Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae43c6cd83bdf471…

MALICIOUS

PDF

79.0 KB Created: 2021-09-09 17:59:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-25
MD5: bf336561e7597db1e44990ab7fd71edb SHA-1: 7e830c963432372c10e1212fa2634ae557e94aec SHA-256: ae43c6cd83bdf47152190bd0b06f8ecc46d4a459b2b9af89c3aea707abea09e0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://pistant.ru/uplcv?utm_term=pdf+midnight+sun+2020 PDF link annotation
    • http://hotelgiottotorino.com/userfiles/files/10733390310.pdfIn PDF document text
    • https://thebookonpersonaltransformation.com/FCKeditor/file/biwumiwugejalisef.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132e6cf2cbaf---nosowimatozogof.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136518285ca5---zibemutugedufano.pdfIn PDF document text
    • http://franceplus.fr/userfiles/file/nitirexejatasivix.pdfIn PDF document text
    • http://itineraire-consulting.com/ckfinder/userfiles/files/xugibuvodelagijusovi.pdfIn PDF document text
    • https://badrivishal.com/media/16091957325.pdfIn PDF document text
    • http://studiotravenzolo.it/userfiles/files/nudimixajugo.pdfIn PDF document text
    • https://shoppingplanet.cityplanet.ro/ckfinder/userfiles/files/58454337733.pdfIn PDF document text
    • http://ttccid.com/userfiles/files/vesusajarakabitola.pdfIn PDF document text
    • http://pokwuttibut.com/file_media/file_image/file/tasigorexebebu.pdfIn PDF document text
    • https://ceccarmaramures.ro/userfiles/file/fekejobivajazaruwuf.pdfIn PDF document text
    • http://www.ciesol.es/ckfinder/userfiles/files/59354799764.pdfIn PDF document text
    • http://intertermo.nl/userfiles/file/97538990148.pdfIn PDF document text
    • http://canxetaidientu.com/images/file/wazaz.pdfIn PDF document text
    • https://binarbaidfabrication.com/public_html/userfiles/file/96043393784.pdfIn PDF document text
    • http://pietroquatriniarchitetto.eu/userfiles/files/4277741288.pdfIn PDF document text
    • http://naoshima-habitant.com/images/blog/file/96039941935.pdfIn PDF document text
    • http://pspectr.ru/userfiles/file/87165632663.pdfIn PDF document text
    • https://aquarell.ro/userfiles/file/kewoxezijitisivobel.pdfIn PDF document text
    • http://kiemdinhcan.com/Images_upload/files/98954988217.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///13491251966.pdfIn PDF document text
    • http://aybar-gallery.com/userfiles/files/jurewazazufap.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_off0000cb3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB3C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e353.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE353 10584 bytes
SHA-256: 853dfd5aef40111129b8ab65a92cf8f5a553df4fc5223dd7309a5f2f8213c3a1
font_02_sfnt_off0000fb1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB1F 19512 bytes
SHA-256: 7ed92602fe80a511af21f9bf4e6b39c8d2935da39799241d9913b8b0da54e586

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