Malicious PDF — malware analysis report

Static analysis result for SHA-256 6df387eb136fa305…

MALICIOUS

PDF

77.6 KB Created: 2021-03-20 00:56:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 9ef41b775d368f20ad6f1b0cafc7082b SHA-1: c66dbb1662450df81d0405f631dfedf7b1bbf69a SHA-256: 6df387eb136fa305928dc74a8aae6bb4769486ed400d5daac6d988e9c9466e41
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains, suggesting a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. The embedded URL and the document body's reference to a 'worksheet' further support a lure-based attack pattern.

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://jumiwimov.ru/wix?keyword=billions+in+change+documentary+questions+worksheet PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4378641/normal_5fe0b9957a2e0.pdfIn PDF document text
    • http://esagafow.fun/dobetigir3ab6t.pdfIn PDF document text
    • http://juzufezike.mygamesonline.org/91568292678.pdfIn PDF document text
    • http://o-karte-kopilka.com/fatilisifoxezekapelasuh6ws3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373240/normal_5fe94fd7e2d7c.pdfIn PDF document text
    • http://ergors.space/475523790039rua7.pdfIn PDF document text
    • http://health2health.online/146749109090vrgn.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/fa01eebc-c63c-479f-97d4-8e499cad7e2a/58942850700.pdfIn PDF document text
    • http://nimanexobubibub.onlinewebshop.net/elements_of_poetry_ppt_slideshare.pdfIn PDF document text
    • https://1e16da7b-5b4f-4122-a3c4-5c88c9d97cf7.filesusr.com/ugd/83f04e_ee2128d061fb45dca8a9f65ed13f8024.pdf?index=trueIn PDF document text
    • http://jelunegizubu.atwebpages.com/79894910824.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e7d6d28-b136-48e2-bcf5-77dbab70a2d8/koxojopetodabuwunotew.pdfIn PDF document text
    • https://eb40363d-1d1f-4170-a897-f23f0f433116.filesusr.com/ugd/2a1429_e3cde023a487445fa9396a417095e29e.pdf?index=trueIn PDF document text
    • https://e0d0d77b-4c00-4265-bc22-f0cc5cf11ada.filesusr.com/ugd/957eb4_99f2e3969cf54655b27d70bd08e20de2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a482c080-d977-40e7-9f17-0013969be705/13543093283.pdfIn PDF document text
    • https://de2a8dfc-dc8d-4d62-be3b-f97abdd17bf6.filesusr.com/ugd/c722c2_46ca889014074861bed6efd13ef902df.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ede7622a-6c91-4486-8992-a4aedddca38c/english_vocabulary_test_app.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1f80b27-98db-4e4e-b00c-505f071c85ab/which_blood_glucose_meter_is_more_accurate.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd81b857-4221-4cd7-9664-724591169c93/luvolavina.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd28b558-b5ef-49b1-920d-dff8494ebaf8/points_lines_and_planes_worksheets_answers.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_off0000ef07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF07 5784 bytes
SHA-256: c35a714e99254c93d8ea803def3e21a0849a9285d01073b33de31653818d1d47
font_01_sfnt_off000102a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102A3 11312 bytes
SHA-256: b99c062d9fae8b7c3ee935d60709eb81fa71b6ff3752189c559d9cb9f35a367c

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