Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f98d91f7d76a4a9…

MALICIOUS

PDF

79.5 KB Created: 2021-09-12 06:43:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3e01e55e0544a4d56760d1a7fd37486e SHA-1: 1b49d61c418c8d58affbfda87f65d1846ed65c55 SHA-256: 4f98d91f7d76a4a97bef8ed6f4634fc1aea9ca3f08c6308a123be8ba9a68faa5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. This suggests the primary purpose is to redirect users to potentially harmful content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://meruzhankhachatryan.com/app/webroot/files/file/33277201372.pdf In PDF document text
    • http://vkts.se/userfiles/file/pedixopisofejoj.pdfIn PDF document text
    • https://www.karelo.com/uploads/File/gifiluxirubexofasa.pdfIn PDF document text
    • https://sedefartphotography.com/resimler/files/borinoz.pdfIn PDF document text
    • http://mytrangroup.com/uploads/userfiles/file/73245076007.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/xotatosevateki.pdfIn PDF document text
    • https://bomnuocebara.com/quangbasanpham/app/webroot/upload/image/files/21503790488.pdfIn PDF document text
    • http://www.detskaoptika.cz/ckfinder/userfiles/files/89566646960.pdfIn PDF document text
    • https://lifesmart.ro/ckfinder/userfiles/files/woxiwofilel.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/texomixabakeraretivu.pdfIn PDF document text
    • http://leylasuren.com/images/userfiles/imagefile/julobosuxeluzeziwajunir.pdfIn PDF document text
    • http://cybernet-ap.com/UserFiles/File/47604699616.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/ogm59ji2eqd4kdgch6kaf70fdd/wegaf.pdfIn PDF document text
    • http://geyikkimya.com/userfiles/upload/file/dibijobepaxinonevezaf.pdfIn PDF document text
    • https://imaggu.com/ci/userfiles/files/3125994791.pdfIn PDF document text
    • https://www.vita-organic.eu/admin/ckfinder/userfiles/files/6345707129.pdfIn PDF document text
    • http://smelawservice.com/file_media/file_image/file/darikatevexosup.pdfIn PDF document text
    • http://ildungrice.com/fileupload/fckeditor/file/86374442621.pdfIn PDF document text
    • http://ilkconstruction.com/Images/Media/files/67240078404.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613427f6acafb---61000519085.pdfIn PDF document text
    • https://koncnc.com/genelresimler/file/47371655154.pdfIn PDF document text
    • http://icloudcleaners.com/uploads/account/autoresponderfiles/43801680962.pdfIn PDF document text
    • http://energosol.pl/images_cms/file/fazarukufese.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=how+do+i+remove+cookies+from+my+phonePDF link annotation
    • 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_off0000d2b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eac2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC2 17316 bytes
SHA-256: 65b64a7fd9cdf760bed4a9fbb0a867d5dbddd0ed1c4146f7d0450e233a4eb810
font_02_sfnt_off000117a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117A0 10928 bytes
SHA-256: 2b719f7f7eaac1ff20c978ebd1516671e9de97d03aed840986478f4b63f9c01a

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