Malicious PDF — malware analysis report

Static analysis result for SHA-256 b10ebb269e12249d…

MALICIOUS

PDF

74.5 KB Created: 2021-09-24 20:07:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8cad3a9dad039d939885f45c03fddb24 SHA-1: 31bd35451af7938b4063d4c59bafef945766e503 SHA-256: b10ebb269e12249dc9a0767d1a73c99dd1f9acd24c05055eb68954887e30a747
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 URIs, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or malware distribution lure. The presence of embedded URLs and the nature of the heuristics point towards an attack pattern involving redirection to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=genshin+impact+promo+code+new PDF link annotation
    • https://livstyle.ro/home/livstyle/public_html/uploads/files/24621424288.pdfIn PDF document text
    • http://lustigersteirer.at/userfiles/file/46280495383.pdfIn PDF document text
    • https://farmacieitaliane.com/documenti/file/25335224223.pdfIn PDF document text
    • https://takarasushimn.com/userfiles/files/3685015916.pdfIn PDF document text
    • https://fiscalonline.ro/app/webroot/files/userfiles/files/lizanidig.pdfIn PDF document text
    • http://zhouzhuank.com/v15/Upload/file/20219182347283532.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/7009b9a68497b1c9671c39580a8b9895/43888690474.pdfIn PDF document text
    • http://fcraregistration.com/UploadedData/file/48426721045.pdfIn PDF document text
    • https://hujanuang.com/contents/files/dugalojibone.pdfIn PDF document text
    • http://saraya-shop.ru/upload/files/wisoguzipemerevaporokezu.pdfIn PDF document text
    • http://maydemtienvn.com/upload/files/47334020043.pdfIn PDF document text
    • https://everestart.com/images/stories/file/wuzulirolekupupemidi.pdfIn PDF document text
    • http://accapierre.it/userfiles/files/vagubotasurimutevuriweg.pdfIn PDF document text
    • https://garnizone.com/userfiles/file/kifejifapodotafa.pdfIn PDF document text
    • https://shipnhanh247.vn/asset/files/serexomosokatud.pdfIn PDF document text
    • http://studiodelcorso.eu/userfiles/files/rixabokoweguve.pdfIn PDF document text
    • http://jfhconsultancy.nl/userfiles/files/87138990136.pdfIn PDF document text
    • http://nomayaku.com/userfiles/file/23980215500.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/161404eed9541d---lunuxega.pdfIn PDF document text
    • http://tsradviseurs.nl/mailing/images/photo/file/70089021848.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/ud9hpvhcdehht5aatk9kfs27h7/8975983648.pdfIn PDF document text
    • http://www.yevres.fr/ckfinder/userfiles/files/werovevadirapex.pdfIn PDF document text
    • http://dailycan.com/userfiles/files/26719770592.pdfIn PDF document text
    • https://xn--80ag1a2a.xn--p1ai/files/file/87377299847.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_off0000b8a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8A4 19168 bytes
SHA-256: 21173a25d648ab73868f2f5f2faba9bba5413efbc7a2970865feeaadf5934b1c
font_01_sfnt_off0000ea00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA00 10856 bytes
SHA-256: 5967235caaf3bfee4be5184aed305455cbe87fc531e726e4fd828ebd0d50b897
font_02_sfnt_off000102f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1