Malicious PDF — malware analysis report

Static analysis result for SHA-256 36ee3662adef9459…

MALICIOUS

PDF

81.8 KB Created: 2021-09-12 09:47:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 06f2b24020ef5c642f24572c14550c42 SHA-1: f247f4b1a4152a3c2f958fb52312c6ffc1387151 SHA-256: 36ee3662adef9459cf911df9363f581a65208fe76d935b7d20cea249860208c6
134 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm PDF with a deceptive download button, suggesting a phishing or malware distribution scheme. The presence of numerous external URIs, including one pointing to a potential payload download, reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://pixomot.ru/uplcv?utm_term=play+halo+on+android PDF link annotation
    • https://aljuboori.com/userfiles/files/44058506598.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16135d62b29356---rubegisakavimosomezoto.pdfIn PDF document text
    • https://path.mn/userfiles/files/26182639416.pdfIn PDF document text
    • http://rigosarchitects.gr/userfiles/file/tagaletowikar.pdfIn PDF document text
    • https://pjkconstruction.ca/images/file/4457245723.pdfIn PDF document text
    • http://landpas.pl/upload/file/54433591828.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/nowapisakavin.pdfIn PDF document text
    • https://art-gallery.mn/uploads/files/fafif.pdfIn PDF document text
    • http://sprinter-lab.ru/content/File/17741012795.pdfIn PDF document text
    • https://eccdc.org/application/webroot/userfiles/file/66442255143.pdfIn PDF document text
    • https://mongolia-volkslift.com/uploads/files/tuneb.pdfIn PDF document text
    • http://fapannimario.it/userfiles/files/47379311952.pdfIn PDF document text
    • https://bandotrading.it/uploads/file/vekijabinute.pdfIn PDF document text
    • http://falconfam.com/ckfinder/userfiles/files/46257029521.pdfIn PDF document text
    • http://ldkxzzs.com/images/userfiles/file/nibijerebipod.pdfIn PDF document text
    • https://toyotaautobody.com/ckfinder/userfiles/files/dixavabunorojodoporizoxil.pdfIn PDF document text
    • http://1yunnan.com/ckfinder/userfiles/files/zujikulonovumelokagama.pdfIn PDF document text
    • https://norservis.info/files/files/26631660735.pdfIn PDF document text
    • https://nnt52.ru/userfiles/file/xolilow.pdfIn PDF document text
    • http://ontis.sk/editor_uploads/system/files/nusurot.pdfIn PDF document text
    • http://ddservice-bmw.pl/userfiles/file/5430063436.pdfIn PDF document text
    • http://ambulatorioveterinarioilprato.eu/userfiles/files/fufeleposopi.pdfIn PDF document text
    • http://vipnovini.bg/root/f/uploads/files/8024630024.pdfIn PDF document text
    • http://kutscher-customs.de/gfx/userfiles/files/95727786782.pdfIn PDF document text
    • http://wskinbody.com/data/boardData/files/revozafej.pdfIn PDF document text
    • https://bestcaps99.com/ckfinder/userfiles/files/repusupebatafigepewu.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_off0000dd0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD0B 17908 bytes
SHA-256: 55e5d48190bffc090107f63f9c98d584bf50f1b985b3f326a74299067a4f550d
font_01_sfnt_off00010aed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012304.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12304 10064 bytes
SHA-256: 7110547ebdc34d8d7964530766431bde0d45a6d9c7a0d59cdc16b5f9d79b229c