Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6472281cd9d7068…

MALICIOUS

PDF

75.2 KB Created: 2021-03-31 22:36:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e53fbe23e5ebb38ecec7b32accc3117b SHA-1: 3da9ec1bf52810087f64818f0584d3e0478767ec SHA-256: b6472281cd9d7068f6d09851312c9613f080e89bafb3864bfabacb346524a04b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious and phishing-related. It contains a large number of external links, many of which point to PDF files hosted on various domains, suggesting a link farm or redirection mechanism. The document body, though heavily obfuscated, contains metadata related to 'wkhtmltopdf' and a date, indicating it was likely generated programmatically. The presence of numerous external URIs and the overall structure strongly suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://jottigo.ru/123?utm_term=manuale+sga+millennium
    • http://rosutob.getenjoyment.net/38709563918.pdf
    • http://kitafoged.medianewsonline.com/56492225263.pdf
    • http://jonebosu.mywebcommunity.org/xivusofulemorud.pdf
    • http://bewizasosu.sportsontheweb.net/wajutexapogawabufebazaze.pdf
    • http://lamakexo.scienceontheweb.net/13733522334.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://72b50e20-f79f-40ca-96b4-24bef83e308f.filesusr.com/ugd/1a1092_b83adced64d046c3be2af166111dde8f.pdf?index=true
    • https://s3.amazonaws.com/dudurat/banana_pi_m3_ubuntu.pdf
    • https://s3.amazonaws.com/tosego/gubomuw.pdf
    • https://11e0ccb5-01dd-4757-ae93-f6f3b4f5ca32.filesusr.com/ugd/1a2ce6_e36fc2ccb51641dba689475cb25ceabc.pdf?index=true
    • https://s3.amazonaws.com/kisagoz/ccds_san_antonio_application.pdf
    • https://s3.amazonaws.com/gavapozalilup/32367713427.pdf
    • http://penanaras.myartsonline.com/segerogo.pdf
    • https://s3.amazonaws.com/nafamaragisek/cartel_and_willow_size_guide.pdf
    • http://kilarosine.atwebpages.com/sbi_atm_complaint_form.pdf
    • https://178c1879-e916-404b-9861-a2431bd0f83a.filesusr.com/ugd/1aace6_1fa4471ceb9942ccaff940818648df38.pdf?index=true
    • http://roporuti.onlinewebshop.net/31682443223.pdf
    • https://49b821e7-ee7e-41b4-809b-d0417b8c1ddf.filesusr.com/ugd/927743_c1f1ac13174442ca945d43723e28069b.pdf?index=true
    • https://s3.amazonaws.com/rujabepifar/92276333261.pdf
    • https://s3.amazonaws.com/kaxukok/jbl_charge_3_instruction_manual.pdf
    • https://f27bca7f-571c-471d-9e77-92385e6dfcd0.filesusr.com/ugd/9a0fa1_8c65da7127e942eda016f4adf151afdb.pdf?index=true
    • https://s3.amazonaws.com/jakujakula/mowixeguxodelu.pdf
    • https://eee5dff6-7331-416e-acdf-593d0c386862.filesusr.com/ugd/21e9e0_e54a73a23afd4952853acadce28ebb04.pdf?index=true
    • https://535a9070-e28a-464b-adc5-c02ad08be00b.filesusr.com/ugd/9df9d6_18a70ea711df4fb39005d018d03f0a80.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_off0000df65.bin
b7987550a53bb79abc470994ea3a6d13f27a2f49678793f466ee02b6b932005e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF65 4912 bytes
font_01_sfnt_off0000f01a.bin
d8a0ad6adf20f4593c4e5fe8274a2138953839ac25245db84adab47b5317f08f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF01A 14508 bytes

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