Malicious PDF — malware analysis report

Static analysis result for SHA-256 248ff9f2f9276c49…

MALICIOUS

PDF

72.6 KB Created: 2021-09-23 07:56:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2770e907cf283414ed3725db91afdae9 SHA-1: 610dbe172bce0067f546575e77a1cae0892daedd SHA-256: 248ff9f2f9276c49da3ab58651bf7f303a835d9cb46ef3da7c9e8921b83da23c
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, indicating it is designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution through a link farm. The embedded JavaScript is likely responsible for initiating the redirection or further payload execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://drafthe.ru/uplcv?utm_term=sia+diplo+labrinth PDF link annotation
    • http://machulski.com/public/file/53889820137.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef9ce2e2bf---dazadesazegebigomuwomub.pdfIn PDF document text
    • http://iccjsc.com/images/uploads/files/medidutonu.pdfIn PDF document text
    • https://renesens21.com/ressources/upload/files/55158491685.pdfIn PDF document text
    • http://www.phuongdonggolf.vn/app/webroot/uploads/files/memawemurifuses.pdfIn PDF document text
    • http://ornito-silesia.eu/userfiles/file/93073652399.pdfIn PDF document text
    • https://www.liftechforklifts.com.au/application/third_party/ckfinder/userfiles/files/33101739562.pdfIn PDF document text
    • http://gtlitalia.com/userfiles/files/tixanifirojazakubo.pdfIn PDF document text
    • http://constantcontinuity.com/membership/data/files/tetoxogasizepijewibasaboz.pdfIn PDF document text
    • https://10s317.com/uploads/files/202109140406182760.pdfIn PDF document text
    • http://knuhpharm.kr/userfiles/file/20210917110203.pdfIn PDF document text
    • http://gynekolog-zilina.sk/uploads/fck/file/37743782116.pdfIn PDF document text
    • http://tantos.jp/js/upload/files/vavegadabepadawavut.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-9-8/20210908081713776564.pdfIn PDF document text
    • https://multimetrics.com/ckfinder/userfiles/files/18896798616.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1614be30fb6ebe---nelutigakepujiwukuver.pdfIn PDF document text
    • http://alacartedesign.de/userfiles/file/398834399.pdfIn PDF document text
    • http://elfobchod.cz/foto/Image/file/nifuxaxidulizigivuwad.pdfIn PDF document text
    • http://z-i-f.ru/userfiles/file/wopemubozugemewadefemozu.pdfIn PDF document text
    • https://rougezenekar.hu/files/file/27415904244.pdfIn PDF document text
    • https://xn--hjrnskadeakademien-mtb.se/userfiles/file/29879147332.pdfIn PDF document text
    • https://onutglen.com/caningest/images/file/depuwakeji.pdfIn PDF document text
    • http://saxonrt.hu/img/userfiles/files/63368451747.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_off0000ba54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA54 10404 bytes
SHA-256: ada4a0e197dab35fa8175b307d83dd05d891d1d1b4990d33f0cf4952b916ee6f
font_01_sfnt_off0000d172.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD172 16980 bytes
SHA-256: 981d2d6f58287610fd6bc14f5835b10856b841c11fe84873a777c26ed5d19c79
font_02_sfnt_off0000fd5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD5F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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