Malicious PDF — malware analysis report

Static analysis result for SHA-256 163056c4f5f489c4…

MALICIOUS

PDF

70.7 KB Created: 2021-10-04 04:49:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: a53a27e0d30f5b8d85f534b842d4aec8 SHA-1: 53971a064cc81833ccd4052c35aa0c20570fc4fb SHA-256: 163056c4f5f489c4400c5afdd381ab5c56ab7682b99356197d687d0c6b48f12b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which are part of a link farm on disposable hosting, suggesting a phishing or redirection scheme. The PDF structure and embedded content are consistent with attempts to lure users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://philabc.ru/uplcv?utm_term=most+sit+ups+in+one+minute PDF link annotation
    • http://cornaredo.gattinonimondodivacanze.it/themes/userfiles/files/doribakupesudel.pdfIn PDF document text
    • https://galedo.cz/www/data/cms_files/files/nuvodozovijazo.pdfIn PDF document text
    • https://csmgh.net/pevron/www/img/file/43126173676.pdfIn PDF document text
    • https://esz.jp/img/editor/files/resupuxafini.pdfIn PDF document text
    • https://immobiliareincentro.it/allegati/file/puduvifefilositofubewiz.pdfIn PDF document text
    • https://securitydm.net/slicice/file/78896246160.pdfIn PDF document text
    • http://archiwum.wyryki.eu/admin/ckfinder/userfiles/files/sijafugiwubojezow.pdfIn PDF document text
    • https://arslanemlak.com/E/file/In PDF document text
    • http://shahnawazonline.com/uploads/files/81567635622.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138197a40a89---gokosasenezitenuxilut.pdfIn PDF document text
    • https://ymy-tea.tw/upload/files/12898705491.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021100114450658.pdfIn PDF document text
    • http://xaydunglenguyen.vn/upload/files/b2a81d.pdfIn PDF document text
    • http://mimarkamilozkartal.com/userfiles/files/kekuxixogamodobiwod.pdfIn PDF document text
    • http://edilgroupdigiovanni.it/userfiles/files/bukifafufasupafofowati.pdfIn PDF document text
    • https://gemma.lucien-sv.info/uploads/files/6153930feb791.pdfIn PDF document text
    • http://stroykap.com/application/views/stroykap/userfiles/file/nudorevulumudubuvalikekog.pdfIn PDF document text
    • http://arisutour.com/ckupload/files/23305368672.pdfIn PDF document text
    • http://donauwell.at/userfiles/file/49988463928.pdfIn PDF document text
    • http://infinity-pro.ru/userfiles/file/befaguvamefenavelor.pdfIn PDF document text
    • http://agapetown.net/ckfinder/userfiles/files/nipoxadulumozomisepuj.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16147d969f11d3---21196512004.pdfIn PDF document text
    • http://studiorapizza.it/userfiles/files/62906302878.pdfIn PDF document text
    • http://sinice-rasy.cz/files/file/40047726319.pdfIn PDF document text
    • http://solarwindependence.com/ckfinder/userfiles/files/22139535617.pdfIn PDF document text
    • http://hockjoohin.com/admin/uploads/file/83400178194.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_off0000b2fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB15 10200 bytes
SHA-256: c998d5fcc0889e0a768f8d36741b23fb5554d2ef56c8ff0cf33b6d894662a5db
font_02_sfnt_off0000e1f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1F6 17092 bytes
SHA-256: 23aac8b84ecdad5927d07cd56894119e30b84a13bc2f00bba6276d8062697a28