Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c406798ea358601…

MALICIOUS

PDF

82.5 KB Created: 2021-04-05 21:00:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b9d89b0d6c50ec4ea7d268591c9d9e7f SHA-1: bd30334c20700e4522cab368af39fecdb84ce1d3 SHA-256: 5c406798ea358601b2f068fdeab153ce6c937b5a986632751872dc88107ce2d4
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which point to a link farm designed to host other PDF documents. The primary URL suggests a lure related to 'aortic valve disease' to entice users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the PDF structure itself facilitates the redirection.

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://seumenha.ru/award?keyword=aortic+valve+disease+pdf
    • https://cdn.sqhk.co/xibetevoxaj/5BaNhgD/47093510922.pdf
    • https://cdn.sqhk.co/woteruzid/hDjegj5/wulusisalenuta.pdf
    • https://cdn.sqhk.co/niwexifa/z86kgfa/porcupine_facts_sheet.pdf
    • https://cdn.sqhk.co/baxilutifi/jdjfgg4/music_bump_of_chicken_ray.pdf
    • https://cdn.sqhk.co/zesonixiv/m2MiwJz/case_580b_backhoe_parts_manual.pdf
    • https://cdn.sqhk.co/bipuzojafa/Ghirbhg/doon_defence_academy_books.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/ddbedf0e-d62c-40c0-a5c8-240776374e0a/whitney_cummings_the_female_brain_trailer.pdf
    • https://s3.amazonaws.com/pibajuwi/95609426453.pdf
    • https://uploads.strikinglycdn.com/files/a0f4723c-1ed2-4b93-84b8-ff9636007179/dajofodi.pdf
    • https://69a7f268-727d-4112-ba4f-a3538cc856be.filesusr.com/ugd/9a0d60_b8ea83c26e9147f391d91eb766967f07.pdf?index=true
    • https://uploads.strikinglycdn.com/files/d2d395b1-52f9-4ebb-920a-3dde57955916/5237014895.pdf
    • https://s3.amazonaws.com/gavobawum/addition_of_fractions_worksheets_grade_7.pdf
    • https://2aa0b900-127f-4603-a19a-6a731d3c9eb1.filesusr.com/ugd/5eaffa_855cb0a04d1c4821b07e48df2ab35470.pdf?index=true
    • https://4779f2f8-a33e-4327-9c78-21ee0bcf4620.filesusr.com/ugd/31bf02_b40bb39429424ad29fd04fb49b5fdde4.pdf?index=true
    • https://72cee60b-533f-4fda-9f40-87b1bb6f0553.filesusr.com/ugd/590778_40f485cf8a60484487cb15ecb868a912.pdf?index=true
    • https://486bfeb6-87d8-40a3-812f-3449909c9139.filesusr.com/ugd/81b904_2ab68c9f728545529f4e37f3ad99d998.pdf?index=true
    • https://d0fd53c2-66a5-49f7-a942-a4bfc50892a3.filesusr.com/ugd/11baf9_501613e3dbd14d8e9573d89da4170591.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_off0000fa0c.bin
5e16f5e3da9d48e79f5704861455038c2bffb7b9ef67191c7e800c6cc2427b1d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA0C 4880 bytes
font_01_sfnt_off00010abc.bin
8a3431f358411f53ece74298b9aabf00a0defd49dc71c6abfd8d41f7b921cd78		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10ABC 10688 bytes
font_02_sfnt_off00012f1c.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12F1C 4324 bytes

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