Malicious PDF — malware analysis report

Static analysis result for SHA-256 df766ad251f531f7…

MALICIOUS

PDF

74.5 KB Created: 2021-04-07 21:05:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: ca9064364f317dd8dfb24e85037d53fc SHA-1: 825c3a4271a982429f79617ee7c44bfe71152541 SHA-256: df766ad251f531f7e71618757c5ca4acdd6872e8755d14318bd941b1c8f47ad8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 https://mezovuduw.ru/aws?utm_term=what+is+standard+operating+procedures+in+school PDF link annotation
    • http://pilinopumewaza.mywebcommunity.org/xuzotudekapedupop.pdfIn PDF document text
    • http://digtalcaliper09.xyz/theories_of_communication_networkspfojs.pdfIn PDF document text
    • http://vinnipoh.fun/android_cardview_background_color_gradientkq36i.pdfIn PDF document text
    • http://gidujepeparu.22web.org/resumen_del_libro_el_guardian_entre_el_centeno_personajes.pdfIn PDF document text
    • http://crystal-light33.ru/chattanooga_hydrocollator_service_manual1wtmt.pdfIn PDF document text
    • https://cdn.sqhk.co/sevijeruba/hjhIMgd/74162311475.pdfIn PDF document text
    • http://lomags.ru/bifuxosajijurasadoxeseru4rjca.pdfIn PDF document text
    • https://cdn.sqhk.co/wufotubi/iie4hc8/most_popular_music_2020_clean.pdfIn PDF document text
    • http://afracheat5.xyz/58552680782h706.pdfIn PDF document text
    • http://prostotit.site/buboz6ckjb.pdfIn PDF document text
    • http://xekaleduwam.iblogger.org/american_airlines_brand_guidelines.pdfIn PDF document text
    • http://bezprovodov.guru/which_of_the_following_statements_is_true_regarding_managerial_accounting_informationozd0c.pdfIn PDF document text
    • https://cdn.sqhk.co/pexevoxe/bihy7Ps/64034896868.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://danebusuji.onlinewebshop.net/gajiwelowidojoronipapa.pdfIn PDF document text
    • http://pikawin.rf.gd/xafozawusijuxox.pdfIn PDF document text
    • http://pebomotixot.myartsonline.com/6408072751.pdfIn PDF document text
    • http://vexabimumemig.atwebpages.com/asp.net_mvc_list_from_view_to_controller.pdfIn PDF document text
    • http://dijimati.rf.gd/31240225675.pdfIn PDF document text
    • https://574dee49-ee40-4737-ae02-340ce2b26f9d.filesusr.com/ugd/b44cf7_3adfbea7b97d4172aae6105bc2baa4eb.pdf?index=trueIn PDF document text
    • https://45e41439-46a4-4c97-84f0-155cfeda4cef.filesusr.com/ugd/9d7ad9_6222be61a59f4269ac7ba433384becf9.pdf?index=trueIn PDF document text
    • https://1d942ef5-affb-47d8-8f99-70a3d187b733.filesusr.com/ugd/3283b0_24508488b8a24eda81a9887c57a57ebf.pdf?index=trueIn PDF document text
    • 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6B3 5348 bytes
SHA-256: da45535b98bd5bbd0f21609fd0c60b9a1d904f527abdf104143d98cad5de41b5
font_01_sfnt_off0000f8ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8EA 10356 bytes
SHA-256: 84e03ee099fd2dafb3b4108a698d7b0937e7933ce7ca2ce52646152bcabd6e69

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