Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b5d189058457f8d…

MALICIOUS

PDF

84.9 KB Created: 2021-05-17 06:06:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 3de6ea96e9399c08f4617ae1e7eceda2 SHA-1: ed7b1b873b7042254bae5d46ec9e57c1a499b510 SHA-256: 1b5d189058457f8dfa524c2a7ed59e3de5675c5a65463508ab507ec3765e71f5
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 or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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://xajibur.ru/strik?utm_term=excel+vba+find+oldest+date+in+range PDF link annotation
    • https://cdn.sqhk.co/dewufidabo/nVyie6U/nufuduwudolokufesudi.pdfIn PDF document text
    • https://cdn.sqhk.co/pawosuku/C6JhhBq/torn_labrum_recovery_time_baseball.pdfIn PDF document text
    • https://cdn.sqhk.co/nejijilo/vhgbzYh/agent_vinod_full_movie_free_bluray.pdfIn PDF document text
    • https://cdn.sqhk.co/pelotuwew/Z7oS7hj/luke_bryan_drink_a_beer_song_meaning.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369334/normal_602f305c0734b.pdfIn PDF document text
    • https://cdn.sqhk.co/vizodejo/e2mjmLm/parallel_space_64_bit_support_lite_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494429/normal_602ac1f2570db.pdfIn PDF document text
    • https://xasonametig.weebly.com/uploads/1/3/2/3/132303127/1883261.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369643/normal_602071333f899.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367279/normal_6017c0824fb85.pdfIn PDF document text
    • https://zizudenavoxe.weebly.com/uploads/1/3/4/0/134017195/c512b2.pdfIn PDF document text
    • http://rowaxuxot.22web.org/time_and_calendar_worksheets_for_grade_3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/sitozi/credit_bureau_report_explanation.pdfIn PDF document text
    • https://s3.amazonaws.com/wulotugadag/topology_optimization_approaches_a_comparative_review.pdfIn PDF document text
    • http://parijuxurumemew.epizy.com/61587548810.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e45fc2dc-b0d9-40f4-872b-bca3d36056ee/concept_mapping_nervous_system_worksheet_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ca22d52-017b-45b2-882a-de5479e285a8/asp.net_mvc_tutorial_kudvenkat_blog.pdfIn PDF document text
    • https://s3.amazonaws.com/megelugik/state_of_louisiana_literacy_test_answers.pdfIn PDF document text
    • http://zivuvosiz.epizy.com/zokapepulesulabofun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb163b6c-cafc-4730-bf47-caf9bccea9e1/kenmore_sewing_machine_model_385_parts_list.pdfIn PDF document text
    • http://xatovafibusatip.rf.gd/kadijobasanugusosi.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_off00010aec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AEC 5412 bytes
SHA-256: 079b95a9f7f85f91bf6fc427455b99968911053cc0e5a8ebdf24ea5b419b6097
font_01_sfnt_off00011d71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D71 11352 bytes
SHA-256: d5d78afebde93b64b78def5a8f1f2fc078e857f33f1b33aa1774dcbba2a58ba1