Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0538b65ae08b3ed…

MALICIOUS

PDF

70.7 KB Created: 2020-11-25 23:42:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: a382d413b128ad8d0f3acb8be3171ad1 SHA-1: bbfd3302db0f4d45d835ed68a01b133a42673b77 SHA-256: f0538b65ae08b3edd0abdc8d03f6cc458aa687c1a9a05008cf221a91ed98f7a3
96 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for an external URI, pointing to a suspicious domain. The document body, though heavily obfuscated, suggests a lure related to statistical parameters. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://traffset.ru/strik?utm_term=definicion+de+parametros+estadisticos PDF link annotation
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/38b606e3-d7b2-46eb-8acc-e7c3ce9f7f9b/serebimixere.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be75b66a-17da-4a29-80fd-5e2193d51291/dsc_1832_installation_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/vibasujefir/95454702622.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/997b5b26-51af-4cb1-b73a-8986105bc06c/dezuwujogoxake.pdfIn PDF document text
    • https://s3.amazonaws.com/ronatiduzoxij/peter_dinklage_destiny_that_wizard_came_from_the_moon.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxadol/pofirowuwifiso.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23d0e524-2a27-4a02-a68b-34ec0b1ee8c2/a_liars_guide_to_rosewood_legendado.pdfIn PDF document text
    • https://s3.amazonaws.com/fogibi/groundsheet_repair_kit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6f3ca2d-f29d-41a8-9200-c756670c96d8/23569582528.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3193d43-1494-49c7-a543-f5fd37c94367/just_walk_on_by_brent_staples_citation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0e7e52a-0dae-4d00-b5f3-e8294e3361c9/30440946707.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d1d7f21-385f-4309-9cc5-7a5cb384dcf4/protoss_carrier_rush.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd5302e8-c112-41f3-bc29-d384f56bf4ec/23471544720.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51c6b90d-c9f5-4c04-8f49-f9d445d444b2/86698669701.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c884dc6-b398-4b9a-8a24-c1e6b6bf106c/1964_chevy_truck_shop_manual.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_off0000d6b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6B7 5268 bytes
SHA-256: d8a7de8915d9807585b0ed57ebb244fb67ec0307527bbad6ce616a6f2d4df157
font_01_sfnt_off0000e898.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE898 10800 bytes
SHA-256: 350a8549b34a2afb96900e3b1a3d7dafc4f6aa60a5896d637fc36bb934db56de

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