Malicious PDF — malware analysis report

Static analysis result for SHA-256 9899286894d9dbf3…

MALICIOUS

PDF

68.7 KB Created: 2021-09-28 09:49:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2d069a25ae0322927870d782471173fd SHA-1: 6a13fc7ed0b1882a06d69149e1614963871c7a4e SHA-256: 9899286894d9dbf3bebab093c6a8e2ffc621430b21b48757c3e09ac8a8d2f9b4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, with heuristics indicating it's a link farm on disposable hosting. The embedded URLs, such as 'https://infrive.ru/uplcv?utm_term=apps+that+hack+android+games', suggest a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and numerous external links point towards an attack pattern involving user redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • 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.
  • 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://infrive.ru/uplcv?utm_term=apps+that+hack+android+games
    • http://liweisteel.co.th/ckfinder/userfiles/files/zakodujuxatojadewew.pdf
    • http://wxbeimei.cn/upload/ckimg/files/202109130105044017.pdf
    • http://netinflux.net/userfiles/file/62831573874.pdf
    • http://proclima-membranes.ru/userfiles/file/29726782996.pdf
    • https://atlantidegattico.it/file/mofotewokogegu.pdf
    • https://webmakler.org/userfiles/file/62729316510.pdf
    • http://chromowane.com/userfiles/file/jejozumij.pdf
    • http://pensionpoint.cz/userfiles/files/20723329544.pdf
    • https://opescom-store.com/uploads/FCK_files/file/55152571156.pdf
    • http://almawred-sy.com/files/adminfiles/files/16334401661.pdf
    • http://minhphucvietnam.com/uploads/userfiles/file/11734789613.pdf
    • https://psfund.org/public/uploads/files/cms_files/roxokes.pdf
    • http://tzsunup.com/upload/34994077825.pdf
    • https://bdblue.com/ckfinder/userfiles/files/pejepimuvixizore.pdf
    • http://natpuedu.in/userfiles/file/97148764828.pdf
    • https://h16hr15k-h19hr37urn.com/contents/files/roreliverojudezex.pdf
    • http://abpjse.news-read.com/upload/files/widelal.pdf
    • http://ingenermarket.ru/userfiles/fuxenogusapoj.pdf
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/jl06qf21fen0oli6hfou0pe0k2/10719830424.pdf
    • http://xinyaoqiye.com/upload_fck/file/2021-9-16/20210916001822974086.pdf
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143c19198a27---ratuporunagabijobigina.pdf
    • http://chi-kara.net/Upload/files/dowaruve.pdf
    • http://konberdbio.com/upload/files/12259403340.pdf
    • http://forestheightsgarden.com/ckupload/files/43490493046.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_off0000ae6f.bin
c1140d4ac858e3b6f7915033da779af78639e42f96b63adae14b3820701be5c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAE6F 14984 bytes
font_01_sfnt_off0000d42a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD42A 16792 bytes
font_02_sfnt_off0000ec41.bin
b3d26be6470544abccee4e722f9810ee775cc02d28573404510003d7ec577b20		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC41 10988 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.