Malicious PDF — malware analysis report

Static analysis result for SHA-256 5586d1329e9e70aa…

MALICIOUS

PDF

69.2 KB Created: 2021-09-25 20:26:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 2a9e68541eec38f432d586a17d3a17e2 SHA-1: 82a1eefdb2071b8e019605e79f9da89fb78e9f53 SHA-256: 5586d1329e9e70aa94e17fe0537810a24e93848ff7bfdcc820eda7d2bb2d84ff
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains and appear to form a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely responsible for redirecting the user to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 6

  • 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.
  • 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://cructi.ru/uplcv?utm_term=cities+of+the+world+regional+patterns+and+urban+environments+pdf+free PDF link annotation
    • http://nj-rshb.com/v15/Upload/file/20219121452117801.pdfIn PDF document text
    • http://atsolution.org/userfiles/file/20210909072153683758545.pdfIn PDF document text
    • https://mantyobras.com/userfiles/file/jimekivugomakipafoxele.pdfIn PDF document text
    • http://rund-sro.cz/UserFiles/File/71043035430.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613219642d6db---tagavutu.pdfIn PDF document text
    • https://isleo.com/i_photos/file/85001313350.pdfIn PDF document text
    • http://xn--80adib9cjd8a5e.xn--p1ai/i/upload/files/87967193256.pdfIn PDF document text
    • https://hoalavender.net/upload/files/16119465656.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613e909017155---17967359969.pdfIn PDF document text
    • http://saveursetsavoirs.fr/image/file/57813555557.pdfIn PDF document text
    • http://taketty.xyz/js/ckfinder/userfiles/files/ruwufozagerujiripov.pdfIn PDF document text
    • https://smartbrand.ro/mm/file/42095856927.pdfIn PDF document text
    • http://dopuskvsro.ru/UserFiles/89525547314.pdfIn PDF document text
    • http://chrislahoda.ca/userfiles/file/52430936097.pdfIn PDF document text
    • http://g-shocktou.com/user_file/file/pejes.pdfIn PDF document text
    • http://hoangnampte.vn/quangbasanpham/app/webroot/upload/image/files/zuxajaroviziwuzupajetexu.pdfIn PDF document text
    • https://familienbilstrup.dk/userfiles/file/golalowoguna.pdfIn PDF document text
    • http://xn--b1amishc2fb.xn--p1ai/ckfinder/userfiles/files/13742227854.pdfIn PDF document text
    • http://cerritos.songhakbbq.com/uploads/files/lizaneveteg.pdfIn PDF document text
    • https://szalkasszorutacskok.hu/app/webroot/files/content/files/60508266295.pdfIn PDF document text
    • http://tubelessons.net/cms_images/file/botazabemuji.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_off0000aebd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEBD 14920 bytes
SHA-256: 300afb3f9606ef758cfca74498af94214d9342ac1bc7cbac816411ce1a73d3ca
font_01_sfnt_off0000d441.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD441 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ec58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC58 11368 bytes
SHA-256: 1e29c9d7e8a8415971099e62a44103521eec0da27d1539c4befc91e6ed64aac2

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