Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4754cf3fc513320…

MALICIOUS

PDF

76.8 KB Created: 2021-09-30 10:32:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 466046d948a9bdef298b1707fdfd7697 SHA-1: 58e78d1fa9c7d6fc773aeede62f275c3ae759386 SHA-256: f4754cf3fc513320e67d76f4c603f0f1b99ed1edab1a6adde26c354824abe716
126 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. Numerous embedded URLs and a heuristic indicating a link farm on disposable hosting suggest a phishing or credential harvesting attempt. The PDF structure and embedded content, though heavily obfuscated, are consistent with documents designed to redirect users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://crysiq.ru/uplcv?utm_term=extreme+golf+game+cheats PDF link annotation
    • https://olivierdaulte.com/ckfinder/userfiles/files/zowepevev.pdfIn PDF document text
    • https://drproperty.in/userfiles/file/31983758844.pdfIn PDF document text
    • https://quanghuydulich.vn/img_duhoc/files/75863277763.pdfIn PDF document text
    • http://www.moyekolodin.com/files/31053496253.pdfIn PDF document text
    • https://nhatngudongkinh.com/upload/ckupload/files/34250319632.pdfIn PDF document text
    • http://yevres.fr/ckfinder/userfiles/files/84621602563.pdfIn PDF document text
    • http://www.moyekolodin.com/files/87728683374.pdfIn PDF document text
    • http://growlink.biz/userfiles/file/27976650231.pdfIn PDF document text
    • https://taiwan-tiaya.com/upload/tiaya_official/files/gelabebitudedidapilaluxal.pdfIn PDF document text
    • http://gleb777.com/fck_upload/file/1422249660.pdfIn PDF document text
    • http://torremaggiore.sitmap.it/files/files/sezilisowupukateju.pdfIn PDF document text
    • https://broadcasthub.com/ci/userfiles/files/59405524455.pdfIn PDF document text
    • http://hstechno.com/userData/ebizro_board/file/kiwizevagufamut.pdfIn PDF document text
    • http://copingconversations.com/userfiles/file/vibafefibedijikeke.pdfIn PDF document text
    • https://dallaslandscapedesign.com/media/files/12200822520.pdfIn PDF document text
    • http://swaving-stalinrichting.nl/ckfinder/userfiles/files/9701013977.pdfIn PDF document text
    • https://www.lucaslobker.com/minor/ckfinder/userfiles/files/75330121872.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/u6e9q77528vgermg7g5v1m9j8d/24991620019.pdfIn PDF document text
    • http://babywagen24.de/userfiles/file/97967499106.pdfIn PDF document text
    • http://nextlab-semi.com/files/fckeditor/file/siwazi.pdfIn PDF document text
    • https://oolong-dining-co.com/webroot/editor-uploads/files/74967713628.pdfIn PDF document text
    • http://rentappli.com/tinymce/jscripts/tiny_mce/plugins/phpimage/phpimage/upload/images/file/10893882451.pdfIn PDF document text
    • https://intekcanada.com/ckfinder/userfiles/files/81990236032.pdfIn PDF document text
    • http://rotarytattoomachine.co/project-new/christianbook/upload_images/file/rapuwiwelifalazesi.pdfIn PDF document text
    • https://sts-cct.com/app/webroot/userfiles/files/27421669604.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_off0000bff6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFF6 10672 bytes
SHA-256: fa349ffa4ea6c3046a93e089a2623ebfb46639a8f3b5b52737a2f18170d08941
font_01_sfnt_off0000d880.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD880 19680 bytes
SHA-256: 8b6027b2401da27e1dc49dcd5f2732834e164ff3fc80c80e581882c9343b8482
font_02_sfnt_off00010c60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C60 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1