Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c573d06ce75b324…

MALICIOUS

PDF

84.1 KB Created: 2021-03-22 15:25:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 665863dea59ddbbb738a2c38bbdf98fd SHA-1: 72e98e6c10820a74a5495fb99af462e6939bee1a SHA-256: 1c573d06ce75b3247ca86cf1ca62bc7e5e9c26fd99ea1f00af378472883c6c94
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous external links, many of which are to suspicious domains, indicating a phishing or scam attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to redirect users to malicious content or download further malware. No scripts were extracted, but the PDF structure and embedded URLs point to a phishing lure.

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/123?utm_term=rutinas+calistenia+en+casa+pdf
    • https://tegedibinatamam.weebly.com/uploads/1/3/5/3/135350324/lifuwapekadowe_fosekoxavifozi_sumedexak.pdf
    • https://cdn.sqhk.co/lasumalena/iDCgdEX/66297015428.pdf
    • https://static.s123-cdn-static.com/uploads/4443357/normal_60033a2963e69.pdf
    • https://mukeremu.weebly.com/uploads/1/3/4/3/134316251/lobipapi-futikovuwafase.pdf
    • https://cdn.sqhk.co/kivipemo/yUjhOie/kidafodalatariforinoporeb.pdf
    • http://gta-msk.ru/burger_king_hiring_age_14gl7iu.pdf
    • https://cdn.sqhk.co/monubinejon/gehdtRL/arteriografia_femoral.pdf
    • http://getyourcredit.info/rafapukujhjw7d.pdf
    • http://filmera.ru/694948656725xd0o.pdf
    • https://static.s123-cdn-static.com/uploads/4420034/normal_5fcbbe816ed01.pdf
    • https://cdn-cms.f-static.net/uploads/4407983/normal_601f9da0103ae.pdf
    • https://static.s123-cdn-static.com/uploads/4368752/normal_5fefcc6c7af74.pdf
    • https://cdn-cms.f-static.net/uploads/4481820/normal_60328d56ba3eb.pdf
    • https://cdn-cms.f-static.net/uploads/4496597/normal_604cdb54296fe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/cde46ad1-c9ec-41e6-9cd8-f8ef56ae6aa5/23861378293.pdf
    • https://uploads.strikinglycdn.com/files/ff407498-59be-4493-bf8e-b4a0dbd7786a/83831016048.pdf
    • https://uploads.strikinglycdn.com/files/453c2cc9-b44e-4fe0-af31-623cb7a5eaff/how_much_does_a_nc_permit_cost.pdf
    • https://uploads.strikinglycdn.com/files/4539b97b-1ed1-468c-a84f-0c9a9f48c944/nikon_slr_cameras_wiki.pdf
    • https://uploads.strikinglycdn.com/files/76f11b03-3f9a-4056-8f3f-73a6e7b1b942/homelite_14_electric_chainsaw_review.pdf
    • 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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1df.bin
0286a15dc1e05d070dfc417dcfbf60fdb3f8801335706fb8a2f38e931549bca9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1DF 5060 bytes
font_01_sfnt_off00010333.bin
7c80bd6afa07afc83076c55f9cf397de50bb31e903b0c06346e6363860bb335b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10333 12480 bytes
font_02_sfnt_off00012baf.bin
975089639afea594160f6daa1ae948ffc4125994d61a9fd32dce02580f7b6b15		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12BAF 16312 bytes

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