Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa39740d9573ca23…

MALICIOUS

PDF

86.6 KB Created: 2021-02-20 03:46:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 9caa01ad4315576ce247a07443374008 SHA-1: 7896207727a1e2437c8c967b1b91bdbd0b3d4327 SHA-256: aa39740d9573ca23ead5fc71d546c792f56db61d4d871d9a803937e9b87c1984
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a technique often used for SEO spam or phishing. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic suggest the document is designed to redirect users to malicious websites, potentially for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 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.
  • 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/123?utm_term=is+samsung+8k+tv+worth+it PDF link annotation
    • https://tiseworadew.weebly.com/uploads/1/3/5/3/135317060/texiranit_dudupofuwa_xexivitobedunut.pdfIn PDF document text
    • https://moxuwurenawa.weebly.com/uploads/1/3/0/8/130874588/666a07.pdfIn PDF document text
    • http://beststudent.space/home_assistant_integration_mqtt_discoveryvjsb4.pdfIn PDF document text
    • http://fsfsfd.xyz/information_fusion_centre_reporting4s1a0.pdfIn PDF document text
    • http://natlab.ru/manualidades_con_papel_periodico_canastas_paso_a_paso9nwa4.pdfIn PDF document text
    • https://sujoxiwu.weebly.com/uploads/1/3/4/8/134879933/57ca1670ff.pdfIn PDF document text
    • https://tenasedoba.weebly.com/uploads/1/3/4/3/134333827/cd2dfd5d.pdfIn PDF document text
    • http://mediaverifiedbadge.com/crystal_reports_9_fullhcrek.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/vezumobigodub/ato_weekly_tax_tables_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/pegek/badubujowumasaki.pdfIn PDF document text
    • https://s3.amazonaws.com/fadadedezeker/glue_for_flexible_pvc_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/wukara/list_of_abbreviations_and_acronyms.pdfIn PDF document text
    • https://s3.amazonaws.com/libusamagowuvo/22473035886.pdfIn PDF document text
    • https://s3.amazonaws.com/liluvad/foreign_gospel_worship_music.pdfIn PDF document text
    • https://s3.amazonaws.com/bezorito/ff14_garuda_ex_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/vapite/konegorosagim.pdfIn PDF document text
    • https://s3.amazonaws.com/geraromu/80316955511.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxime/sevidozonovixixipujuw.pdfIn PDF document text
    • https://s3.amazonaws.com/bagisi/rowopinonetolijal.pdfIn PDF document text
    • https://s3.amazonaws.com/vukumesoj/46974518377.pdfIn PDF document text
    • https://s3.amazonaws.com/getizar/vojof.pdfIn PDF document text
    • https://s3.amazonaws.com/pilazi/levajulitoripone.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000105da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105DA 5180 bytes
SHA-256: 600cd752935eaf4d7e26cf0cb547e5dc95ec4133b0d60f95be5376b748088898
font_01_sfnt_off0001174e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1174E 11544 bytes
SHA-256: 53cc93cf2ae998d9bb1fbfaf2c528919edc621eb0eb40abd5c7f335776ae1fef
font_02_sfnt_off00013eae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EAE 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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