Malicious PDF — malware analysis report

Static analysis result for SHA-256 36f4c47df7fc9fe7…

MALICIOUS

PDF

130.1 KB Created: 2021-04-02 19:08:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: f11da37dd9a51584dd2b45d585a72ed8 SHA-1: d757be647a4fc984212dd01727c2a7d6ed0fd001 SHA-256: 36f4c47df7fc9fe746fc33744201e49f7ccb9a999ade2d41ac7aabaaeeb18594
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, suggesting an attempt to manipulate search results or redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the presence of numerous external URLs points to a downloader or redirector pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://seumenha.ru/award?keyword=certified+ethical+hacker+study+guide+v10+pdf PDF link annotation
    • https://cdn.sqhk.co/tixukiko/aW74Sab/46021841603.pdfIn PDF document text
    • http://wumiwuzigimo.mywebcommunity.org/67271136799.pdfIn PDF document text
    • https://cdn.sqhk.co/pibepufas/fTFRgfy/80845920606.pdfIn PDF document text
    • http://nijepatexosanus.medianewsonline.com/nolamodagixigodeguki.pdfIn PDF document text
    • http://bewudewumit.sportsontheweb.net/formulas_in_excel_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/zowesifona/jheqhhd/7016129483.pdfIn PDF document text
    • https://cdn.sqhk.co/gobajejuz/WxhgjeG/5534079476.pdfIn PDF document text
    • http://vasakuso.sportsontheweb.net/72104400716.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/sisaxu/craftsman_10_inch_direct_drive_band_saw_parts.pdfIn PDF document text
    • https://s3.amazonaws.com/dapekufoxiraku/android_studio_online_version.pdfIn PDF document text
    • https://6d4a8fb0-9a8a-4850-8aa1-2b5706121c9a.filesusr.com/ugd/ff2e72_558b20c12bc34b08b5d3dc26d83c33af.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fukepez/kreepy_krauly_legend_troubleshooting.pdfIn PDF document text
    • https://s3.amazonaws.com/mokuwanibof/business_budget_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/zodawanuror/audio_editor_cut_merge_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/netinuwa/remittance_advice_email_template.pdfIn PDF document text
    • https://s3.amazonaws.com/dapekufoxiraku/lamodufigepuvijenujed.pdfIn PDF document text
    • https://s3.amazonaws.com/sowirutelevolur/227411488.pdfIn PDF document text
    • https://s3.amazonaws.com/niwotipugonuvoz/28830756838.pdfIn PDF document text
    • https://s3.amazonaws.com/lewuli/kilozotokosibidulew.pdfIn PDF document text
    • https://s3.amazonaws.com/sefiwegegagu/ragnarok_mobile_leveling_guide_hunter.pdfIn PDF document text
    • https://s3.amazonaws.com/lomogas/how_to_know_if_carbon_monoxide_alarm_is_going_off.pdfIn PDF document text
    • https://s3.amazonaws.com/tarajix/duratrek_pocket_style_fender_flares_install.pdfIn PDF document text
    • https://26f2e344-8444-46ea-90c9-5a893bcc2fb3.filesusr.com/ugd/b8c837_c52312d9af1f44999696581b5ade07fb.pdf?index=trueIn PDF document text
    • https://314a97e4-cc7b-499c-a999-42b15fb65c39.filesusr.com/ugd/fa4a73_45bad552886741c8b1f1f16e425d3db2.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A3 67440 bytes
SHA-256: 9e58c2c383a3c7b0da97d938f569adee7191904259646c681e9bc7a917535613
font_01_sfnt_off0001be75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BE75 5744 bytes
SHA-256: 273bf528d658f7d667080951074b4be71f830930e8b45eec83979c1751ce0efb
font_02_sfnt_off0001d20e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D20E 10848 bytes
SHA-256: ff782c8b8e9611b611458d6b157c8ffbb9c2ecfce848d363edc6b171ad2abcf7

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