Malicious PDF — malware analysis report

Static analysis result for SHA-256 b10965deffd2217d…

MALICIOUS

PDF

72.7 KB Created: 2021-11-12 14:53:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: ec2b8dc2b4872d2fa2fef56c79fdc7e8 SHA-1: b84bfa994a1a23f8ffb1389c0225dd7207089e67 SHA-256: b10965deffd2217d5339ad522e9e235ccb821099346e81f9be95f1676ff5b10b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic analysis revealed it functions as a link farm, embedding a large number of external URIs, many of which are on disposable hosting. This suggests the primary purpose is to redirect users to potentially malicious websites, likely for phishing or malware distribution. No scripts were extracted, but the embedded links are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://catamma.ru/uplcv?utm_term=academy+award+for+best+makeup+and+hairstyling PDF link annotation
    • https://endobible.com/userfiles/file/jegavogifurixapu.pdfIn PDF document text
    • https://tekdalyapi.com/upload/ckfinder/files/tenogibufo.pdfIn PDF document text
    • http://kamkmori.cz/ckfinder/userfiles/files/96299722704.pdfIn PDF document text
    • http://stin-verdon.fr/assets/Image/files/fosike.pdfIn PDF document text
    • http://vanguardhungary.hu/userfiles/file/25780392152.pdfIn PDF document text
    • http://ericshartman.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xuroxonatunevuretexifov.pdfIn PDF document text
    • http://alrabbanoilandgas.com/file/files/45008537847.pdfIn PDF document text
    • http://delfosventures.net/userfiles/files/39052678680.pdfIn PDF document text
    • http://kythuatviet.vn/uploads/userfiles/file/92562702924.pdfIn PDF document text
    • http://attlas.center/userfiles/file/75540456605.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/16140be05a1687---84751344897.pdfIn PDF document text
    • https://honghow.com/ckfinder/userfiles/files/91947716935.pdfIn PDF document text
    • https://architektor.ru/uploads/file/83189691996.pdfIn PDF document text
    • http://sor1310.com/userfiles/file/12058829717.pdfIn PDF document text
    • https://tigaintan.com/contents/files/rigozar.pdfIn PDF document text
    • https://mundolibre.cl/uploads/userfiles/files/4621474663.pdfIn PDF document text
    • http://jonme.net/ckupload/files/zajovesapefoxinovofat.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16176e749ce53a---resaletitenaludopelum.pdfIn PDF document text
    • https://traffictkt.com/viking1/uploads/files/76011682539.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/97332960347.pdfIn PDF document text
    • http://8njl.com/userfiles/files/84278579480.pdfIn PDF document text
    • https://juvelyrikoscentras.lt/Files/file/65240025098.pdfIn PDF document text
    • https://sealand-pptc.com/userfiles/file/81869504422.pdfIn PDF document text
    • http://lamekatus.ee/uploads/ckeditor/files/reranuja.pdfIn 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b4e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4E8 11580 bytes
SHA-256: 1c11fd6d30c1dcf25af955468b637f5e1bdd5f461bf5eb72556cf8844536cfef
font_01_sfnt_off0000cfe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFE3 17600 bytes
SHA-256: a30a0c813ba2341c2f5c1e667bd08f20fea46584d566a396f2b96877e0146b10
font_02_sfnt_off0000fdc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC7 16540 bytes
SHA-256: 45015263e28dbf00792e0fa83ae0fb9123af5110209f191c00797c49350166ef

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