Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b4225c0b523c760…

MALICIOUS

PDF

70.9 KB Created: 2021-02-23 02:29:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 8ebb7f2be5ad21108e13b60cd1529e85 SHA-1: b67aa9e4173d63b8667c046d4df6046774a95d77 SHA-256: 9b4225c0b523c76073b992232efcab4ca138479e901a96ed6e780d34078b27ac
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document exhibits characteristics of a link farm, containing numerous external URLs pointing to various hosting services. This technique is commonly used to obscure malicious destinations and distribute phishing lures or malware. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery via these embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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.
  • 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://jottigo.ru/123?utm_term=international+journal+of+research+in+pharmaceutical+sciences+abbreviation PDF link annotation
    • https://cdn.sqhk.co/vofonowul/egjhirQ/36573070034.pdfIn PDF document text
    • https://xefakiradu.weebly.com/uploads/1/3/1/8/131856624/4033934.pdfIn PDF document text
    • https://talegojozafadi.weebly.com/uploads/1/3/2/3/132303005/5fe95a5fc7f.pdfIn PDF document text
    • https://cdn.sqhk.co/metexemoraga/gigj7SX/iphone_words_wallpaper_hd.pdfIn PDF document text
    • https://kuludiliwalu.weebly.com/uploads/1/3/4/4/134484861/9986768.pdfIn PDF document text
    • https://cdn.sqhk.co/nenuguvan/gjhigOL/woden.pdfIn PDF document text
    • https://cdn.sqhk.co/kofisosiz/CMLwhhf/91099993010.pdfIn PDF document text
    • https://kexawugidatenak.weebly.com/uploads/1/3/4/3/134338825/3344787.pdfIn PDF document text
    • https://cdn.sqhk.co/letonolomo/ifjgils/39495989742.pdfIn PDF document text
    • https://nebenumepidenok.weebly.com/uploads/1/3/5/3/135307723/doxoxag-gajuxezujimeg-radibed.pdfIn PDF document text
    • https://wipasokewuwil.weebly.com/uploads/1/3/4/0/134000036/saguk.pdfIn PDF document text
    • http://gratoramaa.space/longman_dictionary_offline_free_for_pcsbesh.pdfIn PDF document text
    • http://securityverifiedservices.com/best_argon_crystal_farmohgd8.pdfIn PDF document text
    • http://hookup750.website/sojemutilemabe03b2z.pdfIn PDF document text
    • https://cdn.sqhk.co/zodavujera/cahdKhe/tezurawapifipelodojadi.pdfIn PDF document text
    • https://letateworu.weebly.com/uploads/1/3/4/3/134365764/zitif.pdfIn PDF document text
    • https://cdn.sqhk.co/teketerep/9Lg0ago/instagram_logo_black_background.pdfIn PDF document text
    • https://cdn.sqhk.co/muribirigim/jOnnhcE/light_up_christmas_garlands_decorations.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c9d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9D2 5348 bytes
SHA-256: 7b8299d3586a9e5f53588c77e53744bd5405edd00e1446842a0f5d42afc05157
font_01_sfnt_off0000dbd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBD7 10608 bytes
SHA-256: 717decdb6023816ee1ae4476c87be4d596a4d9cb5aa8b7f08aef9b62bba8d4c4
font_02_sfnt_off0000ffc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFC8 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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