Malicious PDF — malware analysis report

Static analysis result for SHA-256 b663b57d4577120a…

MALICIOUS

PDF

118.7 KB Created: 2021-04-07 00:32:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3cf1384e2fc5abd9f14051924239baca SHA-1: 1345fe63eed8cbf189fee29191be64304837cb62 SHA-256: b663b57d4577120a209b25044d2945b13e612b5df6265d021eee1730cf519290
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 for SEO manipulation or to distribute further malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and numerous external URLs suggest it's designed to lead users to potentially harmful sites or documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://vilenefex.ru/wix?keyword=bandai+millennium+falcon+1%252F144+review
    • http://vizit.store/vagitit5rru2.pdf
    • https://cdn-cms.f-static.net/uploads/4425487/normal_6049f693b5fe0.pdf
    • https://static.s123-cdn-static.com/uploads/4482631/normal_5ff7a8f5a6f30.pdf
    • http://bimadepunepi.mypressonline.com/drugs_in_anaesthesia_and_intensive_care_free_download.pdf
    • https://cdn-cms.f-static.net/uploads/4418783/normal_6039c663c06ae.pdf
    • https://vexinafofonazes.weebly.com/uploads/1/3/1/8/131871992/lapuzetuzorex_savilubixaveko_nepabebiza.pdf
    • https://renudufodajofi.weebly.com/uploads/1/3/4/8/134884992/fuvigolaja_pupek.pdf
    • http://modernstyle.pro/363660580764b6i.pdf
    • https://cdn-cms.f-static.net/uploads/4421352/normal_602f95c6a5267.pdf
    • https://cdn-cms.f-static.net/uploads/4404733/normal_605b7073e5a10.pdf
    • http://raisinsapp.pro/how_to_fix_iron_steam_buttonmf63e.pdf
    • https://sudusiwigi.weebly.com/uploads/1/3/1/0/131069987/daneg.pdf
    • http://kitukotobov.medianewsonline.com/91390826470.pdf
    • https://cdn-cms.f-static.net/uploads/4410191/normal_601c87c426e7f.pdf
    • https://cdn-cms.f-static.net/uploads/4461250/normal_600e8a9c740cb.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://witesenigo.atwebpages.com/case_studies_in_ophthalmology_for_medical_students.pdf
    • https://uploads.strikinglycdn.com/files/04e36d8e-cf56-48b1-8cc4-87d2485e8680/what_is_the_most_common_chord_progression.pdf
    • http://vekejuf.atwebpages.com/factory_reset_compaq_presario_cq57_notebook_pc.pdf
    • https://uploads.strikinglycdn.com/files/46fa1d6f-2f3a-4c24-8b3e-21a65d05c4fb/how_to_connect_skullcandy_indy_fuel.pdf
    • 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_off0001945d.bin
676542b6b5257b5bf7ca6713f0d30c9a91f8362e9ad1d2c3125826b47823cee3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1945D 5368 bytes
font_01_sfnt_off0001a6ad.bin
8e0c062c77df2ef9f9806ba62e792164869d78081451b1a6b4eeaa54e5e805c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1A6AD 11576 bytes

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