Malicious PDF — malware analysis report

Static analysis result for SHA-256 25966b1c7652ae2c…

MALICIOUS

PDF

78.7 KB Created: 2021-09-13 16:29:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 686010f9ee8dd14634b00b4ff02b50e7 SHA-1: d87181d54c8f022d486a031fa9f4459f2063713e SHA-256: 25966b1c7652ae2c0825c922f2f5502ff0a5c0e6df106543eb8d042af66c0db0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many of which point to disposable hosting or link farms, indicating a strong intent to redirect users to potentially harmful sites. The presence of external URIs and the ML classification strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://medvor.ru/uplcv?utm_term=watch+mulan+animation+online
    • http://foto-recepty.sk/images/fotky/lugibiwu.pdf
    • http://toyteepee.com/uploadfiles/file/210907210829061208zkfais.pdf
    • http://wojno-stal.pl/pliki/file/zufog.pdf
    • https://fengshan-zhennangong.org/upload/ckfinder/files/69870393546.pdf
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/a4a68ad5172dba74fd625013d400badf/80697228572.pdf
    • https://ctyhoanongangiang.com/userfiles/file/wutolaf.pdf
    • https://shivajigrihnirman.com/singhania/downloads/file/88572983885.pdf
    • http://files.ibiza-ferien.de/file/73957473337.pdf
    • https://dakhoathienhoa.net/images/files/38026136091.pdf
    • http://restokrat.info/userfiles/file/58703303756.pdf
    • http://www.drivingschool-brno.cz/files/files/37642653095.pdf
    • http://safedoorsystems.com/cmsimages/file/29202803130.pdf
    • http://dobrejaja.com/Upload/file/ferumikesobirujadijisunix.pdf
    • http://zhouzhuanx.com/v15/Upload/file/202193752553026.pdf
    • https://pvcmikser.com/upload/files/fataxe.pdf
    • http://purofirstli.com/userfiles/files/65318542288.pdf
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16132cb9fadcaf---54059183397.pdf
    • http://trungtamsangloc.vn/uploads/ck_upload/files/rubidelefukitow.pdf
    • http://lokalsport.no/userfiles/file/bozukerubijamusuwajabe.pdf
    • http://surestegc.org/documentos/file/69196037810.pdf
    • http://birkhoffhi.com/userfiles/files/sasorerojalurasenuwax.pdf
    • http://newgrids.com/userfiles/file/wagufejib.pdf
    • http://zhodnoceni-penez.cz/is/images/FCKeditor/File/58533176580.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_off0000d00a.bin
20964b792ae36296984e6555a73309774a42d6dbfc5a62713678e1adbe75597f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD00A 17676 bytes
font_01_sfnt_off0000fe46.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE46 16792 bytes
font_02_sfnt_off0001165d.bin
605abf4bfd81e284d5c44279f13f791ee96f70240a071d7c7fbc6454d9607300		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1165D 10320 bytes

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