Malicious PDF — malware analysis report

Static analysis result for SHA-256 13dd8666a369e7da…

MALICIOUS

PDF

68.5 KB Created: 2021-09-26 13:13:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c8c60de3a5731c17e0387d9f4c65d0f6 SHA-1: ebd9957cdb0d4e53acd89a7cd13f2d9c727243a0 SHA-256: 13dd8666a369e7da7cf335b0eb2a5433432cc9ddb97cc2da88d88f0fe21b88ad
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many hosted on disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious sites for further compromise. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://garglob.ru/uplcv?utm_term=noka+lite+videos
    • http://ryyw.com/upload/files/2021/09/202109141448476613.pdf
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/9d8154c201c0e8dbd8e43796706d0f4b/pobogoroselijuputipovak.pdf
    • http://erulingua.hu/uploads/content_files/files/33218310324.pdf
    • http://hankyunget.net/userData/board/file/67743766747.pdf
    • http://francescofesta.it/userfiles/files/pirepojoxupijifos.pdf
    • http://finpacecuador.com/userfiles/file/31529799846.pdf
    • http://bjerkelunden.org/content/files/userfiles/file///56889010733.pdf
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210919121000.pdf
    • http://woori-tour.kr/FileData/ckfinder/files/20210924_DD906D0B58605D31.pdf
    • http://xaydunglenguyen.vn/upload/files/c22f8a.pdf
    • http://offerparts.com/upload/files/tubigubasa.pdf
    • https://teamcode.net/upload/files/16724380756.pdf
    • https://kingdomofgodmn.org/userfiles/files/xuxesezuzu.pdf
    • http://klubalfa.org/img/userfiles/file/repuwixakigefudaxexes.pdf
    • http://nhakhoauytinhaiphong.com/upload/files/15631642145.pdf
    • http://musclecar-taps.com/js/upload/files/leburasemu.pdf
    • http://elosc.com/upFile/file///ITX202109212033427364.pdf
    • http://madinagirls.com/easydo%20v2.00/files/uploads/lifumuma.pdf
    • http://kiddeefire.com/media/userfiles/files/naporepiximezolewat.pdf
    • https://podiummagazinenews.com/ckfinder/userfiles/files/kososejovisujuvew.pdf
    • https://98ing.com/upload/ck/files/20210916_032608.pdf
    • http://murielbellhomes.com/userfiles/files/vanafukiliwarasi.pdf
    • http://dent-pro.cz/pic/file/memidonisepebune.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_off0000b00c.bin
a77016fb2f4ab50fdcfea00dc09bcaa650eda2f86427cfadca81b9eede5656e3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB00C 10172 bytes
font_01_sfnt_off0000c6ff.bin
d1f27dd192bc12f7cc1d7584aa6aa146f27051577b9d3b509772e0c57fb813d3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC6FF 14900 bytes
font_02_sfnt_off0000ec66.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC66 16792 bytes

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