Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b45f8b6fe04781e…

MALICIOUS

PDF

66.6 KB Created: 2021-03-04 22:00:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1b6042de270d7f9559745d593efdbf44 SHA-1: d8e4efa4ec7d64e5550150772ed80ae0a00474c8 SHA-256: 4b45f8b6fe04781e4af96de7dcfe4f7bfd2bd2f3fcd4f87b84b65bd5f081ed98
124 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous embedded URIs, with a high concentration of links on disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of external URIs and the ML classification strongly suggest an attempt to lure users to external resources for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8156

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://dugedepap.ru/aws?utm_term=how+to+increase+social+stats+persona+4
    • http://wepirafigezatid.22web.org/android_video_player_automatic_subtitles.pdf
    • http://nikubet.iblogger.org/43011585343.pdf
    • http://gesizuwumog.iblogger.org/wallet_apple_per_android.pdf
    • http://donurejin.iblogger.org/zozavuvapovamewava.pdf
    • https://cdn.sqhk.co/dudilirugido/WihggeR/download_speed_night_3_asphalt_legends_mod_apk.pdf
    • https://cdn.sqhk.co/kowumutajaw/bidihgi/34001044900.pdf
    • http://wekabamile.22web.org/rexakebumilovera.pdf
    • http://dosemamorozaj.22web.org/sfn_poster_guidelines_2019.pdf
    • https://cdn.sqhk.co/mepapogivoma/iciaw3i/45888453019.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://sixosotonipo.epizy.com/how_to_connect_qcy_earbuds.pdf
    • https://uploads.strikinglycdn.com/files/21e0c35c-902e-485d-9a1d-d078293faed0/vufalajebij.pdf
    • https://s3.amazonaws.com/mizeteb/manualidades_divertidas_para_nios_de_primaria.pdf
    • https://uploads.strikinglycdn.com/files/84ec837e-22f4-4b1f-a91d-52fd906ac129/javopivuliwetetimiroxuk.pdf
    • https://s3.amazonaws.com/bokelur/integer_rules_practice_worksheet.pdf
    • http://kagugazuviv.epizy.com/work_in_progress_report_excel_template.pdf
    • http://xigesema.epizy.com/bosopovafemexalubutam.pdf
    • https://uploads.strikinglycdn.com/files/dde084ac-7c99-4dfc-bd6d-a248182dd860/xowoweneminanorutevi.pdf
    • http://xituduriximujat.epizy.com/rejotimegam.pdf
    • http://fekunowan.epizy.com/tackling_organised_crime_osrs_guide.pdf
    • https://s3.amazonaws.com/joterige/blueberry_jam_nutrition_information.pdf
    • https://uploads.strikinglycdn.com/files/444459f4-5ce3-47e9-ab86-19ae6b04b8de/85851926245.pdf
    • http://gusizozubamu.epizy.com/vajanosizomef.pdf
    • https://s3.amazonaws.com/ragejufa/10172313907.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e639.bin
7b5ef2478851f194885f53ed89fdad176cb990f61c9393e62c972d0f0a22f04f
pdf-font-stream PDF embedded font (sfnt) at offset 0xE639 3048 bytes
font_01_sfnt_off0000f10c.bin
f62ce22fc41af64adf707fd218ffae2a7c90906f8430e9a2c1a45c93e2499d39
pdf-font-stream PDF embedded font (sfnt) at offset 0xF10C 4856 bytes