Malicious PDF — malware analysis report

Static analysis result for SHA-256 90711c3be45c1866…

MALICIOUS

PDF

71.8 KB Created: 2021-04-26 11:53:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 4799a88504077df7e037e631ba8826a4 SHA-1: b79a09c7f1f517f217635839cf2a230063868f80 SHA-256: 90711c3be45c18662d7eb474d9c8f3ea55cb207a6a55ede11ebfd9d7268a54ab
124 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, many pointing to disposable domains and configured with UTM parameters, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for distributing malware or conducting phishing campaigns. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8093

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://baarspo.ru/strik?utm_term=curso+de+ingles+basico+para+principiantes+teacher+bocarando PDF link annotation
    • http://kvyovk.xyz/beden_kitle_indeksi_nasl_hesaplanr_formlbp65o.pdfIn PDF document text
    • http://sodaapp.club/5968767639979yla.pdfIn PDF document text
    • http://shopyou.online/vuxagirefasony4vte.pdfIn PDF document text
    • http://imkl-checker.com/tudavibokaefm4o.pdfIn PDF document text
    • https://cdn.sqhk.co/pulazapusaw/OXhbW4b/pajojawevadabur.pdfIn PDF document text
    • http://mini-cam-v2.club/dodulesijavulvumvi.pdfIn PDF document text
    • http://trendmobile.ru/define_distress_in_abnormal_psychologyxi4fw.pdfIn PDF document text
    • https://cdn.sqhk.co/fimirexuf/jgPjgAu/hallmark_tv_series_2019.pdfIn PDF document text
    • http://creamwalls.space/delopegagokenokibaridiwox68dxw.pdfIn PDF document text
    • https://cdn.sqhk.co/xakelafu/jllhgie/nupinugasatoke.pdfIn PDF document text
    • https://cdn.sqhk.co/ximepadogi/fTxghhf/switch_pro_controller_charger.pdfIn PDF document text
    • http://prostochillforum.fun/pokemon_cafe_mix_charactersb62eg.pdfIn PDF document text
    • https://cdn.sqhk.co/dibitarebizu/sgijfia/daxumidufod.pdfIn PDF document text
    • https://cdn.sqhk.co/fowujizul/fjhgeDL/surf_fishing_report_destin_fl.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/feb0110e-4c94-43d1-b484-6b04d68366ce/sony_dav-dz170_5.1_channel_dvd_home_theater_system.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98a5092c-6fd3-4224-a090-9a84b634c284/how_to_open_sharp_microwave_drawer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62f9b587-fae8-4b13-985f-69e1d68743a3/recursive_methods_in_economic_dynamics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f410007d-06ca-4f60-929d-bce21b9aed4c/gejekof.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c4da366-8a47-48e8-a886-8b80fd672ee0/horde_pvp_vendor_pandaria.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0a23ff8-0d4a-488f-a121-562680cd9176/xanathars_guide_to_everything_spell_scrolls.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4e8062e-d6f5-41e3-ac40-b8b8dc4d20b7/what_to_do_if_washing_machine_is_not_draining.pdfIn 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_off0000ea96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA96 5380 bytes
SHA-256: 8501b629e0c827d677281379a95321bff9cf435056a2c0ccf970fde2b5525a40
font_01_sfnt_off0000fccf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCCF 11916 bytes
SHA-256: 2c9e419717727d23e9ab959f7ee44fb6e77e90a9093ff5c540922f920d53a481