Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fe87acf6c6f7e30…

MALICIOUS

PDF

101.7 KB Created: 2021-05-31 23:48:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 019517bf026ef1f1f92e093ef17db748 SHA-1: 8b485a67893c5f1ccd942ec729faa8b67281f9ec SHA-256: 5fe87acf6c6f7e306a9dc4e4280cdae80d5b1b28f4a77d32e059616e4a19a468
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, suggesting a malicious intent to redirect users. The ML classifier and ClamAV detection strongly indicate maliciousness. While no scripts were explicitly extracted, the presence of numerous external URLs, including one that appears to be a tracking or phishing URL, points towards an attempt to lead users to potentially harmful content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://coretry.ru/pbw?utm_term=how+to+calculate+week+by+week+pregnancy PDF link annotation
    • https://vebilikowuti.weebly.com/uploads/1/3/2/7/132740371/9017170f.pdfIn PDF document text
    • https://kofutisidizeb.weebly.com/uploads/1/3/1/4/131437743/kikukifazisusem.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473919/normal_606cb7b845db4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486353/normal_6040d752e2e69.pdfIn PDF document text
    • https://solazipakiku.weebly.com/uploads/1/3/4/5/134509697/accd830df18c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378853/normal_5feebdc5cc493.pdfIn PDF document text
    • https://modotetizifoxi.weebly.com/uploads/1/3/1/6/131637555/samubera-dezibalofilem-lipakosutewazat-niwutexegipano.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448347/normal_603f3e801c312.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417817/normal_5fe795304c447.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383695/normal_6034039169472.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488855/normal_602e1ecfd72ad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491168/normal_602908956e89b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462980/normal_5fff3e44c8071.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470692/normal_5ff906f614e2b.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/621aa4d1-3cda-4ae4-a850-bcc39fff71d7/mircea_eliade_books_list.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6574c942-072a-410b-8ff8-8ddc9657a990/16153003166.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2fe9ba99-06f1-4ded-a359-ae62ab9f9815/math_practice_workbook_grade_2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d5b61e6-d4c4-4927-b27a-a59562d7e04e/tigudalaja.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5a873e2-359d-4210-b939-efea089b5f7a/what_is_nickel_carbonyl.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000122c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122C1 3940 bytes
SHA-256: bbd774f8f4d5080cf35190788557794428171024a4114fd0fa818ad533276766
font_01_sfnt_off000130ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130AB 5284 bytes
SHA-256: 747b3c8d814f9ed8eceb92fdc9a7b1326d8029835c87471974971b07ef2d24e8
font_02_sfnt_off000142cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142CC 14600 bytes
SHA-256: 858c836cab40b1689e20f6da0e1eb5496bf53dcf8bababe0dcfb766f12d4307f
font_03_sfnt_off0001703a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1703A 17096 bytes
SHA-256: 15ee40ee6aebfe803dd583ab2687cc61bd997e972316117f148747591be0eb51

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