Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5da9786c1a8998f…

MALICIOUS

PDF

75.9 KB Created: 2021-09-24 10:48:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: d7cd22416f99580f7abda5719ae351c3 SHA-1: 4f87a7fa16b61f1e21f7ad44e974ccd974d038b4 SHA-256: e5da9786c1a8998fb7b12e8d3811e792408e5b288bab2c34b48762f344d99412
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The presence of numerous external URIs, many pointing to disposable hosting and acting as link farms, strongly suggests a phishing or malware distribution campaign. While no scripts were explicitly extracted, the PDF structure and URI patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 5

  • 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.
  • 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://drafthe.ru/uplcv?utm_term=super+mario+free+unblocked PDF link annotation
    • http://turagent007.ru/userfiles/file/lobunebafanituvuwodiv.pdfIn PDF document text
    • http://ahchala.com/img/file/luvufironudotejekibosidu.pdfIn PDF document text
    • https://equalland.com/uploads/File/85229857106.pdfIn PDF document text
    • http://xueyuan.zlyxgw.com/uploads/ckeditor/files/20210917061242.pdfIn PDF document text
    • http://tuclubcr.com/campannas/file/zapadamozolawolixarurik.pdfIn PDF document text
    • http://forumcutuca.com/ckfinder/userfiles/files/tudizov.pdfIn PDF document text
    • http://carrasvilla.es/uploads/files/36349802329.pdfIn PDF document text
    • https://sainaudit.mn/File/73419726252.pdfIn PDF document text
    • https://taucaotoccatba.vn/images/news/files/88244833359.pdfIn PDF document text
    • http://sibzakon.ru/ckfinder/userfiles/files/gixuririxolof.pdfIn PDF document text
    • https://fiscconsulting.com/userfiles/file/wikalodojuloniraw.pdfIn PDF document text
    • http://markasib.ru/ckfinder/userfiles/files/kanaxolinegixejigumav.pdfIn PDF document text
    • http://lumieye.com/userData/ebizro_board/file/nemas.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613caf012ecf2---29296973291.pdfIn PDF document text
    • http://polipack.ru/content/file/zexokusuname.pdfIn PDF document text
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/44794794989.pdfIn PDF document text
    • http://massageindex.nl/images/uploads/39896873477.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/70079292170.pdfIn PDF document text
    • https://classykitchen.pl/web/uploads/files/fewujezufoxob.pdfIn PDF document text
    • http://hibertek.com/image/files/20210914_070927.pdfIn PDF document text
    • http://sipzip.com/userfiles/file/74331854180.pdfIn PDF document text
    • http://nwhouse.ru/uploads/file/9163879705.pdfIn PDF document text
    • http://cosmoscm.com/contents/files/fezosakunireris.pdfIn PDF document text
    • 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_off0000c444.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC444 10924 bytes
SHA-256: ce756f6771b8893a4af4063d3f8a2ca967ae19fdcfcd18245fec8b09c8800ccc
font_01_sfnt_off0000dd42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD42 17244 bytes
SHA-256: 88572fee7b3e9e5253c2317ba494a5aec150445e735ea1164677f0bb8d12069c
font_02_sfnt_off00010a01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A01 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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