Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bd3d6720d5c0e42…

MALICIOUS

PDF

80.0 KB Created: 2021-03-20 16:22:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: f48c876a33dfa2ed4bd681359cfbf867 SHA-1: 1392f6bb900837ca54f48b1d1e40b4a4178f3757 SHA-256: 3bd3d6720d5c0e42e3140759c673c35d58ffff148be82cf8dba957c97e15e674
164 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://druttle.ru/award?keyword=boats+and+streams+bankers+adda+pdf PDF link annotation
    • https://cdn.sqhk.co/valujoper/9Ghjrig/.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456369/normal_603a5a8573733.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373992/normal_602419b630bc7.pdfIn PDF document text
    • https://cdn.sqhk.co/muvotugi/fhdjagc/dafosuzu.pdfIn PDF document text
    • https://cdn.sqhk.co/tixuniwe/hdgffhb/380017046.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393511/normal_5fccae442dd59.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402280/normal_604504820ce30.pdfIn PDF document text
    • https://cdn.sqhk.co/vekazedivipi/dyehfgf/52284274155.pdfIn PDF document text
    • https://cdn.sqhk.co/levowexesu/tidlthe/35088666984.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469852/normal_6047047d65943.pdfIn PDF document text
    • https://cdn.sqhk.co/seponidozit/Yn8pH35/kewaxitipabipanezepeg.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413567/normal_60047da212046.pdfIn PDF document text
    • https://cdn.sqhk.co/gijosevozu/jgesjib/all_video_downloader_save_social_media_videos.pdfIn PDF document text
    • https://cdn.sqhk.co/peruvereraba/10d6Vjj/vuvugemi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463554/normal_6045eaeb4d1cb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477655/normal_600499e2db822.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403676/normal_5fcdc58d99e61.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5a0de9e-a4e5-4e79-8fb3-0a1b85834a31/brother_serger_1034d_parts.pdfIn PDF document text
    • https://def05634-b969-4265-beeb-1e7d695e9a44.filesusr.com/ugd/6865ce_3652a4a06d0d4d56a2cfaf9beb7024bd.pdf?index=trueIn PDF document text
    • https://05282879-aed3-4f16-ac14-d534add4d4bd.filesusr.com/ugd/0f8b7c_b1482ebfe85c4e50ad99cdd8806d76c4.pdf?index=trueIn PDF document text
    • https://c931c956-7f53-4e4e-96dc-27d7f003ba63.filesusr.com/ugd/b80c10_a804092abdcd4fc08bb136a670778892.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f68c02e8-2631-4c40-aa24-2f019ea57169/epson_workforce_2630_printer_manual.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://scripts.sil.org/OFLIn 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_off0000e05a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE05A 5408 bytes
SHA-256: 7d6ee914f97d2c05cb041db472a73189ff0d698a394203ae3759f4b1eaaade16
font_01_sfnt_off0000f2a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A2 13104 bytes
SHA-256: 22f9656714f0aea6acf04770cd80b3925a4cb8a02a4024a651922495d66d2f48
font_02_sfnt_off00011cfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CFE 16204 bytes
SHA-256: 541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501

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