Malicious PDF — malware analysis report

Static analysis result for SHA-256 fee71f6863c08a5f…

MALICIOUS

PDF

82.1 KB Created: 2021-09-13 23:37:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bb72c0f9c56e93fab9eacf12fad9f5b8 SHA-1: 78d02813313dbef1354f9bbcd76f8eb1b8720041 SHA-256: fee71f6863c08a5f5195d725a74bb292a1a7ecb2a68d8f9eccdec0a8eb24eb62
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are likely used for phishing or distributing further malware. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic and the high number of distinct external URIs strongly suggest a malicious intent to redirect users to potentially harmful sites. ClamAV detection and ML classification further support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://inwebjor.ru/uplcv?utm_term=get+your+free+v+bucks
    • http://architettotamborra.eu/userfiles/files/nowuj.pdf
    • https://turismo-galicia.es/ckfinder/userfiles/files/95527595685.pdf
    • http://ilkconstruction.com/Images/Media/files/lurinowaxolewe.pdf
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613962679f086---81473025872.pdf
    • https://cometsecurity.in/admin/userfiles/file/13999037011.pdf
    • https://gad-elhak.com/userfiles/file/teninisizetim.pdf
    • http://vincentianssjp.com/userfiles/file/92899503580.pdf
    • http://sp2wronki.pl/fotki/fotki/file/76752429492.pdf
    • http://kondicionery-himki.ru/upload_picture/file/35736585352.pdf
    • https://edex.co/userfiles/files/282992852.pdf
    • http://top1np.com/ckfinder/userfiles/files/tiwolotetawomusosilatig.pdf
    • http://architettorobertafasola.eu/userfiles/files/komeletowe.pdf
    • https://zapcdn.space/web/img/podborky/files/98699707784.pdf
    • http://vititanon.com/user_img/files/41149635052.pdf
    • http://fivelscope.net/fckimages/fujogowot.pdf
    • http://kerekesvillszer.hu/UserFiles/file/duzajarupimemubexirezopog.pdf
    • https://pre-www.bridge-college.com/uploaded/ckeditor/files/35462630764.pdf
    • http://soles2walk.com/data/file/75271366613.pdf
    • http://mawaevents.com/uploads/file/53060558909.pdf
    • http://ylpqzl.com/ckfinder/userfiles/files/fevekopegofoludafu.pdf
    • http://kerrya.com/ckfinder/userfiles/files/lasigudojifemurisapojiruz.pdf
    • https://quatden.vn/webroot/img/files/jinaroxawola.pdf
    • http://www.iciparis.ru/ckfinder/userfiles/files/73188821774.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_off0000db77.bin
05a4fd5c3982822bf0401ff9ccf94f865d5fec6c8b4bb59a2e52bf77a9f91608		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB77 10476 bytes
font_01_sfnt_off0000f38d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF38D 16792 bytes
font_02_sfnt_off00010b9f.bin
71dc3ef47d5f2e5f63c5a35a4dde207dcb0e36c0045149ec2b4ab9a4a2414e21		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B9F 18412 bytes

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