Malicious PDF — malware analysis report

Static analysis result for SHA-256 637b0fc10524208e…

MALICIOUS

PDF

75.4 KB Created: 2021-03-28 04:05:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f96212a72a6dd9b3bd2b936928c65458 SHA-1: bf33f038fc06535dc409520c1195baa555d60f75 SHA-256: 637b0fc10524208e803248c4ec5f57f042d34f1309b1ecf6b1fcfa20a07bf881
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are flagged as part of a link farm, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a redirection chain designed to lead the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 5

  • 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
  • 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://vilenefex.ru/123?utm_term=kanchan+assamese+serial+song++asomi.+in
    • http://sportplays.ru/58821451465iqthx.pdf
    • http://reduslimitalia-oficial.site/tesotoforiwdmob4.pdf
    • http://classkaod.ru/free_diary_of_a_wimpy_kid86d57.pdf
    • http://vashmaster.info/how_to_make_a_micro_sim_into_a_nano_simt4z7k.pdf
    • http://tokio-2020.fun/wosomop93f81.pdf
    • http://info-pages.ru/age_of_empires_2_the_conquerors_expansion_cheatsnv54x.pdf
    • https://cdn.sqhk.co/labifikup/72ghxgG/20634499238.pdf
    • http://wellwork.site/sitetekuwisulazokasipedz8oxd.pdf
    • http://flipping-car.online/fapafoseab4dk.pdf
    • http://uk-delfin.ru/36805596666y18px.pdf
    • http://zikuwojanubeg.iblogger.org/ppt_timeline_templates_free.pdf
    • https://cdn.sqhk.co/dawafawux/ghh1Jgg/flight_pilot_simulator_3d_free_apk.pdf
    • http://avtovishki-msk.ru/64726224605kln6k.pdf
    • https://cdn.sqhk.co/zarifabidit/ZgeGhiA/android_studio_sdk_manager_missing_from_tools.pdf
    • http://romeoplanet.club/74991116670oqwjk.pdf
    • http://nigma24invest.online/puvadevizevif08f3u.pdf
    • https://cdn.sqhk.co/fikalibumi/ODgjaha/6193359377.pdf
    • http://wagelesakofaj.22web.org/bmw_x4_2020_brochure.pdf
    • https://cdn.sqhk.co/jumifokujuje/Bgilgcm/kingston_outdoor_basketball_court.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://kavejanunar.epizy.com/adulthood_stage_of_human_development.pdf
    • https://uploads.strikinglycdn.com/files/d927479e-b3a4-48cc-bdc4-037b73b8f3a5/ethical_hacking_course_salary_in_india.pdf
    • http://pobalupusovejo.epizy.com/rogue_leveling_guide_classic_wowhead.pdf
    • https://uploads.strikinglycdn.com/files/676259dc-51c1-4f43-930e-20d3eca2f4e3/lugodix.pdf
    • https://uploads.strikinglycdn.com/files/71d8ae29-f555-4b12-8928-2de56e17e7f7/can_i_share_a_video_from_facebook_to_whatsapp.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dcf5.bin
16237b91d334237238b955d110bb17a5c4b0b7353bc6f623ef846c7fb513ff75		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF5 4924 bytes
font_01_sfnt_off0000ed73.bin
2a9d159bac1320316f65aca1c8255da6cfd7890689f4de6001f8c91f2aa7e1d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED73 11028 bytes
font_02_sfnt_off00011302.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11302 4324 bytes

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