Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1cf20db4a43d501…

MALICIOUS

PDF

80.9 KB Created: 2021-03-20 14:02:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7756d1dfa7ffb877e89523227aff2f1c SHA-1: 55fbef81e4b39ba4ba4bb622089ef43b16f80fdc SHA-256: a1cf20db4a43d50106e1590017ee4bfe34d5a91fa9175c72dc3287b9bf7151d3
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The presence of a large number of external links, identified as a 'PDF_SEO_LINK_FARM', suggests an attempt to redirect users to potentially harmful websites. While no scripts were explicitly extracted, the PDF structure and link farm indicate a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://kuzutuzo.ru/wix?keyword=wow+vanilla+leatherworking+recipes
    • https://cdn.sqhk.co/soxobiwefili/BjaB9DO/dixie_horn_kit_for_sale.pdf
    • https://cdn.sqhk.co/vopofuxo/F1t4hah/nightclub_story_mod_apk_money.pdf
    • https://cdn.sqhk.co/xafazunusa/9ifDhhS/84406816832.pdf
    • https://cdn.sqhk.co/danuzenanini/wAVjfji/juzerigaxumigedexebonomu.pdf
    • https://cdn.sqhk.co/letarezetap/6hdigjb/calligraphy_fonts_free_marathi.pdf
    • https://static.s123-cdn-static.com/uploads/4383806/normal_6006a61d3df21.pdf
    • https://cdn-cms.f-static.net/uploads/4379969/normal_5fd9937e71b27.pdf
    • https://cdn-cms.f-static.net/uploads/4391954/normal_6033374917495.pdf
    • https://cdn.sqhk.co/miwizawi/UIqEsic/juventus_news_24_twitter.pdf
    • https://cdn.sqhk.co/duzimisese/hivNhc7/spooky_scary_skeletons_sheet_music_french_horn.pdf
    • https://cdn.sqhk.co/tixukiko/d5jignu/58791724393.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/9ec9819b-9218-452d-8dd6-15366662856b/8230029433.pdf
    • https://33fe1336-4051-433c-b691-b763732126dd.filesusr.com/ugd/6c8f37_da9688ceb0c647c19415d6b7e4d987e3.pdf?index=true
    • https://uploads.strikinglycdn.com/files/808667f1-29a8-4d8e-9005-b168bc16a771/xudinabix.pdf
    • https://d525ee04-2a40-494f-8ba9-fee52f7b18ee.filesusr.com/ugd/8b8e24_b8cab118968d407faaeb548ce9468cec.pdf?index=true
    • https://85ed388a-52e0-4e79-9737-9d4b769dda71.filesusr.com/ugd/bb10c5_ed6dc817db3949a19b9e896467dc949a.pdf?index=true
    • https://uploads.strikinglycdn.com/files/c6c897a8-536f-4834-9c1d-5fd2a2c2960c/ihip_elite_bluetooth_headphones_instructions.pdf
    • https://uploads.strikinglycdn.com/files/46411501-f561-408e-8730-775cbe4b8a16/how_much_is_uscis_filing_fees.pdf
    • https://e29f0852-aa8c-4fc4-a5db-fcd144ab7086.filesusr.com/ugd/b730be_1ad04c7c0a6543b7b0c33b45b50ed878.pdf?index=true
    • https://d21da297-2d1c-4020-882f-059d99c29dc9.filesusr.com/ugd/3724a2_d2911fcd9b0f4d2992898ca35991460a.pdf?index=true
    • https://uploads.strikinglycdn.com/files/cc06b0f0-4d15-48e0-9af7-17ad83bcab97/princess_bedtime_stories_to_read_free.pdf
    • https://6bc61794-ec17-45f1-96eb-8bed4cd57308.filesusr.com/ugd/217b8a_4812536868e5485088437192deb1c585.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc6f.bin
c0a4342394e83add6148ae4d2299a5e120e05d427675c2739e85cad5b3bd28c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC6F 5424 bytes
font_01_sfnt_off00010ef6.bin
3dac683d32236a16bff88d9b7474c77b56ca1a48b5727d21c65aa20b42afaa9d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10EF6 11388 bytes

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