Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6087c8dc81506fe…

MALICIOUS

PDF

80.8 KB Created: 2021-09-09 18:02:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2777e56f7c4f71a0a96dcd6add9fc9d4 SHA-1: 92dbb5f3ae1ca3657a9cdebed26db87109492372 SHA-256: e6087c8dc81506fe8cffb36852d022081ae4db4caaf8ae33b9ce54039b6ad4ac
74 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to a link farm hosted on disposable domains. The ML classifier strongly indicated maliciousness, and the heuristic firings suggest the document is designed to redirect users to a large collection of links, likely for SEO spam or to distribute further malware. No specific family could be identified.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 5

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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=dual+boot+linux+on+windows+10 PDF link annotation
    • http://serramentisiciliano.it/userfiles/files/1970858955.pdfIn PDF document text
    • http://tomgiongvip.com/uploads/files/file/68711497709.pdfIn PDF document text
    • http://ghibms.com/userfiles/files/40956332729.pdfIn PDF document text
    • http://ozcetinler.com/userfiles/file/53077385718.pdfIn PDF document text
    • https://rcvizovice.cz/ckfinder/userfiles/files/6186080001.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/1613983c6dc09c---86945518110.pdfIn PDF document text
    • http://pc580.cn/upload_fck/file/2021-9-5/20210905105236502231.pdfIn PDF document text
    • http://xn--90aoaidn.xn--p1ai/ckfinder/userfiles/files/21363037489.pdfIn PDF document text
    • https://apexsafetyproducts.com/ckfinder/userfiles/files/xojalamutubuvaroxogezuvul.pdfIn PDF document text
    • http://patrick-jardinage.fr/ckfinder/userfiles/files/renexepewozoderozetabiko.pdfIn PDF document text
    • https://curtain.jinware.com/upload/files/31261395222.pdfIn PDF document text
    • https://gastriklandsbf.se/UserFiles/files/72316620349.pdfIn PDF document text
    • https://aarushimukhwas.idealviews.com/userfiles/files/53296896424.pdfIn PDF document text
    • http://secohthailand.com/file_media/file_image/file/57171600594.pdfIn PDF document text
    • https://bhiringisamsankalimandir.org/ckfinder/userfiles/files/newedofemir.pdfIn PDF document text
    • http://daotaoyduoc.org/wp-content/plugins/super-forms/uploads/php/files/921d0ffc8f13de40aef29945f518eaf7/vogoregajeteta.pdfIn PDF document text
    • http://paroissedementon.fr/upload/files/rotitalewu.pdfIn PDF document text
    • https://karolinanowak.com/userfiles/file/nunuzi.pdfIn PDF document text
    • http://quimis.net/js/ckfinder/userfiles/files/walasuwogepivobojumamu.pdfIn PDF document text
    • http://vhshf.de/File/gajumuwiv.pdfIn PDF document text
    • http://cateringkieuan.com/uploads/userfiles/file/98471625192.pdfIn PDF document text
    • http://timeyear-v.com/userfiles/file/wumujumopar.pdfIn PDF document text
    • http://accessibilite-salle-eau.com/ckfinder/userfiles/files/11714911725.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_off0000d67a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD67A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE8C 17780 bytes
SHA-256: c05f2ac7f78493367d562617aff97c09b38821415ab1e3d79914d5b376b62346
font_02_sfnt_off00011d0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D0E 10612 bytes
SHA-256: c6efd3e533327d17eb0b1a19257cf0ee826f2a0d9fed427321cf188533594dac

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