://cesarrodarte.com/userfiles/file/venomodaredefobi.pdfIn PDF document text
    • http://markasib.ru/ckfinder/userfiles/files/55996277699.pdfIn PDF document text
    • http://neodermclinic.com/file_media/file_image/file/jazonatixowomunizozikosu.pdfIn PDF document text
    • http://hatowo.com/app/webroot/uploads/files/mefunaposunilew.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16135cc021f53e---gadikenelepoliroximelezel.pdfIn PDF document text
    • http://www.colormotion.cz/UserFiles/file/vujedolukujiwuf.pdfIn PDF document text
    • http://corkpotters.com/images/10170847473.pdfIn PDF document text
    • https://www.terraton.com.my/ckfinder/userfiles/files/1478671464.pdfIn PDF document text
    • http://c2r-auto.com/uploadfiles/file/2021090602132773499.pdfIn PDF document text
    • http://parfumerieindex.nl/images/uploads/24677087254.pdfIn PDF document text
    • http://resetimpianti.it/reset/public/file/bilozufokegedez.pdfIn PDF document text
    • http://sunpix.ru/img/lib/file/88033071296.pdfIn PDF document text
    • http://unsersohn.com/images/file/sujoxevijebovetozi.pdfIn PDF document text
    • https://piauiaqui.com/ckfinder/files/tudunogun.pdfIn PDF document text
    • http://vhktn.at/images/content/files/simawerurenerimixafamas.pdfIn PDF document text
    • http://asbu.net/uploads/FCK_files/file/taruxekujobadup.pdfIn PDF document text
    • http://seatraderhk.com/userfiles/1070492258.pdfIn PDF document text
    • http://iraneto.com/basefile/iranetocom/files/34626608522.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=amazon+fire+hd+10+2019+custom+romPDF 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_off0000d548.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD548 11300 bytes
SHA-256: 3745d66d05fdf9048348bb1669effeadb4648b76df2366568cf5e0d99df2b23a
font_01_sfnt_off0000efc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC7 18460 bytes
SHA-256: f0d63fd7c9ed9a1bca4fbefcede9f15776b41a7192e05da944d4938c145b4fc7
font_02_sfnt_off00011ff5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FF5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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