Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc80a0ae8b3ef5a1…

MALICIOUS

PDF

75.4 KB Created: 2021-09-14 10:09:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ded98d73c7f26f4bacf2bc92b2a1c3e7 SHA-1: e54a1ab834bf6b39c268bbc3e8f635e4b2797d43 SHA-256: bc80a0ae8b3ef5a17d356bd5c2ad2d521501f70840fcc2bc34e8eb07e62beff8
74 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript, a common technique for executing malicious code or redirecting users. The high number of external URIs, many pointing to disposable domains, suggests a link farm or redirection scheme. The ML classifier strongly indicated maliciousness, supporting the conclusion that this PDF is intended to lead users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132e24beab49---41340580082.pdf In PDF document text
    • https://valubil.com/public/uploads/cms_file/cms_files/61234414878.pdfIn PDF document text
    • https://kueapem.com/contents/files/wexenelujodugifa.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/tatoxakivanevaputabexowe.pdfIn PDF document text
    • http://wsmr.us/userfiles/file/xupujimulan.pdfIn PDF document text
    • http://tantusmarina.com/UserFiles/file/golegeg.pdfIn PDF document text
    • https://mauspro.net/upload/files/tekapifi.pdfIn PDF document text
    • http://proart.by/media/file/kureki.pdfIn PDF document text
    • https://michelbarbot.com/upload/files/bebexiwag.pdfIn PDF document text
    • http://tg-focus.ru/userfiles/files/bajoserimapanajofowa.pdfIn PDF document text
    • http://e68momo.com/shopadmin/upload/files/sedok.pdfIn PDF document text
    • http://preprod.app-nomads.com/ugecam/admin/ckfinder/userfiles/files/73766985019.pdfIn PDF document text
    • http://beerskiboot.de/img/upload/file/tokidajifu.pdfIn PDF document text
    • https://lecachet.fr/docs/files/zikenuwadanipiluzi.pdfIn PDF document text
    • http://nenkin-t.com/upload_img/ck/files/56095626462.pdfIn PDF document text
    • http://svazekobciorlice.cz/userfiles/file/budenedovogajozudu.pdfIn PDF document text
    • http://huthamcauquanggiap.com/upload/files/31069564261.pdfIn PDF document text
    • http://toyotaprius-custom.com/js/upload/files/64811236185.pdfIn PDF document text
    • http://agrobud.net/uploaded/file/89509233506.pdfIn PDF document text
    • https://almuhja.com/ckfinder/userfiles/files/32256436032.pdfIn PDF document text
    • http://mariondhuique-mayer.com/data/file/79237902055.pdfIn PDF document text
    • http://kunjipsc.com/uploads/files/fojixab.pdfIn PDF document text
    • http://sandsflooring.co.uk/ckfinder/userfiles/files/42957948350.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=javascript+filetype+pdfPDF link annotation
    • 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_off0000c3cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3CB 17148 bytes
SHA-256: 5a9a81e31866650f91e72f40b8b49e8e09dd209fbdb5f5d4e3b41b27e018de99
font_01_sfnt_off0000efc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC1 10560 bytes
SHA-256: 7f67bb6fa5560005243fd42840a8b588ce6abcaaa4b2df50dd1d4f7507cfd3cf
font_02_sfnt_off000107f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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