Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6258a41fad0bde6…

MALICIOUS

PDF

77.7 KB Created: 2021-02-13 06:23:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 785f9c77c0da9090997762301584b7d8 SHA-1: bed807d3b4ce8dd48115147c93e33e458013ede2 SHA-256: a6258a41fad0bde658d178174d1b38ce3648db94f201447868a30ebb296c3abc
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing and trojan threat. It impersonates a cloud document service to trick users into clicking external links, such as the one pointing to 'maypoin.ru', which likely leads to a second-stage payload. The presence of numerous external links suggests a link farm designed to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Cloud document impersonation lure medium SE_CLOUD_DOC_LURE
    Document impersonates a cloud file-sharing service such as SharePoint, OneDrive, Google Drive, Dropbox, Box, or Microsoft 365 and asks the user to open, verify, or access a shared document
  • 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://maypoin.ru/wix?keyword=it+chapter+2+google+drive+mp4+free
    • https://cdn.sqhk.co/jevamivuvugi/dhaibPj/84626737656.pdf
    • https://cdn-cms.f-static.net/uploads/4411480/normal_600a0a1af196e.pdf
    • https://cdn-cms.f-static.net/uploads/4453327/normal_5fd7a094b75d7.pdf
    • https://xifisipur.weebly.com/uploads/1/3/1/0/131069870/xezafuwa_padudaditefemig_ropeneg_potujis.pdf
    • https://static.s123-cdn-static.com/uploads/4454824/normal_5ffca462e7654.pdf
    • https://cdn.sqhk.co/woxemumi/nGjgRhd/toca_life_town_apk_ios.pdf
    • https://cdn-cms.f-static.net/uploads/4365608/normal_602716091bbdb.pdf
    • https://cdn-cms.f-static.net/uploads/4463533/normal_5fe9c42644963.pdf
    • https://cdn.sqhk.co/tupizurelir/ehdgvgf/nomujixo.pdf
    • https://static.s123-cdn-static.com/uploads/4476939/normal_6002751972c01.pdf
    • https://cdn.sqhk.co/bitizulokiva/ehedhc9/para_que_sirve_la_pomada_llamada_bamitol.pdf
    • https://cdn.sqhk.co/xejudawadoni/CY4giie/wsdot_cameras_seattle.pdf
    • https://cdn-cms.f-static.net/uploads/4425727/normal_5fd62caf9f73a.pdf
    • https://mugafurevokez.weebly.com/uploads/1/3/4/8/134894013/riloterifowugu.pdf
    • https://cdn.sqhk.co/naxiwakiwuv/yheigic/99128150051.pdf
    • https://static.s123-cdn-static.com/uploads/4484355/normal_5fcbc64a528f4.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2df.bin
83e31a361d79374c5e81dabb9f7ab9296368360814cd9c2b9d25dbe9264cfe88		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2DF 5608 bytes
font_01_sfnt_off000105dc.bin
f18773fbefda4aa75ceaadb09b5855ba7e8aab7025ca0af923ca53de8bbab5e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x105DC 10528 bytes

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