Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a9a9aca2ec4e1e9…

MALICIOUS

PDF

72.3 KB Created: 2021-09-22 10:00:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c0cbca830429034eefa99fed23418412 SHA-1: 1ea2612ace38ad2f166507c6a71b621c98afd105 SHA-256: 4a9a9aca2ec4e1e9db7d8dcb4b1a60e2623c6e6b5c0678cd2a140632a62eea50
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of numerous embedded URLs suggest the document is designed to redirect users to potentially harmful websites. While no scripts were explicitly extracted, the nature of the embedded links and the overall detection points towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://wastran.ru/uplcv?utm_term=apk+gyroscope+pubg PDF link annotation
    • https://thietbixanh.net/uploads/files/91450089742.pdfIn PDF document text
    • http://tiwtactic.com/userfiles/files/55109300359.pdfIn PDF document text
    • https://ingatlansos.hu/images/userfiles/file/bolurix.pdfIn PDF document text
    • https://www.akilciilacdernegi.com/ckfinder/userfiles/files/nugixotogozalojuwekam.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/62dc805f84b23cfb21bed5a6e3829ff4/somoxakenofojazutex.pdfIn PDF document text
    • http://srilakshmienterprises.net/uploads/peforasobikur.pdfIn PDF document text
    • http://alpinedelhi.com/userfiles/files/desegefalu.pdfIn PDF document text
    • http://mackielaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/2872511723.pdfIn PDF document text
    • http://matras-devison.com/upload/file/20549729698.pdfIn PDF document text
    • http://etoprosto.ru/ckfinder/userfiles/files/92115408906.pdfIn PDF document text
    • https://congchunghadong.com/uploads/files/40059952910.pdfIn PDF document text
    • https://vanphongphamhienluong.com/upload/files/jidopeme.pdfIn PDF document text
    • http://eminenceinc.com/userfiles/file/90167224880.pdfIn PDF document text
    • https://irisapp.cn/uploadfiles/fckeditor/20210910/file/16312065452319.pdfIn PDF document text
    • https://franchiseharbor.com/files/files/tikisasu.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135ceeeafd28---8414348933.pdfIn PDF document text
    • http://artanuji.ge/admin/ckeditor/ckfinder/userfiles/files/xurotejavigefofipimeru.pdfIn PDF document text
    • http://stjconsulting.it/userfiles/files/jegib.pdfIn PDF document text
    • https://hockeymro.ca/docs/file/duwofegoxifusalab.pdfIn PDF document text
    • http://georgewongdesign.com/gwd/upload/files/46728263215.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_off0000ba7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA7B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d292.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD292 10476 bytes
SHA-256: 5a13220df0b0b5322dfaa0967f91b188cc278ac027a20fab9d03ff714e92df72
font_02_sfnt_off0000ea50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA50 16340 bytes
SHA-256: 1a9b109d70413e2b7b81e7255fad70094edd095bacad33ef753828e59b1e335f

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