Malicious PDF — malware analysis report

Static analysis result for SHA-256 aed46acc1eea0c87…

MALICIOUS

PDF

74.4 KB Created: 2021-06-09 22:06:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: e8ef1dc78bf3e99fb94d12f2f45e39f1 SHA-1: 6c2f8cd86860fbfce51b247e0b8d4b5e77b84a16 SHA-256: aed46acc1eea0c87c641b8f965a0fab2aa7b339ba05718dba9ceaa7bbd658e5b
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan payload. It contains numerous embedded URLs, many pointing to link farms on disposable hosting, designed to obscure the ultimate malicious destination. The primary malicious URL identified is https://chcial.ru/pbw?utm_term=mp4+convert+to+mp3+converter+free+download, which likely serves as a lure for downloading further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://chcial.ru/pbw?utm_term=mp4+convert+to+mp3+converter+free+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4476768/normal_606e1b515addb.pdfIn PDF document text
    • https://berizezemimuto.weebly.com/uploads/1/3/2/6/132695806/tifopurevi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388065/normal_6006594d86008.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450502/normal_5fc5bdaf05be7.pdfIn PDF document text
    • https://gegizadewer.weebly.com/uploads/1/3/1/4/131482997/277a072.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425726/normal_60c08c9b8b7cb.pdfIn PDF document text
    • https://tevupuzenoxa.weebly.com/uploads/1/3/6/0/136009769/5071299.pdfIn PDF document text
    • https://lisujawot.weebly.com/uploads/1/3/6/0/136024823/nusuz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447640/normal_60079e586fa5a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lojapaveb.pbworks.com/f/como_configurar_un_control_universal_para_tv_kalley.pdfIn PDF document text
    • http://nubuzefi.pbworks.com/w/file/fetch/144534351/what_is_romantic_realism.pdfIn PDF document text
    • http://ruxafonan.pbworks.com/w/file/fetch/144516834/vomigavasajegi.pdfIn PDF document text
    • http://bibosopimugo.pbworks.com/w/file/fetch/144629592/zitedimikatedoxaxeli.pdfIn PDF document text
    • http://wiwedano.pbworks.com/w/file/fetch/144765807/how_to_turn_off_delonghi_gas_heater.pdfIn PDF document text
    • http://fisukafetif.pbworks.com/w/file/fetch/144643380/what_is_bigger_faster_stronger.pdfIn PDF document text
    • http://nusuwoxub.pbworks.com/w/file/fetch/144426978/97737793848.pdfIn PDF document text
    • http://nugewil.pbworks.com/f/44489012711.pdfIn PDF document text
    • http://jadubunid.pbworks.com/f/sapegitazuxipuridugu.pdfIn PDF document text
    • http://ritijix.pbworks.com/f/speaking_intermediate.pdfIn PDF document text
    • http://malamojozag.pbworks.com/f/how_to_connect_ihome_bluetooth_speaker_ibt74.pdfIn PDF document text
    • http://vinivat.pbworks.com/f/jazzy_select_elite_reset_button.pdfIn PDF document text
    • http://veposasidot.pbworks.com/w/file/fetch/144770394/the_golden_goblet_summary_chapter_2.pdfIn PDF document text
    • http://gokuluxitup.pbworks.com/w/file/fetch/144896232/61911883938.pdfIn PDF document text
    • http://wekibivu.pbworks.com/f/bartender_ultralite_datamax_download.pdfIn PDF document text
    • http://guwodav.pbworks.com/w/file/fetch/144895584/951247627.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_off0000e33d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE33D 5532 bytes
SHA-256: 150ea97fc9b0e6e31b787feeda3ff2f3c7cb021fdb54c54f7ad46d480cef2431
font_01_sfnt_off0000f624.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF624 11172 bytes
SHA-256: 8abb10beb0c35952ee534a049840ae1b1b47e6835cb43ed88db7806801c27df6