Malicious PDF — malware analysis report

Static analysis result for SHA-256 d99fd7fde55dc4be…

MALICIOUS

PDF

78.9 KB Created: 2021-03-16 18:35:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 36423ddfe9b1bd886002d1f8fc6bf4a5 SHA-1: 9663d25d5ca2ea8e2600ce6b1f1c7a18b16a9988 SHA-256: d99fd7fde55dc4be2d641b17663affacfd4ed9df683e86f01b7982ea6248e32f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating high maliciousness. The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM', pointing to various domains, suggesting an attempt to redirect users to malicious content or phishing sites. The presence of these numerous links and the specific detection names strongly indicate a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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
  • 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://jumiwimov.ru/strik?utm_term=monsieur+ibrahim+und+die+blumen+des+koran+film+netflix
    • http://m-ryanaf.site/navy_seal_copypasta_clean9fypb.pdf
    • https://cdn.sqhk.co/mewivupa/6gfjiIZ/star_traders_4x_empires_elite.pdf
    • http://laura-egorova.ru/992992778767f4un.pdf
    • http://bopolubolef.mywebcommunity.org/breath_of_the_wild_mini_guide_download.pdf
    • https://cdn.sqhk.co/xisofofumew/aQdMggd/mako_mermaids_cast_h20.pdf
    • https://cdn.sqhk.co/kedezoge/xGhegi7/98538692194.pdf
    • https://jinijazi.weebly.com/uploads/1/3/4/6/134668286/36c8779ccd33d.pdf
    • https://cdn.sqhk.co/nolagutotato/hegdSha/warrior_cats_untold_tales_game_download_for_mac.pdf
    • https://cdn.sqhk.co/sebixodof/hgisicb/15854364774.pdf
    • https://tivofexogi.weebly.com/uploads/1/3/1/3/131398075/4153466.pdf
    • http://rosutob.getenjoyment.net/wuwozifusufagaf.pdf
    • http://salonly.xyz/toro_personal_pace_lawn_mower_parts_diagram9hpgj.pdf
    • http://pufivuziviv.mypressonline.com/can_cats_get_aspergers.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/dc521fd3-1643-4cc7-bc69-c5edfdd84903/funegaduboselaz.pdf
    • https://54570836-76ea-4100-b78f-d1ba4c3cc0d1.filesusr.com/ugd/21ac59_03bac704cd844483939a24b33735d2db.pdf?index=true
    • https://uploads.strikinglycdn.com/files/c0bdc084-429c-4ce0-928e-24c1ee74a925/what_comes_with_fl_studio_producer_edition.pdf
    • https://f85e9a30-dbb9-40fd-a66d-53bd7daafe07.filesusr.com/ugd/1b9faa_f72ceef2c0a24cb9b540130b333cac8d.pdf?index=true
    • https://f8b2de7a-6012-4721-b8f1-df5267d6bb95.filesusr.com/ugd/8ebb60_0939ed4327c04d5292271e47d7f8e53a.pdf?index=true
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e593.bin
5d8d15cd4ae43b46be2c62e9ba5e95f0a03fd867915e7c9332027dcbd495a1dd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE593 5308 bytes
font_01_sfnt_off0000f76d.bin
4b27308a16faebe4003cb076c25b965dfe7846b2303b6df53c200f28eae598da		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF76D 12556 bytes
font_02_sfnt_off00012027.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12027 4324 bytes

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