Malicious PDF — malware analysis report

Static analysis result for SHA-256 27e8ba8e66c6f7e1…

MALICIOUS

PDF

76.3 KB Created: 2021-03-22 02:49:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3919c58747443332d564171b37d24c1c SHA-1: 43da080e15afeda15e0f7685c8a0cfc025fde857 SHA-256: 27e8ba8e66c6f7e1fab1be22f76ec026b520623bc14f72d68166efcb8f90e8c3
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, a technique often used in SEO link farms to manipulate search engine rankings or to distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent. The presence of external URIs suggests an attempt to redirect the user to potentially malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jumiwimov.ru/wix?keyword=unity+in+diversity
    • http://deladinabixek.sportsontheweb.net/chapter_2_business_ethics_and_social_responsibility_ppt.pdf
    • https://static.s123-cdn-static.com/uploads/4393358/normal_5fdda19cafc35.pdf
    • https://ludugekokokak.weebly.com/uploads/1/3/5/3/135313409/sipesar.pdf
    • https://cdn-cms.f-static.net/uploads/4391319/normal_604acb87f1f50.pdf
    • http://vufiwopader.medianewsonline.com/general_science_asvab_study_guide.pdf
    • https://medowiwufaj.weebly.com/uploads/1/3/4/4/134480571/wemiwopexevomapa.pdf
    • https://vamalogobiw.weebly.com/uploads/1/3/4/6/134696595/gujobox.pdf
    • https://static.s123-cdn-static.com/uploads/4470385/normal_5fffc757d182a.pdf
    • https://cdn-cms.f-static.net/uploads/4413347/normal_600b6a768936e.pdf
    • https://wepebajaka.weebly.com/uploads/1/3/4/5/134588919/tuzotarafumokalepe.pdf
    • http://suvolupijiro.mygamesonline.org/fibinorebub.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/6bd1cf0f-31fe-4804-9fea-683c8e8dbbab/interview_questions_and_answers_for_school_administrative_assistant.pdf
    • https://uploads.strikinglycdn.com/files/59dca4a1-0368-461d-96ce-aac74227ab41/19053923214.pdf
    • https://uploads.strikinglycdn.com/files/b071c0b6-26b3-49ec-8645-ea1541bb0910/shark_rotator_professional_lift_away_nv501_reviews.pdf
    • https://uploads.strikinglycdn.com/files/3dc6a90e-68f9-40b1-8f43-28670e8ee68e/bowflex_exercise_chart.pdf
    • https://ac65beef-1c88-4b01-a948-251493ed82f2.filesusr.com/ugd/09857b_895c86b927084d689d1b84a9c1e7faf0.pdf?index=true
    • https://uploads.strikinglycdn.com/files/a03c8c38-c735-42e7-bddf-da0fd15ef5fc/ruroxejobuvof.pdf
    • https://uploads.strikinglycdn.com/files/db014706-4cd4-4776-b8d8-154d4c906ff4/epson_workforce_wf-3540_wireless_all-in-one_color_inkjet_printer.pdf
    • https://d5cf7a15-73c9-49c9-ad57-d4f0303abb0c.filesusr.com/ugd/0d002d_2b85bcc4ce024fafbf1f16560c9c07f7.pdf?index=true
    • https://uploads.strikinglycdn.com/files/edb42098-0c77-447b-a4a5-8f8643958a3f/are_best_recliners_good_quality.pdf
    • http://sulorowanutabu.atwebpages.com/jemepamavoz.pdf
    • https://uploads.strikinglycdn.com/files/2d7c9079-a124-4062-a0f9-1bf02634ac84/47479186841.pdf
    • https://5f8b0e40-2141-4341-98ab-6145db4b8156.filesusr.com/ugd/2072cd_676c17d5695b4ddab223ccc95eec9796.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecb2.bin
e8169a05aff54d2e45f3934f290b31727890dcd80a47d58d091b826160c5b9cc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECB2 4728 bytes
font_01_sfnt_off0000fce9.bin
eb55991b227a45edc11f47782a9a7af44c75e9ed62c5c78f5aed42f2361f2fb2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE9 11336 bytes

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