Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d113ce940d7164d…

MALICIOUS

PDF

72.1 KB Created: 2021-09-27 11:44:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 0cf8193db9bff54a856b0aea0a76deac SHA-1: a7cf19be3d568cc249d46c6cdedbcc07c4c4f9b7 SHA-256: 6d113ce940d7164d10e0f159b8192e93814950d78508fa6387450c0c30917837
166 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document contains numerous embedded URLs, many pointing to unknown or potentially malicious domains, suggesting a phishing or credential harvesting attempt. The presence of 'cmd' in the document text and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic further support the classification as a malicious link farm designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://about-dogs.ru/upload/file/zedogevexigije.pdf In PDF document text
    • http://vnos.vn/app/webroot/uploads/files/485534090.pdfIn macro / runtime command snippet
    • http://vtdsbinhthuan.vn/public/uploads/userfiles/file/femuxanuzikolovotonis.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a737e60397---11510381048.pdfIn PDF document text
    • http://xn--h1aaebajlcgx.xn--p1ai/sadm_files/setovibomuvokopuburapubo.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae77492403---33029115417.pdfIn PDF document text
    • https://stpeterscbs.ca/ckfinder/userfiles/files/83084828904.pdfIn PDF document text
    • http://hotelgiottotorino.com/userfiles/files/38608909420.pdfIn PDF document text
    • http://giaexploring.it/userfiles/files/13449170868.pdfIn PDF document text
    • http://goldenstarhotel.vn/images/uploads/files/fugajo.pdfIn PDF document text
    • http://lonniestireandauto.com/nbloom/fckuploads/file/40243374708.pdfIn PDF document text
    • http://domainecomps.com/documents/files/norip.pdfIn PDF document text
    • http://e-kva.ru/admin/ckfinder/userfiles/files/25039950848.pdfIn PDF document text
    • http://morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/161349d29bb3b4---42075703505.pdfIn PDF document text
    • http://ore-processing.ru/d/files/56642300770.pdfIn PDF document text
    • http://encino.kopanramen.com/uploads/files/zifozilu.pdfIn PDF document text
    • https://ikima.fr/uploads/file/22688336764.pdfIn PDF document text
    • http://ternovykh.ru/content/file/kilasavemevafiputanukoki.pdfIn PDF document text
    • http://carywinslowlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/62199833807.pdfIn PDF document text
    • http://yasaitogo.com/uploads/files/36955112539.pdfIn PDF document text
    • http://quatangsongvan.com/hinhanh_fckeditor/file/9795602480.pdfIn PDF document text
    • http://hanboo.cn/Uploads/file/2021092512164970554.pdfIn PDF document text
    • http://grimastone.ru/files/85723765460.pdfIn PDF document text
    • http://hcstonetw.com/uploads/files/202109020005099268.pdfIn PDF document text
    • http://about-dogs.ru/upIn macro / runtime command snippet
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=hack+wifi+using+cmdPDF 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_off0000b37b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB37B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB8D 18452 bytes
SHA-256: 5f3541c1602e0bc034c8e2af45ef314dc74c8fb5e1eb1da8c89d850eda876e5d
font_02_sfnt_off0000fb51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB51 10592 bytes
SHA-256: f6cda81dca593e563ece5ce3502582a504a21a5c09cc08e23d05fef2fe509e3a