Malicious PDF — malware analysis report

Static analysis result for SHA-256 b72a0dfd0001f1b7…

MALICIOUS

PDF

87.0 KB Created: 2021-03-26 09:00:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e146187f2b162515cdeac21a235e2b61 SHA-1: b6e4edc4632438811a7984abdddc23a2c4b35541 SHA-256: b72a0dfd0001f1b7924d4dd70589641614bc16ff60a6dc1a010a5d77920a3f3c
164 Risk Score

Malware Insights

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

The PDF file contains a lure related to 'Houston police arrest records' and embeds multiple external links, one of which is identified as a potential phishing or malware distribution point. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery. The presence of embedded URLs and the 'Fake invoice / payment lure' heuristic suggest the document is designed to trick the user into clicking a link to a malicious resource.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://xezojetit.ru/wix?keyword=houston+police+arrest+records
    • http://d-youtube.com/tevuduxivurudesexigipuvjsdp.pdf
    • https://cdn-cms.f-static.net/uploads/4481510/normal_603d18a41fa46.pdf
    • http://menbp.online/how_to_dehydrate_deer_jerky_in_the_ovenvzzod.pdf
    • https://static.s123-cdn-static.com/uploads/4450723/normal_5fdf0e587dfd4.pdf
    • http://jobs-ingenieur.best/kadenazsxb3k.pdf
    • http://justiciaforjustice.com/2916254901ppzw0.pdf
    • https://cdn-cms.f-static.net/uploads/4419204/normal_600cde9b95e14.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://667b589a-70dd-4c78-a03f-47f6e9f07b1f.filesusr.com/ugd/db80c5_aaacf0312be64a54b0dc1c53f82ba226.pdf?index=true
    • https://uploads.strikinglycdn.com/files/611fa2c3-61a7-4a49-b6a5-d355e6d98859/58684925256.pdf
    • https://uploads.strikinglycdn.com/files/c3a8b057-8e6b-4165-84bb-c625f7c9fe7c/181546170.pdf
    • https://s3.amazonaws.com/baxunaf/10461751677.pdf
    • https://s3.amazonaws.com/najipavez/zezof.pdf
    • https://s3.amazonaws.com/zobuwubedak/biluwufixawowidixolujew.pdf
    • https://s3.amazonaws.com/sajatesawodiji/beautician_uniforms_suppliers.pdf
    • https://uploads.strikinglycdn.com/files/d5619b4b-c3d5-4b51-b707-c3f9c9555ca2/jisipararok.pdf
    • https://s3.amazonaws.com/dinilederu/aptana_eclipse_plugin.pdf
    • https://df9240ce-57b4-430e-a582-521170ca5232.filesusr.com/ugd/10b03a_c39482ed1a604a75ae7b257f2eac8f9a.pdf?index=true
    • https://1e438cd7-6f3b-42ac-a97b-d13a75fa135b.filesusr.com/ugd/0c268c_89e8ac50d2e5430e9fe12b2a054ee571.pdf?index=true
    • https://uploads.strikinglycdn.com/files/fd049788-1600-4a08-ac6f-c019d0c11545/dell_9010_release_date.pdf
    • https://4253c66a-660d-4c83-b31d-f715833d547b.filesusr.com/ugd/d9e9a0_e280a944c8304ec7bb766af6b47a78bc.pdf?index=true
    • https://uploads.strikinglycdn.com/files/19a7a706-43c7-4747-bcfd-4163b2fe5ffa/gabexor.pdf
    • https://uploads.strikinglycdn.com/files/8ad8f2cd-ed62-4300-9276-ca061d2048d6/how_many_calories_in_taco_bell_crispy_tacos.pdf
    • https://e9593579-f51f-4dc6-af55-2543ab512b45.filesusr.com/ugd/37952c_7b20c4d14c684a0fa5e2a7262a29217e.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011633.bin
656b4af419879aa4e907cef9291da518db16efa707ae95dc05f68746bdf2fe14		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11633 5028 bytes
font_01_sfnt_off00012757.bin
05d9c67e14c826630c622d7e7e2a98bbc5cd2dfc9422d406f94a51faefd6bb48		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12757 11420 bytes

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