Malicious PDF — malware analysis report

Static analysis result for SHA-256 85a8bd440a30d8ac…

MALICIOUS

PDF

74.4 KB Created: 2021-04-29 06:31:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: b5622a62329fe838e8622db903e6cc6a SHA-1: 0840a2586940ec8b6ee03b8f570f6e3bed0e3b1d SHA-256: 85a8bd440a30d8ac897ccb1897d48cc613bb4986b41dd08c9615fa9278ae0f72
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded external links, with one heuristic specifically identifying it as a 'PDF_SEO_LINK_FARM'. The primary external URL points to a suspicious domain, suggesting a phishing or malicious redirection attempt. While no scripts were explicitly extracted, the PDF structure and the presence of numerous links indicate an attempt to direct users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://xajibur.ru/strik?utm_term=what+is+the+best+mini+dv+camcorder+to+buy PDF link annotation
    • https://sutikarojujo.weebly.com/uploads/1/3/4/3/134343437/a197aaee95d28.pdfIn PDF document text
    • https://xozanazefozi.weebly.com/uploads/1/3/0/8/130874019/mamotawelezat_jifujeb_retowexoduk_puvevovobex.pdfIn PDF document text
    • https://mawibunuxipu.weebly.com/uploads/1/3/4/6/134698869/c4d260b4.pdfIn PDF document text
    • https://xofebigile.weebly.com/uploads/1/3/0/7/130739964/dabiwumifuvonozuf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/kudowo/bissell_vacuum_cleaner_parts_south_africa.pdfIn PDF document text
    • https://s3.amazonaws.com/dukavunivifa/ruwulunozed.pdfIn PDF document text
    • https://c8a164a7-2549-4056-b209-d27d417f800b.filesusr.com/ugd/136d3d_04def53a331b483f84194bd312b4c3e3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nelizenejakarug/bokopoxufefulolodosula.pdfIn PDF document text
    • https://s3.amazonaws.com/novipaliwid/selebizegixul.pdfIn PDF document text
    • https://c7fb3737-a2fb-4e06-b71d-f78b648bb0a4.filesusr.com/ugd/a9248e_8fa5ee12c76347c7befbfbbde2ac2392.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/masevewi/poetics_of_architecture_theory_of_design.pdfIn PDF document text
    • https://121f8fc1-d270-4171-a721-8ccd656fc20f.filesusr.com/ugd/2ca22b_71e0e26716874c11ba3a3702f25aae09.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fedojigudaj/hair_clippers_set_argos.pdfIn PDF document text
    • https://0b670cc3-d94b-4117-8b98-7ce677fb6c21.filesusr.com/ugd/7bc559_3ec909a3d0d64d2988cfcfcc90d2665d.pdf?index=trueIn PDF document text
    • https://18cb0a1d-3822-48a5-9ca0-56465202bc9b.filesusr.com/ugd/96564c_a2f14d758537470bac0eda52465d1c93.pdf?index=trueIn PDF document text
    • https://6cda4dd4-8aac-43e7-8003-7c0eea9f7907.filesusr.com/ugd/34e26e_1ec0f1ad72a94bd28e356fbbf8d1d96a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pusolefosex/how_to_learn_computer_code.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_off0000e43f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE43F 5464 bytes
SHA-256: f9a34e2d05de59fda47ad9c7e260198bb7007d00657736515d481f478437112e
font_01_sfnt_off0000f6b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B8 11052 bytes
SHA-256: 11f980b77de40dcc53f0f1b26a7107e92562493b40d2ec273aad313638e3f344

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