Malicious PDF — malware analysis report

Static analysis result for SHA-256 42a18f5da3758cf2…

MALICIOUS

PDF

71.4 KB Created: 2021-09-28 18:08:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6a4966fdd3f51d709f36d1f3c2f3edf7 SHA-1: 31dfe3d58191f087eab74148772755e36fa46df2 SHA-256: 42a18f5da3758cf2f9090c9684900eced93b99f0fbd55533350bc34ed684f198
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The presence of embedded JavaScript and a high number of external URIs, coupled with a critical ClamAV detection and ML classifier flagging, strongly indicates malicious intent. The PDF appears to function as a lure, redirecting users to potentially harmful content hosted on numerous domains, as evidenced by the extensive list of URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • 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.
  • 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://philabc.ru/uplcv?utm_term=story+saver+for+instagram+assistive
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/88291689243.pdf
    • https://remoteyourstaff.com/calisma2/files/uploads/jetataforofimidexafiwu.pdf
    • http://niktid.ru/userfiles/file/83211376793.pdf
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/041f512e25913bfae23f0c88c8c2b363/xusoxisirudulaxoputilo.pdf
    • https://eventpro-kontraktorpameran.com/uploaded/files/dezufite.pdf
    • http://healingtown.org/userData/board/file/8765495685.pdf
    • http://gesundheit-im-blog.de/userfiles/file/tixivigomeroweda.pdf
    • https://anne-berger.de/sites/anne-berger.de/files/fkcfile/53969007371.pdf
    • https://www.renfrewareahealthvillage.ca/ckfinder/userfiles/files/60368791099.pdf
    • https://alaskaproauto.net/nbloom/fckuploads/file/49313133018.pdf
    • https://gornjastubica.hr/files/63149182102.pdf
    • http://anchor-m.com/js/upload/files/8512189531.pdf
    • http://theblare.com/image/upload/file/webomabugisegabos.pdf
    • http://ukrainski-rosyjski.pl/userfiles/file/dofobomogemisewawevanesa.pdf
    • http://dataprint.ie/uploads/file/julebesasanuboge.pdf
    • http://moveworldtogether.com/datas/files/37482119175.pdf
    • https://interstudy.net/userfiles/file/93490623997.pdf
    • https://akemi.ro/hirek/file/gifinuwiner.pdf
    • http://chelseafoodmart.com/uploads/files/69738851106.pdf
    • http://rickgrisolia.com/userfiles/files/4212541512.pdf
    • http://savalis.ru/userfiles/file/fipijizilagu.pdf
    • https://dnsbp.com/all4help/fckuserfiles/file/41178053466.pdf
    • https://vendax.ro/files/file/81334908954.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_off0000b39d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB39D 16792 bytes
font_01_sfnt_off0000cbaf.bin
94876eca5a458ad19cd7b5b9c3f8ee1383cc8566e482e126f9fc62311c341aea		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCBAF 17028 bytes
font_02_sfnt_off0000f6de.bin
8507c1241a6bdc12de6a46719c18e857477f0daadba3346f9cf1d1a2908bf64e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6DE 10768 bytes

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