Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6aca58d1f59eb88…

MALICIOUS

PDF

74.9 KB Created: 2021-09-25 13:58:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f508b40cdcf73501c6ae18db617bd2e6 SHA-1: 14b8f9a5b3a83f3bf80dfe2bbd4b76c7ffdffb90 SHA-256: b6aca58d1f59eb88ffc90c4555b0115dc38aa54bfe981e500d06c952fc8c3a50
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nomylo.ru/uplcv?utm_term=screenshot+security+policy+android
    • https://12waktu.com/contents/files/11342536981.pdf
    • http://adfaveo.com/image/files/20210920_162837.pdf
    • http://gt-outillages.fr/ressource/site-image/files/vebus.pdf
    • http://goldenstarhotel.vn/images/uploads/files/62488160050.pdf
    • http://studiotecnicodambra.eu/userfiles/files/rixogeki.pdf
    • https://pfhotel.gr/ckfinder/userfiles/files/6178745868.pdf
    • https://ottopianos.nl/files/domesenosutebap.pdf
    • http://driver-jazda.pl/upload/file/bufijekun.pdf
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/48210626481.pdf
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1613b4e618ce5b---91544905774.pdf
    • http://guitarenko.fr/img/files/80483212668.pdf
    • https://marblobaths.com/app/webroot/img/files/wokuvosifewogebuwujig.pdf
    • https://radekslodkiewicz.pl/files/file/2521068328.pdf
    • https://digireg.cz/upload/36741203948.pdf
    • http://zentrumok.com/userfile/files/jeligoroso.pdf
    • https://franchisefarm.franchiseharbor.com/files/files/34761345029.pdf
    • https://creteservices.com/FCKeditor/userimages/file/98966561564.pdf
    • http://xinxinhouseware.com/uploadfile/files/43653189493.pdf
    • http://sanphamhanquocymy.com/uploads/files/83162760594.pdf
    • http://johnmarzillier.com/ckfinder/userfiles/files/jowaz.pdf
    • http://metabolit-plus.ru/files/file/nisajonepidideribavesi.pdf
    • https://vatlieutaphu.com/upload/files/mediruverenijitiluduvit.pdf
    • https://eyetracking.pl/userfiles/file/wapajuvi.pdf
    • http://wxmx.cn/upload/ckimg/files/202109112051533055.pdf
    • https://sardavetri.it/userfiles/file/74518606127.pdf
    • https://bushregenerators.biz/userfiles/files/ramowazizowujogil.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://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_off0000b98f.bin
6097a89073693fcf417eb38bf922dd89c5e80d44876ca97ceeee25ad8d314780		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB98F 10900 bytes
font_01_sfnt_off0000d2b7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD2B7 16792 bytes
font_02_sfnt_off0000eac9.bin
30d26a565b3bc6bf011959d6a69444bc4f5c2354802a2a2f87ecd29087731122		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC9 20084 bytes

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