Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7f3d22d0ab6928e…

MALICIOUS

PDF

68.7 KB Created: 2020-12-17 14:34:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: e4286a0ef714597d722a2b1e58dd5bd9 SHA-1: d33f8396d47496f07552b84c082ccb12ae07b879 SHA-256: f7f3d22d0ab6928ef95f84ca991eb6e1f1016c7c97860641ef5b8db9d291741f
96 Risk Score

Malware Insights

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

The file is a PDF that contains an embedded URL pointing to a suspicious domain, identified by ClamAV and ML classifiers as malicious. The document body, though heavily obfuscated, suggests a lure related to 'Korean book for beginners pdf'. The presence of an external URI and the overall detection by security tools indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafficel.ru/strik?utm_term=korean+book+for+beginners+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4455376/normal_5fd9148240ada.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387056/normal_5fce941b9b9b9.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/08f2d7e4-dc65-4c98-b461-0f43560d5280/jofezipirolud.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc19923a3bf4b14abae1a5b/t/5fcf7d1814319a51dc33bd2a/1607433500472/tuzupuvekadi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f97acd1c-a42f-4ec6-ab1f-c8039cf53e92/delaware_county_auditor_ohio_dog_tags.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/850f7f25-f1d3-468c-8334-4bfd4afab8af/harry_potter_torrent.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fdfbd4e1-2aa6-45f3-8aaf-13b9fc410e98/xevugasagonuxateviku.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b3ff29f-be35-4785-be74-f8eea151614f/rigozekuniragarirubid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15383ef3-06ce-45bf-b579-a74d033c662b/94370086414.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/180963db-5f58-4898-9b0f-18cfae807643/75507557945.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f07fac3f-ef03-48af-a1e6-faa7b7d8cb4f/xovigola.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ee78c73-1093-4ca0-9204-b0e83f3ed377/drunvalo_melchizedek_flower_of_life.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/94d0a19b-c6c5-4da6-a28e-445ecca51250/1126550751.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4bfa0632-8681-47e0-b0bf-095200fed46c/15823165380.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_off0000cf15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF15 5348 bytes
SHA-256: f8dde05dabec5fcce1ad204cfb63fec6af64e5657e6ae77e523d082dbef9c990
font_01_sfnt_off0000e151.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE151 10644 bytes
SHA-256: 37e0398b42b69edcb133aef8d7741f706755c73a3e680b1bca24ffd6323c6b84

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