Malicious PDF — malware analysis report

Static analysis result for SHA-256 121ef10b9c66101e…

MALICIOUS

PDF

81.3 KB Created: 2021-09-20 04:51:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1eeb6b989f780bf99d74c4460e88057f SHA-1: 29b85dc004a00dfa030c91ab214c04f6a3af960d SHA-256: 121ef10b9c66101ebe7b49543076fc1ca2253b90822930558c97bfce20997a4c
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF document flagged by multiple heuristics as malicious, including an ML classifier and ClamAV. The 'SE_REMOTE_SUPPORT_LURE' heuristic indicates the document's content likely instructs the user to install or connect to a remote support tool. While no scripts were extracted, the PDF structure and numerous embedded URLs suggest an attempt to trick the user into downloading further malicious content or visiting phishing sites, aligning with a phishing or social engineering attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://abwingsde.com/uploads/files/89363334388.pdf In PDF document text
    • https://avukatwebsitesi.kocgrafik.net/upload/files/39537279610.pdfIn PDF document text
    • https://giaynangchieucao.com/userfiles/file/wofeluwodunabuwefagegak.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/88539985914.pdfIn PDF document text
    • http://eca.or.th/ckfinder/userfiles/files/63618972490.pdfIn PDF document text
    • http://kenshopvn.com/uploads/files/54033967046.pdfIn PDF document text
    • http://nguoiquangphianam.com/uploads/files/faxugizazatovosibex.pdfIn PDF document text
    • http://logiccpacma.com/ckfinder/userfiles/files/kenobavijax.pdfIn PDF document text
    • http://www.anaja-inter.org/public/file/45521529676.pdfIn PDF document text
    • http://feach.ie/images/uploads/file/kukata.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/e1fe93ffe45dff1bebd9524302524a4d/rerumaso.pdfIn PDF document text
    • https://abctranslink.com/ckfinder/userfiles/files/lonebo.pdfIn PDF document text
    • http://progettocecinacuore.it/writable/public/userfiles/file/1843802376.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd85286b5e---garetejuruvofadafat.pdfIn PDF document text
    • http://solarexperte.ch/fckeditor/editor/images/file/nafunug.pdfIn PDF document text
    • http://bettaletroom.com/file_media/file_image/file/galenomusavuli.pdfIn PDF document text
    • https://cursosadistanciayonline.com/medios/files/77435776986.pdfIn PDF document text
    • http://tcsklife.com/filespath/files/20210911212454.pdfIn PDF document text
    • http://unibox.lv/files/text/46540023749.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=the+one+pdf+freePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bceb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCEB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d4fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4FD 21340 bytes
SHA-256: 2b65386894c7ba1a6a1bd6a269bf262ecf08469e0d2019f9fcc673135695afd7
font_02_sfnt_off00010b48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B48 16300 bytes
SHA-256: f204701f64a3b315aa8ad7e6ea4821a882d05167a902e48e8e9f0807979f9d71
font_03_sfnt_off0001218f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1218F 9992 bytes
SHA-256: 472f5e9f855fd2642d1f6db7113e01bec147d643a00965f9c79415b2fdd18a6e

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