Malicious PDF — malware analysis report

Static analysis result for SHA-256 c50b557c8f586f1a…

MALICIOUS

PDF

117.9 KB Created: 2021-05-21 23:27:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 38bc6431cfbe1ef73229ec8a5cd27210 SHA-1: 0e3964672797178f2ab0ef25a4719fe7045f1b02 SHA-256: c50b557c8f586f1ab1bca83ee36fa232c1b83fe5c8e34c6262bf849a84eaa5a1
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many of which point to potentially malicious domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded URLs are likely used to redirect users to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://druttle.ru/strik?utm_term=unterschied+garmin+lmt-s+und+lmt-d PDF link annotation
    • https://popagupo.weebly.com/uploads/1/3/1/4/131407300/5088053.pdfIn PDF document text
    • https://sekilulijafos.weebly.com/uploads/1/3/1/4/131438177/103fd.pdfIn PDF document text
    • https://sukanoxe.weebly.com/uploads/1/3/1/4/131453950/8ab6bf.pdfIn PDF document text
    • https://sinofokum.weebly.com/uploads/1/3/5/3/135316266/b8161c.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/d643223f-a38f-45b4-8a16-f51970800f61/mivibutanuwevevugume.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4f569db-644a-466f-a46c-7926b2eafad8/ssc_general_math_test_paper.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a09e4be6-d8bc-4267-9531-b9c98b617c29/30567731314.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e278dbd3-dd7a-42d1-a407-e48ec3ff6817/44383334504.pdfIn PDF document text
    • https://s3.amazonaws.com/wolina/nolifebimuz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5df0a20e-edd6-48c6-b64c-717824eedc2d/chefs_choice_diamond_hone_knife_sharpener_instructions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b5ac970-ee7e-48ce-9f15-eaf824318a5a/lujopodigudobivofeselep.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c710cb26-3120-4f4d-9ca9-54154a69183f/nesutenazisatu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/211156c0-db3a-49d9-9250-a16f6d366640/como_convertir_un_archivo_a_word_en_linea_gratis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2caf1161-aee2-4bc2-87e4-507e19c480db/tesla_model_3_new_battery_price.pdfIn PDF document text
    • https://s3.amazonaws.com/zarelusipofox/globo_aerosttico_informacion_en_ingles.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06a714b9-2f2a-4a48-8533-bb0e86447097/soboni.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/52d38b58-f96c-4dca-a4f7-06eeac587c67/razasidiza.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/705adb4c-e378-46c7-b01d-3b5d275c013d/black_ice_cream_cone_for_sale.pdfIn PDF document text
    • https://s3.amazonaws.com/kewakuko/melotola.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/95d4558e-2ce8-4197-a1d9-e53c6fe06dc6/zagixipulugom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1ded48b-145b-4630-9228-f948f9d69412/1440_sports_watch_band.pdfIn PDF document text
    • https://s3.amazonaws.com/ladiwuzetawedi/69535454232.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_off00018e9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18E9C 5376 bytes
SHA-256: ca72f3d67503f383ff6236500a114245f67d3f7034c49b5ca2bb447a123240a0
font_01_sfnt_off0001a0bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A0BF 12340 bytes
SHA-256: 153cd357cf67ffafb7a4f55f1c6fd0e1ae8cdd57323d484856eac4a6e69dc8fe

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