Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff4612223b909eda…

MALICIOUS

PDF

80.6 KB Created: 2021-09-09 00:20:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 10f3cc16e7fd0d8eb3fc8ed9ce543dee SHA-1: f5d26b815eec257e5cb3bf000bbd2c494d344fe3 SHA-256: ff4612223b909edab2e877f2de7fe696cb1ef39a91ee53009cc6fce3073a9f04
166 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics as malicious, including a link farm on disposable hosting and a password-protected archive lure. The presence of external URIs and embedded URLs suggests an attempt to redirect the user to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://smidgel.ru/uplcv?utm_term=igi+covert+strike+for+android PDF link annotation
    • https://webbsoil.com/home/webb/public_html/ckfinder/userfiles/files/34331185357.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/1c8g5m4nhl6omr95ikt6e8uphi/49026854248.pdfIn PDF document text
    • http://nprofit.hk/userfiles/57877261684.pdfIn PDF document text
    • https://dollarplus98.com/images/upload/files/3298326912.pdfIn PDF document text
    • http://hoadon-dientu.net/images/files/pazod.pdfIn PDF document text
    • http://qazaqbanki.kz/data/content/files/19513788089.pdfIn PDF document text
    • http://metrocars.london/survey/userfiles/files/67552909141.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/mivasoleg.pdfIn PDF document text
    • http://3e3i.com/UserFiles/file///nifujesepusisix.pdfIn PDF document text
    • http://savitaco.com/uploads/images/files/4895184669.pdfIn PDF document text
    • http://aristosaigonhotel.vn/uploads/files/lamivafapezuwemufogajawat.pdfIn PDF document text
    • https://servingltda.com/userfiles/file/mevaxibudupejovewa.pdfIn PDF document text
    • http://etcpremium.com/userfiles/files/58523409385.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16135812a0ffbc---rofopoxivos.pdfIn PDF document text
    • http://capitaldanceacademy.com/userfiles/files/8127066922.pdfIn PDF document text
    • https://learn-atdi.com/uploads/files/55625569737.pdfIn PDF document text
    • http://yalcinsezer.com/upload/ckfinder/files/sixokuju.pdfIn PDF document text
    • https://stealthwindow.tw/uploads/files/202109081702468273.pdfIn PDF document text
    • http://lungshingcentre.com/userfiles/mefenefadusifakesixep.pdfIn PDF document text
    • http://pioneerbuzz.net/userimages/melidotanavadorokexege.pdfIn PDF document text
    • http://speckrepej.com/upload/file/vojurerumudapefuvos.pdfIn PDF document text
    • https://pfollowers.com/ci/userfiles/files/gokafufako.pdfIn PDF document text
    • https://geelaboba.dswip.com/ci/userfiles/files/bubaninafudodafaxopiborag.pdfIn PDF document text
    • https://xosobacninh.vn/webroot/img/files/11742366375.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_off0000d5c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5C8 17736 bytes
SHA-256: 50c4c5803f8de4e69dad8c9f567c1df4bc159c02f88b76d12a54bc79d58463e7
font_01_sfnt_off000103fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103FC 10712 bytes
SHA-256: 5b2fafe0ea79e015ed2d3c771958c0a4a6dcc41c9f02461dc726ce2361cc877a
font_02_sfnt_off00011c9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C9A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1