Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cd8c9fd1b51a6f6…

MALICIOUS

PDF

98.1 KB Created: 2021-09-18 20:44:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: bc6ce740e88a99f5b6bba5a180a1df5a SHA-1: 29a3422309613349e4e7d1736f3f21b17f83735b SHA-256: 2cd8c9fd1b51a6f643d9daac1b4f93c93da0312844e6e7b47933505443b2d359
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for exploiting vulnerabilities or redirecting users. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of numerous external URIs, including one identified as a link farm, suggests a phishing or redirection scheme to a potentially malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 http://www.ctnphrae.com/ckfinder/userfiles/files/xewemuworopem.pdf In PDF document text
    • https://pacientes.quiroser.com/UserFilesQUI/file/siwakamijanaxutofuvik.pdfIn PDF document text
    • http://reklamaopole.pl/userfiles/file/19188031929.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/c13656f3366754e7515425599968893f/xonikitezepekufozid.pdfIn PDF document text
    • http://mskgroup-spb.ru/upload/file/90474443788.pdfIn PDF document text
    • https://value.ae/userfiles/file/kovil.pdfIn PDF document text
    • http://mawratanews.com/armedia/uploads/files/52907351226.pdfIn PDF document text
    • http://amicalelaique-guyancourt.fr/ckfinder/userfiles/files/gafitazigizepajewinela.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/sevipu.pdfIn PDF document text
    • http://defhjdr.friend-match.com/upload/files/lufonu.pdfIn PDF document text
    • http://balalajka.nu/media/56891036181.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/4583679078.pdfIn PDF document text
    • http://hueide.com/upload/files/46810205292.pdfIn PDF document text
    • http://pusheng168.com/uploadfiles/20210904072225.pdfIn PDF document text
    • http://cokhivietuc.webthoidai.com/img-vietuc/files/puguvowafitanabo.pdfIn PDF document text
    • http://tensoinox.com/userfiles/files/78474894299.pdfIn PDF document text
    • http://danangsculpture.com/uploads/image/files/wexokewokisu.pdfIn PDF document text
    • http://logistra.fr/ressource/site-image/files/50665118070.pdfIn PDF document text
    • http://satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/paguw.pdfIn PDF document text
    • http://vijyaiprismcrm.com/userfiles/files/gumenagituzavobufivezimak.pdfIn PDF document text
    • http://algarestofos.pnh.pt/js/ckfinder/userfiles/files/15794227696.pdfIn PDF document text
    • http://tongrentangthai.com/UserFiles/file/3121918315.pdfIn PDF document text
    • https://glozor.com/userfiles/file/jikepebakewuj.pdfIn PDF document text
    • http://thepnguyentran.vn/media/ftp/file/dalazawovazotujeguluka.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=restart+android+emulatorPDF 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_off00011a53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A53 18240 bytes
SHA-256: 9fd773807f1b0dedaaa1d4288d997fb74a241803ef077107d7d4d2a0f98c1af7
font_01_sfnt_off00014a44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A44 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001625b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1625B 10552 bytes
SHA-256: 8691f06b2ff68e60089fab1b3bbe306ab9795dde491712fa7c75fc5591afb026

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