Malicious PDF — malware analysis report

Static analysis result for SHA-256 5054a2a6c9a58e5a…

MALICIOUS

PDF

95.1 KB Created: 2021-03-18 09:15:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1a96c2b4cab2eb6fa9dfbd8672def614 SHA-1: 7f83a0434161d8854df8d119c211609af869f723 SHA-256: 5054a2a6c9a58e5af6ba2df4d6bb1ec22f910683ce19ba36adf4dce8d129319f
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one prominent URL leading to a phishing-related domain. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting a link farm or redirection mechanism. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://dafemum.ru/strik?utm_term=a+suitable+boy+netflix+guardian+review
    • http://dikoxikikalonib.scienceontheweb.net/zeratok.pdf
    • https://wevozunivutuk.weebly.com/uploads/1/3/1/4/131484467/ca03635512e56.pdf
    • https://ditoleruv.weebly.com/uploads/1/3/5/3/135345680/3c5eff7c5e2ff5.pdf
    • http://nakijeku.mygamesonline.org/94078182268.pdf
    • http://rujisuki.mygamesonline.org/38712970240.pdf
    • http://budivev.scienceontheweb.net/zubanoporufuzi.pdf
    • http://fukerijinexin.mygamesonline.org/netgear_dgnd3700v2_manuale_italiano.pdf
    • https://bakogala.weebly.com/uploads/1/3/1/3/131384254/5898458.pdf
    • http://galosidijixiwu.mypressonline.com/stroke_volume_and_cardiac_output.pdf
    • http://mopewogubit.getenjoyment.net/toto_katalog.pdf
    • http://jabilevij.mypressonline.com/56259144339.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/bubeto/hair_cutting_pictures_image.pdf
    • https://uploads.strikinglycdn.com/files/74bc0d51-3bc3-489e-9d5c-62a3e2299ad9/dehumidifier_not_collecting_water_uk.pdf
    • https://s3.amazonaws.com/napejaxosinages/funciones_trigonometricas_reciprocas.pdf
    • https://uploads.strikinglycdn.com/files/c5f664f8-bc77-42af-8054-cfcfde7a3e7b/sigikizew.pdf
    • https://uploads.strikinglycdn.com/files/cb367c2f-ecd0-4f9f-bf84-e69dcf85642c/11-22-63_novel_ending.pdf
    • https://s3.amazonaws.com/kuboki/32016999753.pdf
    • https://s3.amazonaws.com/sinadi/howard_miller_grandfather_clock_moving_instructions.pdf
    • https://s3.amazonaws.com/gurafoga/breathable_cotton_bed_sheets.pdf
    • https://s3.amazonaws.com/jejulurowev/35633880849.pdf
    • https://uploads.strikinglycdn.com/files/717c5821-ff91-463b-85f5-89ac43e53666/m50_gas_mask_pouch.pdf
    • https://s3.amazonaws.com/wivunonovef/how_to_review_math_for_the_gre.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_off000134b6.bin
78b8f3152dd17eb2df815d14397b45c618dc35fa6f43e7b3952edebbd870f6da		 pdf-font-stream PDF embedded font (sfnt) at offset 0x134B6 5528 bytes
font_01_sfnt_off000147b9.bin
88910dfa5c5ebf627e2ec81fcbd45a191c825486dbefaf55436b7685dfcc2080		 pdf-font-stream PDF embedded font (sfnt) at offset 0x147B9 11572 bytes

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