Malicious PDF — malware analysis report

Static analysis result for SHA-256 45cfeb3fdb843e69…

MALICIOUS

PDF

66.7 KB Created: 2020-12-07 07:15:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ab47e2f055965a36d580863f13bfca8a SHA-1: 1e28301a372216469b83020657d3811fe9093e50 SHA-256: 45cfeb3fdb843e693774a0542bb1cbe3529f0ce1d65eb615eb77bebf7ebf2f44
164 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ClamAV and an ML classifier, indicating a phishing and trojan distribution attempt. It contains a large number of external links, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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
  • 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://traffset.ru/aws?utm_term=free+fact+sheet+design+template
    • https://cdn-cms.f-static.net/uploads/4376874/normal_5fa0c6675b579.pdf
    • https://nukubejale.weebly.com/uploads/1/3/4/6/134631684/14cb5c923f.pdf
    • https://cdn-cms.f-static.net/uploads/4447089/normal_5fb7f329dc4e9.pdf
    • https://cdn-cms.f-static.net/uploads/4404523/normal_5f9a205247f7b.pdf
    • https://panirosarukiza.weebly.com/uploads/1/3/4/1/134132539/xiromesaf-zoribawotafo-rofadutozura-baforepizazu.pdf
    • https://cdn-cms.f-static.net/uploads/4414153/normal_5fb82c8a1c562.pdf
    • https://cdn-cms.f-static.net/uploads/4378604/normal_5f8bb1dad61c4.pdf
    • https://cdn-cms.f-static.net/uploads/4463528/normal_5fc319b9cf8a9.pdf
    • https://cdn-cms.f-static.net/uploads/4413835/normal_5fb7ce4285bfd.pdf
    • https://cdn-cms.f-static.net/uploads/4415534/normal_5f9cb31ff3fb3.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/ff36ac98-da9f-4e5b-9819-b0db57de779f/how_much_heat_per_second_h_283DqCEB4t_flows_from_the_boiling_water_to_the_ice-water_mixture3F.pdf
    • https://uploads.strikinglycdn.com/files/43780074-22aa-4ae0-a27d-1870f346a55c/13589133234.pdf
    • https://uploads.strikinglycdn.com/files/bf88f703-b771-4392-b662-e0bb66384c2f/how_to_clean_sharper_image_ionic_breeze_quadra_silent_air_purifier.pdf
    • https://uploads.strikinglycdn.com/files/ea139093-ce3a-4c8a-94fd-530d0d82a8af/dm2_digital_music_mixer.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_off0000c7c5.bin
7c4e53b86f3109a00b2bb124a29c47dae8e2ecf0dc9f2960a49e803c5f23cb7b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC7C5 5524 bytes
font_01_sfnt_off0000da68.bin
1da40803d893d26cadc6c5b065f9a601cc9053aa5a46fa79b26511c3f16aff43		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA68 10504 bytes

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