Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c88e1695762a01a…

MALICIOUS

PDF

99.9 KB Created: 2020-12-08 15:32:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: e0e202b36354d7324916dc700116137e SHA-1: 32a5c061aeeaf8080885eef14069fe94df626407 SHA-256: 2c88e1695762a01ab8dadee7bfcea1f5ad193ead98c6ee749697c7c180d8af33
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains a large number of external links, with one identified as a potential link farm. The primary malicious activity appears to be directing users to external URLs, which could lead to phishing or malware downloads. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafficel.ru/123?utm_term=molecular+phylogenetics+and+evolution+abbreviation PDF link annotation
    • https://giximanuv.weebly.com/uploads/1/3/4/5/134526051/xumisukaxoseb-tatopijuvag.pdfIn PDF document text
    • https://sazejorewisiboj.weebly.com/uploads/1/3/4/4/134459615/rotudarafisi-xetosogedulibe-bamebo-ruridolomukaw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc0d8d024b06a7eb3fedc56/t/5fc3ea5ff81c9a2a0c1ac0d3/1606675045518/73585795441.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc54698085bf90c0e1a01e1/t/5fccc20724c49707d31cce55/1607254537663/knife_hit_hack_all_knife.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5dc63f7cf8c75404cc06f/t/5fcbaa6133fb14715cc05979/1607182946650/34138246346.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/41cdb565-1f08-4aac-a627-f8f243b1f18b/bexibibo.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc102e7bda9c57a97beca32/t/5fc29fd3e18c5c478e51838d/1606590420179/87210520810.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbd0143ec0a1d2b4e565c84/1606222147999/sutuv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88ced677-1d10-4a2b-ac6a-d5a0bc184af4/tepotidupewakugelujazower.pdfIn PDF document text
    • https://s3.amazonaws.com/xiwevitox/how_to_add_footer_to_excel_spreadsheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0791acbb-2ba4-4865-aac8-5a2eeab583ce/25811157318.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/36c4c7c9-7aec-4f39-b61c-808fe735d782/surosonukamijupes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fbce3dbc-d50d-4d94-a862-f43b292ea3bf/direito_penal_parte_especial_esquematizado_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/mupukesunobaga/44346884957.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_off00014888.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14888 5644 bytes
SHA-256: 8fcdf5e529f7a87860a0cbdf06eaafe006e35463b68f623bcf09e30c4a926653
font_01_sfnt_off00015bcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15BCC 11552 bytes
SHA-256: ef2c37e735059c1ac79a104c2a09ae86ce7390ade5786cbf9e985053df94eca6

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