Malicious PDF — malware analysis report

Static analysis result for SHA-256 87604e77b2c2d3f6…

MALICIOUS

PDF

82.1 KB Created: 2021-04-19 12:32:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: b6f9ca73ebe1e66b9904441e9048bd44 SHA-1: f1ac3318184237ee9507e9a22d9c0d0a266f08a4 SHA-256: 87604e77b2c2d3f640cf30b13da7c95546a29f6660c4796b091340edd5418818
166 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with one heuristic specifically flagging it as a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The heuristic 'SE_LOLBIN_RUN_COMMAND' also indicates suspicious command execution patterns within the document text.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://botokaw.ru/strik?utm_term=original+us+army+m65+field+jacket PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4423780/normal_605ef393defb3.pdfIn PDF document text
    • http://zozavelomidabi.scienceontheweb.net/hp_elitebook_8560w_drivers.pdfIn PDF document text
    • http://eliyalte.com/fourth_definition_of_acute_myocardial_infarction2l41d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379618/normal_604fb07cce0f5.pdfIn PDF document text
    • http://mebel-albero.ru/variedades_linguisticas_del_espaolre26k.pdfIn PDF document text
    • http://jukojadijomefar.medianewsonline.com/12727339572.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371272/normal_5ff0e56a4bfeb.pdfIn PDF document text
    • http://wivuperafuzo.mypressonline.com/the_revenant_book_summary_sparknotes.pdfIn PDF document text
    • http://acgmgroup.ru/640103808705qd4e.pdfIn PDF document text
    • http://consumer-data-protection-bureau.com/how_many_pages_can_i_read_in_20_minutes7uwg5.pdfIn PDF document text
    • http://kifisafobubupo.mygamesonline.org/que_es_la_ontologia_en_filosofia.pdfIn PDF document text
    • http://alcexpress3.xyz/curl_of_gradient_of_vector_field3mabd.pdfIn PDF document text
    • http://lofitner.buzz/best_pop_songs_of_the_60s_and_70smlvr9.pdfIn PDF document text
    • http://fitdieta.com/how_to_clean_the_bissell_little_green_machinefq4c7.pdfIn macro / runtime command snippet
    • http://pesale.pro/maine_pyar_kiya_movie_openload5usca.pdfIn PDF document text
    • http://lofitner.buIn macro / runtime command snippet
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e05653fc-386e-4c8b-889d-738aee72c63e.filesusr.com/ugd/62421a_8ba399bda6ec443d840d5fa19f761f8c.pdf?index=trueIn PDF document text
    • http://desujiruvomeb.myartsonline.com/ielts_writing_task_2_vocabulary.pdfIn PDF document text
    • https://ef9935f7-a918-44a1-999f-f1d50a45e4a7.filesusr.com/ugd/b463f2_e10510cf5e3a4d0a8e9bbb1318b27d89.pdf?index=trueIn PDF document text
    • https://b7d3a0ae-8059-487b-8826-088776693174.filesusr.com/ugd/8d23e4_97e9f3b8397246d79e68ffafb051c511.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xoxaneral/repizo.pdfIn PDF document text
    • https://b4095e1f-5e43-4c35-8b28-ff0c3185c247.filesusr.com/ugd/9cc3de_4ca42359244a488ebd84fa0a0a58a68a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/datarofapakil/88921952669.pdfIn 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_off0001010b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1010B 5888 bytes
SHA-256: 93733a6a01eaa49861b29be69f21f6815ec9eecbc967e0596f7d373e1d6ff350
font_01_sfnt_off00011517.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11517 11248 bytes
SHA-256: 78853e7b99c80cf3281fdc38cbf827edfb081eb1b9201289d06628ef01a58aa2