Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7f1e059e701f446…

MALICIOUS

PDF

87.3 KB Created: 2021-09-17 23:00:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 19f54aecba8cbd322a98b1a45aea3fc4 SHA-1: fed5090f5b84a0748ecb9e55986d1574c2215d88 SHA-256: f7f1e059e701f44680ccf233c849401db63cc79c62fccdf427d18515e78dda1d
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'SE_BROWSER_INSTALL_LURE' strongly suggests a social-engineering attack aimed at tricking the user into installing malicious software or granting unauthorized access. Numerous external URLs were extracted, many pointing to disposable hosting, which are commonly used to host malicious payloads or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://allytemp.ru/uplcv?utm_term=chrome+os+iso+file+64+bit+download PDF link annotation
    • https://gionggiacam.gagiongvitgiong.com/ckfinder/userfiles/files/lakefererakupekonolileror.pdfIn PDF document text
    • http://oipipleszno.pl/userfiles/file/2282038840.pdfIn PDF document text
    • https://myarchitect.es/ckfinder/userfiles/files/57325663618.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130335238af7---dogujoma.pdfIn PDF document text
    • http://www.kowel.com/ckfinder/userfiles/files/1630455888.pdfIn PDF document text
    • https://e-uchebnici.com/img/file/rajibofen.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/rerulikesurapubureja.pdfIn PDF document text
    • https://nnkcreations.com/userfiles/file/16779934404.pdfIn PDF document text
    • http://ilovehikari.com/uploads/files/sopixalofa.pdfIn PDF document text
    • https://ketdoanbus.com/webroot/img/files/butalisefopaxevuduvafu.pdfIn PDF document text
    • http://abwcoliseum.com/uploads/files/46037728124.pdfIn PDF document text
    • http://crescentcarpets.com/userfiles/file/refegodukidowuxezolitap.pdfIn PDF document text
    • http://studiotipaldo.com/userfiles/files/kugosesoxibubolowedizirid.pdfIn PDF document text
    • http://asorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vogediwilajawo.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141df730e9da---8123351515.pdfIn PDF document text
    • http://ericshartman.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wobolijamo.pdfIn PDF document text
    • https://sim2007.com/files/banobuxad.pdfIn PDF document text
    • http://yule-sign.com/upload/editor/file/20210903225035.pdfIn PDF document text
    • http://camonetinternational.com/files/file/42253378582.pdfIn PDF document text
    • http://nakajima-ya.com/upload/save_image/files/womidobirakono.pdfIn PDF document text
    • http://getwealthythisyear.com/ckfinder/userfiles/files/71693440733.pdfIn PDF document text
    • https://systematix.pl/userfiles/file/19863666613.pdfIn PDF document text
    • http://lakesnwoodskerala.com/uploads/file/70274279463.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_off0000ef1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF1D 11124 bytes
SHA-256: 226e5a79a5a2b3d9ed83a008327f43ac2fb95a6742667dcaeef21dddb0cbc15d
font_01_sfnt_off0001090d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1090D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001211f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1211F 17684 bytes
SHA-256: 9f0fb9f99648d054b9a97a135e1a94dab5ec787d221475336bbc80140a030f44