Malicious PDF — malware analysis report

Static analysis result for SHA-256 13f49a06d446ab98…

MALICIOUS

PDF

73.5 KB Created: 2021-02-17 16:38:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 604c6ed1b4507b97e4b3f1d404732a09 SHA-1: 6547e39fb81a94f857890ca559dda27b0a3c331e SHA-256: 13f49a06d446ab9890c7fa8a8dc4bf011abb6fb32a62492090c6181152cc1bf9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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=ashton+meem+instagram PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4389823/normal_5fce626c375f0.pdfIn PDF document text
    • http://nature-ital.space/dual_fuel_inverter_generator_for_rva5efp.pdfIn PDF document text
    • http://clyb-wylcan3.space/91891925603jvjhr.pdfIn PDF document text
    • http://claire-irk.ru/8710001567nlxxh.pdfIn PDF document text
    • http://hh666o.site/sojewidalivirofuki08zpa.pdfIn PDF document text
    • http://jufobimagif.iblogger.org/elevadores_cangilones.pdfIn PDF document text
    • http://xasebilebefetut.iblogger.org/shiva_angry_hd_image.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/feseni/frankfurt_eating_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/xuxifuzituwu/chemical_equilibrium_and_thermodynamics_lab_report.pdfIn PDF document text
    • http://muxobuduxude.epizy.com/email_format_check_in_android.pdfIn PDF document text
    • http://wavupix.epizy.com/can_we_kiss_forever_ringtone.pdfIn PDF document text
    • http://negavutagogo.epizy.com/617261668.pdfIn PDF document text
    • https://s3.amazonaws.com/sulasatevirexo/whatsapp_apk_for_pc_windows_7.pdfIn PDF document text
    • http://zifawikixeliba.epizy.com/43346069273.pdfIn PDF document text
    • https://s3.amazonaws.com/dusined/dances_with_wolves_sheet_music_violin.pdfIn PDF document text
    • http://disemetizoxexo.rf.gd/vasufuxedokuxim.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_off0000e187.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE187 5056 bytes
SHA-256: 8b75a4dfd90946aad1a1a9950bd6f10569574eda37ec1fa6c9a00c192fcdb629
font_01_sfnt_off0000f290.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF290 11552 bytes
SHA-256: c31e37d6a91da78cdf81f0e9231fa9f1e4aafb2dced9efe4d597c3310d7736c4