Malicious PDF — malware analysis report

Static analysis result for SHA-256 311b745504b221cc…

MALICIOUS

PDF

85.4 KB Created: 2021-09-19 16:05:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 498e570235944dfc79bc1dc575b10ab7 SHA-1: 455e584e9341fddc0474d1fbe4e96c84308e95c3 SHA-256: 311b745504b221cc4a34ed58cc525882737e7eeb483a9085cd8f7b030a8895cf
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript and numerous external URIs, many of which point to suspicious or unknown domains. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm designed to obscure the true destination, and the ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection or download of further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://kiptep.ru/file/jorilekuzebijawuzug.pdf In PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/161463140b4e62---zabop.pdfIn PDF document text
    • http://happyorderfood.com/uploads/files/30917870952.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/temoxakosinakususajunig.pdfIn PDF document text
    • https://gazeta-msp.pl/user_files/File/60587380025.pdfIn PDF document text
    • http://wlpp.net/images/blog/file/77400751887.pdfIn PDF document text
    • http://ddaengshop.com/ckupload/files/61739465437.pdfIn PDF document text
    • http://immobilieninvestors.eu/userfiles/file/25501820739.pdfIn PDF document text
    • http://cachnhietwin.com/luutru/files/xotesebexaviku.pdfIn PDF document text
    • http://sonhanint.com/uploadpic/sun/files/202109122301198497.pdfIn PDF document text
    • http://saikunghouse.hk/userfiles/nexome.pdfIn PDF document text
    • http://kammed.com/userfiles/file/71630759094.pdfIn PDF document text
    • https://riosemarescentrodemergulho.com/ckfinder/files/xasinajapaxe.pdfIn PDF document text
    • http://smsalumni1971.com/apadmin/uploads/userfiles/files/rupusakitozebakano.pdfIn PDF document text
    • https://bolahijau.com/contents/files/92547274017.pdfIn PDF document text
    • http://donghobaoan.com/uploads/files/wemapitinivozakegok.pdfIn PDF document text
    • https://supremeroi.com/FCKeditor/file/48802618388.pdfIn PDF document text
    • https://girisimhaber.com/uploads/file/92007669872.pdfIn PDF document text
    • http://iehyun.com/editorupload/file/gawelibotuvimibavomi.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/edca307c636ebd29a9019a608b603e07/rezabepiwowezo.pdfIn PDF document text
    • http://holzbau-napetschnig.at/fogidaledulimer.pdfIn PDF document text
    • http://www.stsmcc.org/www/js/ckfinder/userfiles/files/vijowidoxumumujonuwuwu.pdfIn PDF document text
    • http://mcutech.net/files/51292281634.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=app+torque+pro+androidPDF 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_off0000e995.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE995 18056 bytes
SHA-256: d0ce8154426d28a2d9807efd8a369219ffda347027a533cd9ea7000d8c9cbaac
font_01_sfnt_off0001187c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1187C 10400 bytes
SHA-256: 38d3227a01dba8616b171a3015ac5385410953902f605d89cbeb07b4b56d3f5e
font_02_sfnt_off00012fe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FE6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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