Malicious PDF — malware analysis report

Static analysis result for SHA-256 db961062e5f29442…

MALICIOUS

PDF

69.2 KB Created: 2020-11-09 23:24:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 42e94300d32fd9fcd3df65889a6a6f04 SHA-1: 1e6d722839e18dafcc6f6adeeaa7034dd3028647 SHA-256: db961062e5f294422960dbb33c67b1e672cc7d9046500119affed4619dc2ec36
202 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF contains a malicious redirector link and heuristics indicate it uses social engineering to trick the user into installing a browser update or downloading an application. The ML classifier strongly flagged this PDF as malicious, and ClamAV detected it as a phishing trojan. The primary IOC is the malicious redirector URL used in the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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
  • 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://ggtraff.ru/aws?keyword=showbox+app+download+apk+mirror
    • https://cdn-cms.f-static.net/uploads/4372740/normal_5f8ef88f0ee8d.pdf
    • https://cdn-cms.f-static.net/uploads/4368501/normal_5f94d19d942c6.pdf
    • https://cdn-cms.f-static.net/uploads/4368475/normal_5f8fdfe73118e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/xotomisen/tumipezifugimawefanejetaj.pdf
    • https://s3.amazonaws.com/subud/botulismo_fisiopatologia.pdf
    • https://s3.amazonaws.com/pisik/rezugudosete.pdf
    • https://uploads.strikinglycdn.com/files/2df08e68-daa5-4c28-a5f1-64ef032d88e9/10074717918.pdf
    • https://uploads.strikinglycdn.com/files/fd3ff74c-29b4-410d-bf9c-b49ab47812c4/dallas_county_mugshots_2017.pdf
    • https://uploads.strikinglycdn.com/files/278afb0d-dda3-42b8-8e54-25a8e49fb301/41090088158.pdf
    • https://s3.amazonaws.com/dukexajuj/16667862524.pdf
    • https://s3.amazonaws.com/sizadagazagaj/37799814253.pdf
    • https://s3.amazonaws.com/tadovu/chacha_chaudhary_file.pdf
    • https://uploads.strikinglycdn.com/files/fb68d02a-1a6e-415a-8d53-a1d23d09736e/94166494538.pdf
    • https://s3.amazonaws.com/suximawo/48505700437.pdf
    • https://uploads.strikinglycdn.com/files/bb6d5ffb-d467-4df9-abdd-e322c9f05a08/voxagowirojekolisefi.pdf
    • 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_off0000d0f4.bin
1260107304b9a4cffa6f9c3f7e293cf5aacadba8a34b63c9c2faf3e46238d0fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD0F4 5488 bytes
font_01_sfnt_off0000e389.bin
fb6b028297f685f32328dbadc56e64981086a6507d03b588b17d804d6de116a4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE389 10672 bytes

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