Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae9b47b0366a0495…

MALICIOUS

PDF

70.3 KB Created: 2021-10-01 16:54:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 28d32ba04d9fc7ad8dba99ea4d761eb1 SHA-1: 9e10d8bdff598bc8789bc51ff9aeb41cccb33dff SHA-256: ae9b47b0366a04958f57eb10e28fb29bf5abc60c4c73ae6f08ab3b2467df5d95
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics indicate the PDF acts as a link farm, directing users to multiple external URLs, one of which is hosted on disposable infrastructure. No scripts were extracted, but the presence of embedded URLs and the nature of the heuristics suggest a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://glozorcom.merlak.ru/userfiles/file/wenepavelepajozikowuwob.pdf In PDF document text
    • https://centaur.vri.cz/docs/files/72019856989.pdfIn PDF document text
    • http://scherzerpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mawanimubuzek.pdfIn PDF document text
    • http://3q1p.com/upload/file/210920074436919626e3dvmudg633n.pdfIn PDF document text
    • http://thessalonikiflights.com/files/files/56402368061.pdfIn PDF document text
    • http://sdtr.mdrap.ro/fckeditor/uploads/file/wafilupasaxawe.pdfIn PDF document text
    • http://phuongdonggolf.vn/app/webroot/uploads/files/xapipitinazedujanuvagagil.pdfIn PDF document text
    • http://azco.friend-match.com/upload/files/munusirijebezuf.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131bdb860b49---25987331835.pdfIn PDF document text
    • http://diamant-x.sk/UserFiles/file/72974768113.pdfIn PDF document text
    • http://www.startservis.sk/novy/ckfinder/userfiles/files/mewuzas.pdfIn PDF document text
    • http://abwrichmond.com/uploads/files/91275467713.pdfIn PDF document text
    • https://skvacations.com/userfiles/file/lulefuxikawuzafu.pdfIn PDF document text
    • http://idevicesplus.nl/app/webroot/files/userfiles/files/28467852120.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613e1d9d81dc0---16916998887.pdfIn PDF document text
    • http://hockeydh.com/files/ups/files/6601618005.pdfIn PDF document text
    • http://shop-cartuning.com/userfiles/file/42777886655.pdfIn PDF document text
    • https://koltoztetes-szallitas-lomtalanitas.excore.hu/ckfinder/userfiles/files/divavozefoludoxusasavepew.pdfIn PDF document text
    • http://sweepinstyle.com/userfiles/file/78097805241.pdfIn PDF document text
    • http://giacongcomposite.com/upload/ck/files/dimupunipomaworoxixe.pdfIn PDF document text
    • https://33mobility.net/uploads/files/jigivomematix.pdfIn PDF document text
    • http://naso10.com/userData/board/file/22177724963.pdfIn PDF document text
    • http://www.parinet.fi/tiedostot/files/20211845779.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/363866d6f6c5596aae46ccea65603eff/54236594910.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=best+offline+space+games+for+androidPDF 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_off0000b311.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB311 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB28 11016 bytes
SHA-256: 4e80079cae8a216f9f024c909a4b4b77ac364df24ec0172c45c2ec01b5221b40
font_02_sfnt_off0000e48b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE48B 15572 bytes
SHA-256: d7c920cee69d1bbdc7138c48421318a02a2808e1429d0981001e1a0a5e418f7e