Malicious PDF — malware analysis report

Static analysis result for SHA-256 5366b8fdc166e88d…

MALICIOUS

PDF

72.0 KB Created: 2021-03-28 00:50:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: c096e24567bc483283cfa90a4b89f7bb SHA-1: 72383c16eaf97e6088f721a96c09f8cab4b1afbf SHA-256: 5366b8fdc166e88ddea142cb7105251528297534d8a0b7f87546efa13dce9061
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs and is flagged by heuristics as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://nipisod.ru/strik?utm_term=monitor+cardiaco+polar+ft1+pre%25C3%25A7o PDF link annotation
    • https://cdn.sqhk.co/tigixexaxi/ihghehf/mountain_climber_machine_workout.pdfIn PDF document text
    • http://jerabigemoz.sportsontheweb.net/apgli_application_form_12.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470524/normal_604400bef3bc5.pdfIn PDF document text
    • http://telgrm.site/72873283254fw965.pdfIn PDF document text
    • https://cdn.sqhk.co/jojikoxazew/ggdgiVV/tasty_blue_full_game_free_download.pdfIn PDF document text
    • http://2220202.ru/127206662360tyoc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497685/normal_6031ba8d06041.pdfIn PDF document text
    • http://domavera.ru/why_is_my_jbl_2_speaker_not_workinggrd4r.pdfIn PDF document text
    • https://cdn.sqhk.co/jopubelo/hfjbgcV/mexoso.pdfIn PDF document text
    • https://cdn.sqhk.co/xelalizogim/cDhdIid/lebugusitejenojowexovixe.pdfIn PDF document text
    • http://kirakexig.mypressonline.com/sexulegutidopugovobugetav.pdfIn PDF document text
    • http://jonipifenukiz.mygamesonline.org/vevupinogulasevonur.pdfIn PDF document text
    • https://cdn.sqhk.co/tororukiwuri/6gfyfQy/3d_driving_class_mod_apk_android.pdfIn PDF document text
    • http://swiss-family.space/codigos_para_control_universal_general_electric_4_digitosuo40e.pdfIn PDF document text
    • http://negozio50sconto.info/papatufijawunugorixudroo0e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463552/normal_5fd7b5937fc9c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454562/normal_6003d1bddca86.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c01188fd-d8af-4b86-846b-090f7ecd58d8.filesusr.com/ugd/9058e5_73e73c909a904320be5f0f64a6cd3a14.pdf?index=trueIn PDF document text
    • https://19508648-7f28-415f-8121-b57715dc1465.filesusr.com/ugd/9734e7_d158d3af49934d2d94e3108d258092d1.pdf?index=trueIn PDF document text
    • https://234a0c07-d908-4261-bb83-16b3c96a9b04.filesusr.com/ugd/73e0e6_969df49af9444c999b62b5b211f677d0.pdf?index=trueIn PDF document text
    • https://ac3db616-04cb-40f1-8357-c67041f5e20c.filesusr.com/ugd/eda9ba_e383fb96da334c22b958bf059d956229.pdf?index=trueIn PDF document text
    • https://3175e58c-9db9-4d87-bcb9-15e03531d93d.filesusr.com/ugd/c93210_16b3a3bf253c480abc47ebe2f9ca8cee.pdf?index=trueIn PDF document text
    • https://591379ed-26d0-4405-baa7-5b8dadede013.filesusr.com/ugd/866ffa_3d3d9fc9b30d4640ae6088384b2c152b.pdf?index=trueIn PDF document text
    • https://18bc7be3-897e-46c1-a475-efc190d089bd.filesusr.com/ugd/62845f_1758e457025b4e5e8fae2e3a2bb2979e.pdf?index=trueIn 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_off0000d77c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD77C 5208 bytes
SHA-256: 2967248920b8c4129c6f70533468c1f5d6e7c90108f8248dab57769bb5f09934
font_01_sfnt_off0000e915.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE915 12812 bytes
SHA-256: 182ceadd26c3c2e712855da5bd04945ccbded7c34476f536b08051fa18c47bcd