Malicious PDF — malware analysis report

Static analysis result for SHA-256 6497130ac0f84e6a…

MALICIOUS

PDF

77.6 KB Created: 2021-09-19 05:03:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5abfa026c1737374e71f5e8fc873648a SHA-1: 94f10f05176db26e56e7a3c87572c189577f0dbf SHA-256: 6497130ac0f84e6a243c9674c1806fadb670d7573a358f58a9ee9cb40d2eabc9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to disposable domains, a common tactic for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates this malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful sites, aligning with spearphishing attachment techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://allytemp.ru/uplcv?utm_term=shapes+for+4th+class PDF link annotation
    • http://tamphuhiep.com/Images_upload/files/41668700545.pdfIn PDF document text
    • https://gruppopolidori.com/upload/image/file/756488925.pdfIn PDF document text
    • https://asiahealthcaredentalcentre.com/ckfinder/userfiles/files/bavobivufexuzebigexu.pdfIn PDF document text
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/48125059024.pdfIn PDF document text
    • http://edmo-cars.nl/images/file/pewuravov.pdfIn PDF document text
    • http://tzoetemondje.be/uploads/files/galakezaz.pdfIn PDF document text
    • https://sheenabusesandcoaches.com/userfiles/file/kowebuvegofekugaxem.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021090800001128.pdfIn PDF document text
    • http://degrossier.nl/uploads/file/jeresudulekux.pdfIn PDF document text
    • https://xenang-mitsubishi.com/fckupload/file/zebobopoxipiwewe.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/576b46054e79fffb04166d861412af1b/kumada.pdfIn PDF document text
    • http://circolonauticofavignana.it/userfiles/files/89330043005.pdfIn PDF document text
    • http://tongchangkj.com/uploadfile/file///2021091304123061.pdfIn PDF document text
    • http://mizuho-co.net/file/ck/files/lidisunobo.pdfIn PDF document text
    • http://www.kigimex.com.vn/ckfinder/userfiles/files/39321567159.pdfIn PDF document text
    • http://hoshitorionline.com/uploads/files/12314153564.pdfIn PDF document text
    • http://sigmabhp.pl/userfiles/file/xesewoz.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/161303c27a1129---41895009382.pdfIn PDF document text
    • http://kristiankutschera.de/userfiles/file/lunenexenixozedivatuzifel.pdfIn PDF document text
    • http://celcg.pl/uploaded/file/19863119507.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c9e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9E0 18204 bytes
SHA-256: c10b3bbeff8c59dbb78dcb0467b30a1e0a8a969ff69a4a45dc92a7fa7a8603f4
font_01_sfnt_off0000f8f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001110d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1110D 10532 bytes
SHA-256: eadcbcff310d3ac7cd17ef16fc35bdb889e5a31eff1b886d85e57fd1f005b95c

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