Malicious PDF — malware analysis report

Static analysis result for SHA-256 71b08ff43d3679bf…

MALICIOUS

PDF

66.2 KB Created: 2021-02-17 01:12:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-04
MD5: 25e813725dc041d227484ab3ade40e16 SHA-1: b513e8dae053fd5c9e8a89690904448d39eabea7 SHA-256: 71b08ff43d3679bfd74d3ed135c2e5244ffe18e35395acc85bcb7df1891197d7
236 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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 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.
  • PHP webshell / backdoor source high WEBSHELL_PHP
    The file contains PHP server-side code with the signature of a webshell/backdoor (request input fed to a command/code-exec sink). A webshell takes attacker input from an HTTP request and runs commands/code on the server. Flagged as a malicious hacktool artifact even when carried inside a document or archive — the code does not execute from the carrier, but the file is a webshell.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://baarspo.ru/wix?keyword=watch+jersey+shore+italy+online+free PDF link annotation
    • https://varijiligedag.weebly.com/uploads/1/3/1/3/131383591/3924136.pdfIn PDF document text
    • http://nominasacra.ru/www_appshare_com_ioscw010.pdfIn PDF document text
    • https://pasorizafam.weebly.com/uploads/1/3/4/0/134096756/b2073306ee2.pdfIn PDF document text
    • https://cdn.sqhk.co/jemitaso/jida8ly/final_fantasy_tactics_advance_job_level_up_stats.pdfIn PDF document text
    • https://cdn.sqhk.co/bibunifez/R0QD0BU/9715162350.pdfIn PDF document text
    • http://reduslimitaly-ufficiale.site/dupujujorizulegaja0rh20.pdfIn PDF document text
    • https://roxomikanu.weebly.com/uploads/1/3/0/8/130873860/kewipita.pdfIn PDF document text
    • https://cdn.sqhk.co/vuwibagula/QjiXYOp/xibobujalifofa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tuxexi/40873013350.pdfIn PDF document text
    • https://s3.amazonaws.com/xalexojaxipud/php_binary_file.pdfIn PDF document text
    • https://s3.amazonaws.com/xoxaneral/us_israel_certificate_of_origin_template.pdfIn PDF document text
    • https://s3.amazonaws.com/ragejufa/capsa_susun_offline.pdfIn PDF document text
    • https://s3.amazonaws.com/xazarujokemus/http_remotelink._asus._com_for_pc.pdfIn PDF document text
    • http://xiwezolemamu.rf.gd/xokesatejejojixozoze.pdfIn 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_off0000c637.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC637 5160 bytes
SHA-256: d8e6e333544f723b9ede3f89df5ac147945d94b5ac8f1300d8c93d471cd4ca0d
font_01_sfnt_off0000d7dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7DC 10456 bytes
SHA-256: 212637530f262e2d28e891bfca73750abef260913226f4d9ef1656508753e637

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