Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef6f9c8c0c1c4aa8…

MALICIOUS

PDF

85.1 KB Created: 2021-09-15 13:53:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e0badb59890d1235a21c753ec4a5f853 SHA-1: f8bd27dafbdf2a41821704189ac41cf18c031ec0 SHA-256: ef6f9c8c0c1c4aa87f97db5108f2fc684e3169a16d22954591adfccd3392088e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of numerous embedded URLs, many pointing to disposable hosting and utilizing UTM parameters, strongly suggests a phishing or malware distribution campaign. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, identifying the document as a link farm designed to obscure its true purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://krisoc.ru/uplcv?utm_term=another+cinderella+story+once+upon+a+song+full+movie+streaming PDF link annotation
    • http://irths.com/upload_files/files/99779588574.pdfIn PDF document text
    • http://agedwedfjtj.pretty-match.com/upload/files/gebogakopofekukosak.pdfIn PDF document text
    • https://momentous-inst.com/uploads/image/files/wajafod.pdfIn PDF document text
    • https://meganimal.pt/site/upload/file/39247986097.pdfIn PDF document text
    • http://kahounova.cz/userfiles/file/89071433737.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141626db2a2e---fidofewenozafominipetezaf.pdfIn PDF document text
    • https://phu-komplex.pl/pliki/file/9035298357.pdfIn PDF document text
    • http://tg-focus.ru/userfiles/files/46904857069.pdfIn PDF document text
    • http://ever-pioneer.com/upload/files/95057999138.pdfIn PDF document text
    • http://pierrevillers.fr/mairie_files/file/fobipipenijesi.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/43739208155.pdfIn PDF document text
    • http://bc-arman.kz/ckfinder/userfiles/files/833556207.pdfIn PDF document text
    • https://istanbulbalbir.com/upload/ckfinder/files/40012550579.pdfIn PDF document text
    • https://narellesastro.com/userfiles/files/musabifilexoxesikolu.pdfIn PDF document text
    • http://imhyuk.com/imhyukeditor/userfile/file/48260157699.pdfIn PDF document text
    • http://dentistturkey.com/image/files/bogofinokowoxigir.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/33497415484.pdfIn PDF document text
    • https://groupunsur4.com/contents/files/7982953608.pdfIn PDF document text
    • http://abwcrainhwy.com/uploads/files/41817979740.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/4b90aadcf6553fc931bec72165026798/witegi.pdfIn PDF document text
    • http://riviera.az/userfiles/file/58001017924.pdfIn PDF document text
    • http://hsaltsj.com/uploads/files/fubusabagabadobabulegi.pdfIn PDF document text
    • http://katachizu.com/img/news/files/10244944772.pdfIn PDF document text
    • http://ktcz.eu/files/files/xomorugitinudafi.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_off0000e3db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3DB 11328 bytes
SHA-256: d7cd82b9789cae9b7ad04c555dedeb3e957f1fc199bc50810886cb5015a80699
font_01_sfnt_off0000fe29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE29 18532 bytes
SHA-256: 0d9584a966ab5335309110342e68e5d15117de0fe648d0cf936c752d235fd51c
font_02_sfnt_off00012e3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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