Malicious PDF — malware analysis report

Static analysis result for SHA-256 40bf481e641c7a19…

MALICIOUS

PDF

73.4 KB Created: 2021-03-18 04:09:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 39186aad888effccecf3c85d6fc62243 SHA-1: 157b5c4c88f7e5fbe50b912912262258caad6faa SHA-256: 40bf481e641c7a19df36b945bc02d89890ddcc3f8e9febd9386b94ced9cd0c47
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to distribute malware or phishing content. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and ML classifier flagging further supports malicious intent. While no scripts were directly extracted, the structure and URL patterns are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://pelibifir.ru/123?utm_term=adobe+audition+setup+for+pc PDF link annotation
    • https://lalusaguru.weebly.com/uploads/1/3/4/6/134611329/5375353.pdfIn PDF document text
    • https://cdn.sqhk.co/ritasuxa/DJhiy3N/table_top_racing_vita_trophy_guide.pdfIn PDF document text
    • http://pagipuniluti.iblogger.org/btw_aangifte_en_belastingdienst.pdfIn PDF document text
    • https://cdn.sqhk.co/sajixobuko/f4jfZhd/short_a_word_family_games_online.pdfIn PDF document text
    • https://cdn.sqhk.co/vumojakizaw/1jidEie/idioms_worksheets_with_answers.pdfIn PDF document text
    • https://cdn.sqhk.co/joxonorapa/ggHiigd/fubenimesumeli.pdfIn PDF document text
    • https://lanekugufer.weebly.com/uploads/1/3/5/3/135351315/laxewevixeb.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/bfda9764-c550-4ca2-ba2d-88e159d222b7/lifevilivugezubop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8edfd877-f981-411e-b2c0-92c0a22f1571/22535255644.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/47e03c8b-09f2-4da3-a0f7-1cd7f5b733f1/why_is_als_difficult_to_diagnose.pdfIn PDF document text
    • https://s3.amazonaws.com/tesodagiwor/61526899696.pdfIn PDF document text
    • http://lekozuni.epizy.com/free_agreement_template_between_two_parties.pdfIn PDF document text
    • https://s3.amazonaws.com/xezujuxoz/capitaland_annual_report_2018.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a885a357-042e-4851-ac30-8df908ce0ff4/autocad_civil_3d_2013_tutorial_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b46cd5c6-a809-47d7-98d2-c1d179caad81/how_to_create_new_paragraph_in_excel_cell_on_mac.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3984f5f2-5b48-4ea9-8eb2-60b46308d1cb/what_does_light_relief_mean.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8a5c119-2d80-4a1a-9d26-e170d3588464/57072588134.pdfIn PDF document text
    • https://s3.amazonaws.com/xezujuxoz/reed_finance_salary_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9b81cb5-0b3a-42eb-9eab-db8b7f8a737b/how_to_win_at_the_sport_of_business_summary.pdfIn PDF document text
    • https://s3.amazonaws.com/jirebonudur/diary_of_a_wimpy_kid_all_books_names.pdfIn PDF document text
    • http://mijikudetixo.epizy.com/38878477201.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_off0000e370.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE370 5248 bytes
SHA-256: 4b7730fa381ebca849fb99704ea5e2ce35ec36c441d1e643ee1399d2f4a4529f
font_01_sfnt_off0000f551.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF551 10412 bytes
SHA-256: 35b95e804685af69e939d70afdbeabb158eafd77c9fffb55ae4e044d42c89e68