Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6aae918e53d663f…

MALICIOUS

PDF

76.0 KB Created: 2021-09-30 19:53:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 49df06a067f8252c63e38b6777a55755 SHA-1: 19eef16186957248b36e66bc409c8764c976fe79 SHA-256: c6aae918e53d663f355bf94538e8c69b4cda9a702eeb17241c5b02804f97ee46
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic analysis revealed it functions as a link farm, embedding numerous URLs pointing to potentially malicious content. The presence of external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://oniceh.ru/uplcv?utm_term=8th+edition+astra+militarum+codex+pdf PDF link annotation
    • http://pokorny-podlahy.cz/UserFiles/File/1198250365.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1613cd93eb248c---zokivugeroguzumupumen.pdfIn PDF document text
    • http://lemma-studio.pl/userfiles/file/jivogelagevofupamemenetu.pdfIn PDF document text
    • https://bu8m3tas68s-b1.com/contents/files/28313538446.pdfIn PDF document text
    • http://xn--76-6kca8aqc6c.xn--p1ai/pic/userfile/52568019377.pdfIn PDF document text
    • http://shrlie.com/upload_fck/file/2021-9-28/20210928164603557042.pdfIn PDF document text
    • https://www.stock2morrow.com/ckfinder/userfiles/files/82262175430.pdfIn PDF document text
    • https://refakatci.net/userfiles/file/53670794759.pdfIn PDF document text
    • http://rebeccaosborne.com/uploads/81179747866.pdfIn PDF document text
    • http://unewstoday.com/task/userimages/file/48730298717.pdfIn PDF document text
    • https://diamond-marketing.cz/soubory/28986595582.pdfIn PDF document text
    • http://asorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/labegupewasekerafinojiwij.pdfIn PDF document text
    • http://kftchem.com/upload/files/32019681260.pdfIn PDF document text
    • http://seamacros.com/upload/file/61183607752.pdfIn PDF document text
    • http://aromamahabaleshwar.com/ckfinder/userfiles/files/zulevotezeluxunejulafof.pdfIn PDF document text
    • https://inprovitargentina.com/ckfinder/userfiles/files/35513522192.pdfIn PDF document text
    • http://sibzakon.ru/ckfinder/userfiles/files/48203310052.pdfIn PDF document text
    • http://lokalsport.no/userfiles/file/54813245434.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/bfc6544fbbdbcfc5acd372cd14b8626c/bivawexutobafurabeb.pdfIn PDF document text
    • http://gonzagafood.com/userfiles/files/91333902777.pdfIn PDF document text
    • https://cafemocion.com/userfiles/file/filadogugune.pdfIn PDF document text
    • https://shreegroupco.com/userfiles/file/25921199572.pdfIn PDF document text
    • https://absoger.bmv-communication.fr/uploads/files/leselifamirusigafeg.pdfIn PDF document text
    • http://hcpcsz.com/upfolder/e/files/20210928123025.pdfIn PDF document text
    • https://tainandentist.com/uploads/files/202109301145165039.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_off0000c0bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0BC 18264 bytes
SHA-256: 89f08ae30a76a38368e4977058b8be4a783024b3cd3c8959ebd2b55ca982ec08
font_01_sfnt_off0000f019.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF019 11200 bytes
SHA-256: bc016b6f9f5edcb659f0e7df91596e56d3504fb2d29560fd37b35222adba5ee9
font_02_sfnt_off00010a2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A2E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1