Malicious PDF — malware analysis report

Static analysis result for SHA-256 84e0d55d373cd59d…

MALICIOUS

PDF

71.2 KB Created: 2021-03-04 17:37:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d03e6c97c1224f164129f7dc9338d4cf SHA-1: e2d478da3dc49b5fd411ff333857f8d3d9cb41e4 SHA-256: 84e0d55d373cd59d74dfb6078ead3d9383487d02ff317fc3aa5311df32449027
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 part of a link farm designed to improve search engine rankings. The primary URL suggests a lure for downloading educational materials, which is a common tactic for phishing or malware distribution. ClamAV and ML classifiers strongly indicate malicious content, likely a phishing or trojan payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://maypoin.ru/wix?keyword=toefl+ibt+official+guide+cd+free+download
    • https://cdn.sqhk.co/gukomoluda/bhcihpn/word_search_puzzles_free_printable_thanksgiving.pdf
    • https://xezefamije.weebly.com/uploads/1/3/4/3/134352880/7043520.pdf
    • http://forexgeeks.net/481986879196fibm.pdf
    • https://cdn.sqhk.co/ferudati/r2khjgj/91179061620.pdf
    • http://tuwasukam.getenjoyment.net/fixing_computer_courses.pdf
    • https://menufaron.weebly.com/uploads/1/3/0/7/130775522/rejoliguvopaxetu.pdf
    • https://cdn.sqhk.co/kobewudojuvo/bOyjdij/yellow_light_bulbs_for_screen_printing.pdf
    • https://farazekij.weebly.com/uploads/1/3/4/3/134379469/doketezadomepisinome.pdf
    • https://cdn.sqhk.co/vipabure/epiehih/55665903979.pdf
    • http://pet-guru.shop/bonebiropojirekiloki2t8rb.pdf
    • https://barijimuje.weebly.com/uploads/1/3/1/4/131406344/nimirodovavemaz.pdf
    • http://bcipreactivaperu.com/adobe_after_effect_cs6_tutorialrpyx3.pdf
    • http://yazansoft.com/rolukuvepupukemekubi3sb50.pdf
    • http://tur8osale.site/jemodokerenolosaxaxuzeleo0v3r.pdf
    • https://rezibaxuxemabu.weebly.com/uploads/1/3/1/4/131453555/5460339.pdf
    • https://cdn.sqhk.co/wanazofemuvu/fRihOhj/photo_tool_dv_lottery_max.pdf
    • http://viniveba.mywebcommunity.org/11288368531.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://77701ba7-c5ad-4750-ab17-5b03548f7fc0.filesusr.com/ugd/9a242c_4e3dbd94b1d9471f8ab07242fc389bc1.pdf?index=true
    • http://wamigorudazuz.epizy.com/fikokuzufefusuf.pdf
    • http://vidugozu.atwebpages.com/sims_3_for_mac_steam.pdf
    • https://1e1f235d-56dd-4976-b20d-d38e3fe7b172.filesusr.com/ugd/210b45_7d1d6fa9cded481480027cfaab9f8232.pdf?index=true
    • https://551f0ad2-75d1-4009-b90b-2f3e3e20230b.filesusr.com/ugd/c2bf0a_dc6455e950814953b578fceb6d5987e9.pdf?index=true
    • https://0296ecfc-28ae-4fa5-925c-67a25994cace.filesusr.com/ugd/c88839_fce2a3d549ff42a499b40685185efd86.pdf?index=true
    • https://e691ad07-92dc-45fa-af10-8929b4045ede.filesusr.com/ugd/87b9a8_eeeeea1fc6444f98aa3a4aab7ea229e9.pdf?index=true
    • http://jerananixakuzeb.epizy.com/korean_basic_language_in_nepali.pdf
    • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db26.bin
5e23be4101a64506d12e99c0b1d3b8eec5b8b30613d4595602f7f8e35f2435a4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB26 5192 bytes
font_01_sfnt_off0000ecee.bin
01762c3581b7973ac5d87141aba03277a7670b3a82e8bb803f296b27e7aedadb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECEE 10016 bytes

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