Malicious PDF — malware analysis report

Static analysis result for SHA-256 4657e2d7d688fa52…

MALICIOUS

PDF

93.2 KB Created: 2021-05-03 20:14:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 3841b2f32470bf36ec1b1866a6de36fa SHA-1: 90ce3a2497d99012129b214dfed465ddc8e141ac SHA-256: 4657e2d7d688fa52c7150fc5a7a0602ebaea1c822eb061c4c56b8edfc5974026
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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 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://soxebez.ru/strik?utm_term=james+baldwin+academy+special+education PDF link annotation
    • http://kunewalijaxuna.getenjoyment.net/6796239988.pdfIn PDF document text
    • https://cdn.sqhk.co/jumupebuvi/HFLhdif/30263755614.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374957/normal_603076c2e359f.pdfIn PDF document text
    • http://avbox.org/ingles_1_eso_ejercicios_resueltosyw0st.pdfIn PDF document text
    • https://cdn.sqhk.co/dalubevemex/o6ij2pb/72911292015.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488090/normal_600b790feafe9.pdfIn PDF document text
    • https://cdn.sqhk.co/xuzuvazol/sdrgeZ6/galusoxojofid.pdfIn PDF document text
    • http://eagleaff.com/thermal_power_plant_in_hindixo20q.pdfIn PDF document text
    • http://trafikcezaodebayisi.com/61488817664f6fl2.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/jjgcjiX/bluestacks_hd_app_player.pdfIn PDF document text
    • https://cdn.sqhk.co/sebetite/WXhcKi7/8912442277.pdfIn PDF document text
    • http://awpmode.com/machine_learning_and_ai_courses_in_hyderabadbp9jj.pdfIn PDF document text
    • https://cdn.sqhk.co/nodujugebi/ieaEJja/88409084589.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vebusatoro.atwebpages.com/76096561656.pdfIn PDF document text
    • https://2f2ab42d-e0b4-4bd3-aa50-2430da1ff5fc.filesusr.com/ugd/eaf48f_17ff05f4bc75424fb9a35bb61f2b4309.pdf?index=trueIn PDF document text
    • https://1094d5c0-a920-47c7-a1de-7e2d56a92d84.filesusr.com/ugd/47b1e8_f13effa98d8c403e86be822d1f0f9703.pdf?index=trueIn PDF document text
    • https://3cde87c3-25ab-478b-b58d-ba072f1c7540.filesusr.com/ugd/255d97_5ad22b8ce6c0456bb6da298f1cd99a43.pdf?index=trueIn PDF document text
    • http://vigexosav.myartsonline.com/ukulele_tab_chart.pdfIn PDF document text
    • https://e4fb9bf1-a3d6-4767-9bf2-2a1021e5dc09.filesusr.com/ugd/53cfc7_f9344cfde40a494ba966cb82cd0e243e.pdf?index=trueIn 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_off000127e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127E8 5448 bytes
SHA-256: 46edeaa1caff5886d2413a56bdd31e7bfeb06ead39f58f78d9a93541159338d4
font_01_sfnt_off00013a73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A73 13924 bytes
SHA-256: eda8c9579c004abcc2c65e0cb487433881d9dbbbd89f6ed79cc78931fade440b

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