Malicious PDF — malware analysis report

Static analysis result for SHA-256 d07515e30602a6cb…

MALICIOUS

PDF

100.9 KB Created: 2021-09-14 06:50:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: c9df63d7c883aaf0bee9303e960a0e25 SHA-1: 800c92e4f9b11577a22172e8aab8a03cc653e0db SHA-256: d07515e30602a6cbc72263040da0c5ced392df8ae5ea63aa07f8b3c1270318ee
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 0.9711

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://catamma.ru/uplcv?utm_term=sorry+emoji+android PDF link annotation
    • http://arqing.es/ckfinder/userfiles/files/wugipusaxiwok.pdfIn PDF document text
    • https://masterjobintl.com/ckfinder/userfiles/files/80270179707.pdfIn PDF document text
    • https://music-group-store.com/upload/files/51726132933.pdfIn PDF document text
    • http://swapnakoodu.com/fck_uploads/file/52747785106.pdfIn PDF document text
    • https://tasleemdubai.com/userfiles/files/dezixoge.pdfIn PDF document text
    • http://parvazyab.net/basefile/api203/files/4259563300.pdfIn PDF document text
    • http://thietbibepnhahang.net/media/files/liwobivasozega.pdfIn PDF document text
    • http://namkhoabacninh.com/images/files/65332195564.pdfIn PDF document text
    • http://teresachild.com/upload/files/dodowetimejexalawokizuji.pdfIn PDF document text
    • http://3gr-group.com/ci/userfiles/files/sezaf.pdfIn PDF document text
    • http://topenglish.sk/app/webroot/gallery/files/65132176292.pdfIn PDF document text
    • https://maribon.net/app/webroot/files/userfiles/files/parufu.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dd6cc6c485---73685948106.pdfIn PDF document text
    • https://skyzoan.com/cake/beta/userfiles/file/vujapaxonevemejoz.pdfIn PDF document text
    • http://alda.pl/ckfinder/userfiles/files/14359564482.pdfIn PDF document text
    • http://enjoy.sk/editor_uploads/system/files/vatojafusa.pdfIn PDF document text
    • https://evermoral.hk/upload/file/1631001958.pdfIn PDF document text
    • https://thuanxuongmonmb.com/admin/webroot/upload/image/files/tanuj.pdfIn PDF document text
    • https://art-lamps-rali.eu/files/file/xopemetogapavaloxelij.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136fe104c2a1---pixekav.pdfIn PDF document text
    • http://thaoduoconline.com/userfiles/image/file/pipenizaribusomujis.pdfIn PDF document text
    • https://karolinanowak.com/userfiles/file/bijomunaluvififafudem.pdfIn PDF document text
    • http://gruaszarate.com/ckfinder/userfiles/files/38314513054.pdfIn PDF document text
    • http://drprdesaihospital.com/uploads/50316800668.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED24 10416 bytes
SHA-256: 75049ce4e1fd465ad8a26cc8f6416b8fde9704c8bfbc97d2edfa708f9eb69c8f
font_01_sfnt_off000104ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104AB 28144 bytes
SHA-256: 7d3670ecbe173b9f34a816fa9f13c3abbf158878308a17a3d9ae5688d0966a30
font_02_sfnt_off00014bda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BDA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000163e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x163E7 2128 bytes
SHA-256: 45fd20160753fcb570c50de99009296bf1a3b40a8a190baf136400c151df6cf5
font_04_sfnt_off00016d7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16D7F 16748 bytes
SHA-256: 72278f60b884d66d461621bdf3954bf03c191d8e7e6a3fb6f2d45aae36b25c34