Malicious PDF — malware analysis report

Static analysis result for SHA-256 e79276c7fa592aa3…

MALICIOUS

PDF

71.4 KB Created: 2021-10-02 22:58:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 294cc1af972cccda153d9fc25953287b SHA-1: 204f93f467b74d491cf951475a1e2b285b50a3f6 SHA-256: e79276c7fa592aa36ac0322e4359c8ab4cadc591f91567ce696486e081d2d033
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or malware distribution lure. The presence of PDF-specific heuristics like PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://garglob.ru/uplcv?utm_term=the+fast+and+furious+123movies PDF link annotation
    • https://kaxtongroup.com/home5/maxconne/public_html/kaxtongroup/assets/images/newspostimages/files/75657310819.pdfIn PDF document text
    • http://floral-design-lindgens.de/userfiles/file/zumote.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/1127812139.pdfIn PDF document text
    • https://creativitagh.com/pevron/www/img/file/bugawawovezujutubike.pdfIn PDF document text
    • http://altera.ukrstroyka.com/content/xuploadimages/file/lawopikolobifajezep.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/sekumopewugavikojalanime.pdfIn PDF document text
    • http://www.alcera.ca/userfiles/file/tatanefo.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/kamererokemawoge.pdfIn PDF document text
    • https://restavracia02.com/userfiles/file/22681269578.pdfIn PDF document text
    • http://sieuthivatlieuhoanthien.com/upload/files/faxikadoromakutigapin.pdfIn PDF document text
    • http://didongsinhvien.com/upload/files/29857773557.pdfIn PDF document text
    • https://nieruchomosciturystyczne.eu/files/file/25489045489.pdfIn PDF document text
    • http://www.radeton-cz.vasestranky.cz/ckfinder/userfiles/files/19919446828.pdfIn PDF document text
    • https://contabilidadegoncalves.com/fotosempresa/files/fojisuwotomel.pdfIn PDF document text
    • https://bevasilicones.in/userfiles/file/ponuvosije.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/dce9fcb07633ac0eb976e5954ae1f6d0/59132705203.pdfIn PDF document text
    • http://labellebeaute.com.hk/ckfinder/userfiles/files/sefurur.pdfIn PDF document text
    • http://nationalcoopadvisors.com/userfiles/files/sorufipibinuposag.pdfIn PDF document text
    • http://boxerdapolenta.com/cmsimple/images/file/segutafilomabexidemafem.pdfIn PDF document text
    • https://honghow.com/ckfinder/userfiles/files/74772263744.pdfIn PDF document text
    • http://caudafotografia.com/userfiles/files/97096925394.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_off0000af07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF07 11048 bytes
SHA-256: 59665bebf39a7edb2e80a0a69a7a738712b34ce37b62586ad7d1f95ac62c8cbe
font_01_sfnt_off0000c8b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8B0 17920 bytes
SHA-256: 0d5bf6aef3677fce38ddc8783f6d17f3dc8677a51937de0911f53042b1fb6321
font_02_sfnt_off0000f68d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF68D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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