Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4d4f4b620f522bb…

MALICIOUS

PDF

113.0 KB Created: 2021-03-09 02:53:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0c1dfff0146ba0e8ab98324e7a138108 SHA-1: af1263f2dd44dcd84f39a858a5850c8900773a52 SHA-256: b4d4f4b620f522bba39a72b83214543fd945be28a4beef6ebea76400fd2b61fb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous external links, many of which are associated with SEO link farms, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded links are indicative of a lure to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jumiwimov.ru/award?keyword=apache+tomcat+tutorial+pdf
    • https://cdn.sqhk.co/zejovedelali/bhcWjjm/72502433785.pdf
    • https://cdn.sqhk.co/raxuzuvuluf/YSgeidd/hill_climb_racing_2_hack_online.pdf
    • http://rirenanevigi.22web.org/30540055657.pdf
    • https://cdn.sqhk.co/bugolajoxodu/zcvGkjf/axis_line_color_matplotlib.pdf
    • https://cdn.sqhk.co/litonesi/gg4hjhj/29214089317.pdf
    • http://tuzogat.sportsontheweb.net/42403615267.pdf
    • https://cdn.sqhk.co/mekaxosur/hmgdkji/all_mobile_recharge_app.pdf
    • https://cdn.sqhk.co/madilaxetevo/awebjcG/download_growtopia_mod_apk_2._994.pdf
    • https://cdn.sqhk.co/gopuxipo/fjaoifC/wurivepepegivanake.pdf
    • http://bupimobim.sportsontheweb.net/concept_of_curriculum_development.pdf
    • https://cdn.sqhk.co/melipetoluf/2Igengf/70925120031.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://givetupazowo.onlinewebshop.net/56689490658.pdf
    • https://64e18f06-8a0e-4dc1-8427-9dd81b4bff36.filesusr.com/ugd/baa514_c6c33219d5ef44c49265926f7237bc43.pdf?index=true
    • https://94226b1b-8363-4ad6-a779-e61b7b16ff5b.filesusr.com/ugd/b3bc21_8f1599093f2945e29d64e0847bb27141.pdf?index=true
    • http://renenuxasopiw.epizy.com/29041891305.pdf
    • https://ec679cc6-872a-45a8-b2fd-b1bc8f6ddb77.filesusr.com/ugd/d1d005_6b223161c4e7464793f37c5d8a62bf9c.pdf?index=true
    • https://5e9816b5-e261-4a84-a5c7-594b6999e1c8.filesusr.com/ugd/eb2f7d_0b03a5447aa74171bf2e09e562e77960.pdf?index=true
    • http://bujijawuta.atwebpages.com/26185947788.pdf
    • http://zitasixan.atwebpages.com/guvutepuwupolosumo.pdf
    • http://zegaruso.rf.gd/bofixe.pdf
    • http://pivutabonapo.rf.gd/who_are_the_main_characters_in_the_cask_of_amontillado.pdf
    • https://47e244ab-6b1f-4ae7-97e8-86de5b619f9f.filesusr.com/ugd/e1d12c_804a424e8ddd4607b80b1efe64b1ef7e.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000169bc.bin
f9129d2e9a4e93e837d6b8b48b13c14ff283e2040b5432fe8549dce94bf0b163		 pdf-font-stream PDF embedded font (sfnt) at offset 0x169BC 5204 bytes
font_01_sfnt_off00017b3c.bin
e9a5a1f6ed95b1e3669933bb00002ad32a1708c3e0b735191cad5e02368a6c7d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17B3C 1800 bytes
font_02_sfnt_off000183ca.bin
ef120847c01f8c72703d2c202934ff830d421a228683f04ee24b140b76b12d9a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x183CA 16288 bytes

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