Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f8acbe7f8f37604…

MALICIOUS

PDF

69.6 KB Created: 2021-04-23 22:44:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4f5920ac11d224d81d5b10a56617da3c SHA-1: 39880cddb2752bf4bd99b67079bcbae2567bcb1d SHA-256: 7f8acbe7f8f376043688784471efab412710134debe2a311ecf168be751f303e
124 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable domains and are likely used for phishing or to host malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm strategy, and the ML classifier and ClamAV detection confirm malicious intent. While no scripts were explicitly extracted, the presence of external URIs and the overall structure suggest an attempt to redirect the user to malicious sites, potentially for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8596

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • 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://druttle.ru/strik?utm_term=resumen+del+libro+el+diario+de+greg+2+la+ley+de+rodrick
    • http://titanof-filtr.ru/best_heavy_duty_singer_4423_sewing_machinevqfi3.pdf
    • http://winnerslm.space/4577998228638sw7.pdf
    • https://cdn-cms.f-static.net/uploads/4393034/normal_60324d8b58981.pdf
    • http://hotsales-com.xyz/street_fighter_4_ultra_combo_doublepwoel.pdf
    • http://my-credit.info/xirirejujuvawatisizakw5sg3.pdf
    • https://cdn-cms.f-static.net/uploads/4496148/normal_604510e772fd8.pdf
    • https://zunenevalomedo.weebly.com/uploads/1/3/4/8/134855990/sedimegetojodox.pdf
    • https://wededizopi.weebly.com/uploads/1/3/3/9/133986349/gebomusoketoroxotof.pdf
    • http://kvyovk.xyz/11829628591de715.pdf
    • http://ro-shop.space/arteriovenous_malformation_surgery_optionsux1sd.pdf
    • http://revershjtb.site/ley_general_de_titulos_y_operaciones_de_credito_que_esedovu.pdf
    • http://tokio-2020.fun/wosomop93f81.pdf
    • https://zobujonewuw.weebly.com/uploads/1/3/5/3/135389851/dff279ef3038f5.pdf
    • http://defi-bet.world/does_sketchup_free_work_on_ipads2rop.pdf
    • http://giocodigital.space/seven_years_old_lyrics_remixmavn8.pdf
    • https://nererudufujodu.weebly.com/uploads/1/3/4/3/134321338/3522170.pdf
    • http://lalashoppen.online/2116343627202bqh.pdf
    • https://fafenerukore.weebly.com/uploads/1/3/1/3/131398145/rutomisijo.pdf
    • http://mxbur.fun/fiperagud4zcnr.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/wujixus/valkyrie_profile_psp_rom.pdf
    • https://s3.amazonaws.com/fonibinaraj/beginning_and_ending_consonant_blends_worksheets.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e576.bin
cccbe447a8c8e3a1d27e9cf7defbf13e569b3392b234d1b3ee88b5e96cbbadf8
pdf-font-stream PDF embedded font (sfnt) at offset 0xE576 5508 bytes
font_01_sfnt_off0000f80e.bin
3b94c59fb9ad98410fca6fb051b722833de2cec00d7d5ce5d2e2f0867763b9b5
pdf-font-stream PDF embedded font (sfnt) at offset 0xF80E 11440 bytes