Malicious PDF — malware analysis report

Static analysis result for SHA-256 84822f122d6c4f4b…

MALICIOUS

PDF

82.9 KB Created: 2021-06-04 17:12:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 5f46633a436f301aa230f30490c043af SHA-1: 5b8d824d3ba77fe805f01c0e902f5e8bd072e9c4 SHA-256: 84822f122d6c4f4bf3ae150c7770be49dc1bf43fa21cbcc2f9445c34c1a6ef7e
134 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan distribution attempt. It contains an embedded URI pointing to 'chcial.ru', which is likely part of a phishing or malware distribution chain. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the PDF is designed to host multiple links on disposable domains, further supporting a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=how+to+make+a+budget+for+nonprofit+organization PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4470017/normal_6005240ed181e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://werinenimuta.pbworks.com/f/how_to_play_youtube_on_android_auto_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60f2d7d1-2d68-4ea5-9bce-d965f5052281/everyday_use_alice_walker_symbols.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd073cb1-e085-4a37-9b71-f42361ad54d5/shampoo_solutions_for_oily_hair_reddit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/798308d0-f681-4c16-b39d-8ce82fd63fd6/97249706389.pdfIn PDF document text
    • http://lomubel.pbworks.com/f/92651320853.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db38289c-0778-4a17-8bac-9cd1b10d3793/87603279088.pdfIn PDF document text
    • http://kufavuva.pbworks.com/w/file/fetch/144572352/la_biblia_reina_valera_1960_en_audio_gratis_para_descargar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3976a3c8-cb22-4bb6-a5b5-5bf06e853ece/how_to_clean_a_keurig_with_cleaning_vinegar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8178297a-34ee-41e0-8edd-4202a1c821ef/rubir.pdfIn PDF document text
    • http://vaporezikumu.pbworks.com/w/file/fetch/144614778/wekupavu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83059c49-2d31-4c51-9c64-364bd1f18110/dumelikuzofumajukobi.pdfIn PDF document text
    • http://kejuziz.pbworks.com/f/what_is_pollution_for_project.pdfIn PDF document text
    • http://magobok.pbworks.com/w/file/fetch/144497316/praxis_test_5354_study_guides.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15417d40-81d4-4adc-a738-5016b3e989fb/drawing_app_for_mac_pro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0df6038b-28bb-458a-b907-0e6ad7b0f96c/anaconda_2_full_movie_in_hindi_hd_1080p.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_off00010518.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10518 5456 bytes
SHA-256: ba49b41f92b3f30b636acdf62f2ab0e22bf71296174777947d4b903011558ff6
font_01_sfnt_off000117ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117AC 11408 bytes
SHA-256: 5ed25b89bbc1abcc4293c05c859c30e88f3892a1a86b409c31296313c121ec1f

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