Malicious PDF — malware analysis report

Static analysis result for SHA-256 04269426bc4dc200…

MALICIOUS

PDF

87.8 KB Created: 2021-09-12 06:46:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 63073630062df73c7e176102c80f742c SHA-1: bce8772be65c0a77023371dd197184d61e7c4ee6 SHA-256: 04269426bc4dc20084382c5ab55c56ddd8080b6a4c5c7bda49e737e0cbcfee89
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is flagged as a link farm hosted on disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were directly extracted, the PDF structure and embedded URLs point towards a common tactic of redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://coretry.ru/uplcv?utm_term=creating+android+games+with+unity PDF link annotation
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613af5a22b8d3---faxalalufilibeme.pdfIn PDF document text
    • https://afayl.com/userfiles/file/velegevup.pdfIn PDF document text
    • http://sherwoodonionfestival.com/ckfinder/userfiles/files/relekujavuguzimide.pdfIn PDF document text
    • http://hnkingdee.cn/Files/file/202191014302.pdfIn PDF document text
    • https://ritascreation.com/userfiles/file/dimusuwiwuniku.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/ar94jksk990e4ommlibis82ot7/gilidi.pdfIn PDF document text
    • https://geelaboba.dswip.com/ci/userfiles/files/pajimutogebirowapaxo.pdfIn PDF document text
    • http://maraulsan.com/ckfinder/userfiles/files/37074618193.pdfIn PDF document text
    • http://drumlockingclamp.com/FCK_Editor_Images/files/33957890905.pdfIn PDF document text
    • http://www.texaco.bargiel.com.pl/ckfinder/userfiles/files/61817502294.pdfIn PDF document text
    • http://one9five.com/userfiles/files/xusikawavegeta.pdfIn PDF document text
    • http://arcstema.com/userfiles/files/83436533573.pdfIn PDF document text
    • https://aksukartela.com/images_upload/files/zevujonuvetupebejizudaxum.pdfIn PDF document text
    • http://kaies.net/upfiles/210908074205056619m3xirx.pdfIn PDF document text
    • https://citronel.com/userfiles/files/kojutozemavogefawo.pdfIn PDF document text
    • http://viettelhaiphong.me/data/dulieu/files/retabomuluridum.pdfIn PDF document text
    • https://aokman-drive.com/d/files/seruwufosepesapikani.pdfIn PDF document text
    • https://lalicorne-hotel.com/userfiles/file/6224782888.pdfIn PDF document text
    • https://huuphongplastic.vn/uploads/images/files/3397274848.pdfIn PDF document text
    • http://behtarinekhodetbash.com/files/files/vutuvawimumopevonijo.pdfIn PDF document text
    • http://chonburi33.com/userfiles/file/65054195601.pdfIn PDF document text
    • http://a1climbing.com/userfiles/files/1438462047.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/48111621003.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_off0000f31b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF31B 17756 bytes
SHA-256: 0cbfd0806cb2300ea42b5a63cb6ec822a9eddb62e1b48a8cd5cf2648a1dd4f5b
font_01_sfnt_off000120bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000138d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138D4 10980 bytes
SHA-256: 187428c29e2210e83574f431a56a76817d9fb67e6aee85221d3715272b7a5f37