Malicious PDF — malware analysis report

Static analysis result for SHA-256 859e03df9ecbae09…

MALICIOUS

PDF

75.1 KB Created: 2021-03-24 14:13:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 5cba9a53af1585e71dca8677f668c0b0 SHA-1: 6341ef6961eb28779b99da6c54572919045fc5af SHA-256: 859e03df9ecbae09398f3e9c92bfef31d9af35ddd1ac0d983183586141a5369c
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are part of a link farm hosted on disposable domains, suggesting a phishing or SEO poisoning attempt. The primary external URL identified is 'https://zajinet.ru/award?keyword=dr+aidin+salih+ger%25C3%25A7ek+t%25C4%25B1p+pdf', which is likely part of a malicious campaign. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://zajinet.ru/award?keyword=dr+aidin+salih+ger%25C3%25A7ek+t%25C4%25B1p+pdf PDF link annotation
    • https://cdn.sqhk.co/guvevifowo/MHhijgx/cute_captions_for_selfies_with_friends.pdfIn PDF document text
    • http://esportzmlevent.com/what_is_end_stage_arthritis_of_the_shoulder5f1jc.pdfIn PDF document text
    • http://simcars.ru/34729076187xc8ba.pdfIn PDF document text
    • http://rozujed.sportsontheweb.net/65566115106.pdfIn PDF document text
    • http://nanamojuvimujo.medianewsonline.com/39622790332.pdfIn PDF document text
    • http://vbnmcxz.xyz/chiraq_instrumental_free2ho99.pdfIn PDF document text
    • http://yourcy.com/bibewupa3lnts.pdfIn PDF document text
    • https://cdn.sqhk.co/doxowite/US5Nz3n/servsafe_test_free.pdfIn PDF document text
    • https://cdn.sqhk.co/tonatozi/djfhbUH/camilo_torres_memorial_de_agravios.pdfIn PDF document text
    • http://lezigovedavide.getenjoyment.net/pevukitapegoselekabetiluv.pdfIn PDF document text
    • http://load-bcp.com/gijavugofinawunttgt.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/f042b488-86d2-4294-a5b3-16710ad70cc4/18526749660.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d913320f-ab4f-47c7-9ed4-c008bda9a638/audio_technica_at-lp60x_belt_drive_turntable.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e9df97c-096b-4809-9c22-25bf57118c24/que_es_el_contexto_de_un_pasaje_biblico.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f095440-9ec7-4679-a81e-c3daa1396aae/honda_pressure_washer_pump.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e23b1c4-37af-4d8c-81c7-779086c9e187/surah_yaseen_full_reading_download.pdfIn PDF document text
    • http://wobanunep.myartsonline.com/boy_scouts_of_america_lawsuit_phone_number.pdfIn PDF document text
    • http://retiziwo.myartsonline.com/modern_arabic_language.pdfIn PDF document text
    • https://6d251753-49d0-4f5b-a278-10ed1cacc9d0.filesusr.com/ugd/5c139a_1d40da9fe1b3413cb580ed0ed7139644.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a0826ab-2f3d-4476-aab0-ea3f9cc5953e/dungeons_and_dragons_2_full_movie_online_free.pdfIn PDF document text
    • https://e61e9f85-32c5-4861-9fd4-b89109084c35.filesusr.com/ugd/2e4eb4_e9ec0b3a5281429f8c0fcaa6ae1d429d.pdf?index=trueIn PDF document text
    • https://f867c6cd-7aae-4938-a634-6821dcb48262.filesusr.com/ugd/eb45fa_e1568ef5f08b40e9996a3b40c10651c2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5cf521ad-1bf2-4399-bca3-5d05dece37f7/why_isnt_my_kenmore_gas_dryer_heating_up.pdfIn PDF document text
    • https://71a0d42b-91d5-4e94-9338-ff69ca8a624b.filesusr.com/ugd/e5d5e5_607cbb16ee3d4bbab8730a2559b77a0e.pdf?index=trueIn PDF document text
    • https://57933e30-1e86-4cbe-ad2b-777cb72f9932.filesusr.com/ugd/235f1a_99816d3ec1cc489387af7e60eff8537e.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_off0000e4a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4A3 5580 bytes
SHA-256: 7eca9e090a0a70d8f16902a18ffaba83d475ca06f63347b15bb08eca0c032d40
font_01_sfnt_off0000f7a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A3 11960 bytes
SHA-256: 5133d1b4686a05b1964af1d94b65f8d2c79be8668c4b41583ab4f513f7847d32