Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d436645f4e41acd…

MALICIOUS

PDF

74.1 KB Created: 2021-03-24 21:15:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 5fc847424db2d61bf577c75ef17b3d0b SHA-1: 4030d6ca5ab9eb2c1e9cece90fd4f8cf08271fa8 SHA-256: 8d436645f4e41acd2a4164a5e1406889c62e44df51166ffda1e42191fb29f046
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/award?keyword=possibility+and+probability+exercises+pdf PDF link annotation
    • http://ehaberdevlet.com/denulogojogijhzs.pdfIn PDF document text
    • http://dizofuses.mypressonline.com/classifying_animals_worksheet.pdfIn PDF document text
    • https://kogexabisuzim.weebly.com/uploads/1/3/4/3/134322867/baed797.pdfIn PDF document text
    • http://veronaital.space/68841369113pn8q4.pdfIn PDF document text
    • http://ukrdomonis.xyz/maximum_flight_duty_periodyjkuc.pdfIn PDF document text
    • https://foguvebosep.weebly.com/uploads/1/3/5/3/135315209/9680d8b6.pdfIn PDF document text
    • http://p-kavkaza.ru/how_much_is_a_ds_lite_worth_2019rxudg.pdfIn PDF document text
    • http://haustova.com/dipiv7tp83.pdfIn PDF document text
    • http://lnstagramlivesupportcenter.com/5058384811808cvd.pdfIn PDF document text
    • https://motetokazifizi.weebly.com/uploads/1/3/4/8/134885494/9311988.pdfIn PDF document text
    • http://003-center.ru/great_hall_of_the_bulls_period_and_era_when_it_was_createdfej5a.pdfIn PDF document text
    • http://zereteleriw.getenjoyment.net/84033706987.pdfIn PDF document text
    • https://welavomuwaj.weebly.com/uploads/1/3/4/6/134633166/4221781.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ba428ff1-d53d-4eb5-bdb2-cc960067f420.filesusr.com/ugd/7041e4_bf3a0664cff74a3c9c12803c6c40568c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6db8c50-c257-40d9-9e29-11269bb8b131/picostation_m2_reset_to_factory.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33ef0696-c34b-4149-8372-678b3ce7b942/evaluacion_de_comunicacion_tipo_ece_para_cuarto_grado.pdfIn PDF document text
    • https://6448a590-b571-4b71-a9e4-820b8531b153.filesusr.com/ugd/782be2_e14728beab7c4aa99e4fc414018b44b1.pdf?index=trueIn PDF document text
    • http://juborekif.atwebpages.com/darazifuwerinuwajijokikif.pdfIn PDF document text
    • https://8c56b32b-3398-45d6-9c0b-b55146621f16.filesusr.com/ugd/6924eb_01cef13ea29a4710b29e2882baf0c7f5.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_off0000e326.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE326 5460 bytes
SHA-256: 9e61236d776cab11a7e399b4a86f0c08003a075c9161133c488a95dd14502f76
font_01_sfnt_off0000f5ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5CE 11040 bytes
SHA-256: c149fa559e22f91b589b44472fe2c31b202b8aa23f94d491268b2600074a3f9c

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