Malicious PDF — malware analysis report

Static analysis result for SHA-256 55f57362ccd4eb36…

MALICIOUS

PDF

87.8 KB Created: 2021-09-13 15:43:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0df56c9e38bc300973e97e9ff2a9abe1 SHA-1: 6cbccdf77fe30f9fdadabfd976e8e9d426d49afe SHA-256: 55f57362ccd4eb361581e6655425be4a8ae4c3900e70ea6fdf8160b9e3da1554
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, a common tactic for phishing or distributing further malware. While no scripts were explicitly extracted, the presence of many external URIs points towards an attempt to redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://garglob.ru/uplcv?utm_term=digital+art+in+android
    • https://gites-les-bardots.com/userfiles/file/48215766948.pdf
    • https://proartgaleria.hu/files/files/fefuzuga.pdf
    • http://www.salpasafarit.fi/tiedostot/files/vezosuboxukinabaviduw.pdf
    • http://baby-daycare.com/uploads/files/202109110259364642.pdf
    • http://tolltisztitas.eu/userfiles/files/60093851729.pdf
    • https://ildiko-szepsegszalon.hu/userfiles/file/lekufidupilunekon.pdf
    • https://lensprovn.com/ckfinder/userfiles/files/43499000651.pdf
    • https://imagebrandstudio.com/userfiles/file/sawojigoj.pdf
    • http://cornucopiafrederick.com/uploads/files/sowonakojozuxomatelegu.pdf
    • http://herborgthailand.com/file_media/file_image/file/21077886659.pdf
    • http://gsmontaggi.it/userfiles/files/diwiviresesofakub.pdf
    • https://ymy-tea.tw/upload/files/47611255057.pdf
    • http://guowangcable.com/d/files/xiwemitazapobatig.pdf
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/mirelidi.pdf
    • http://aotwresort.net/ckfinder/userfiles/files/37714965261.pdf
    • http://littlepearlbooks.in/data/eimages/file/nijunelopepofob.pdf
    • https://kingdom.vn/userfiles/file/demawezelowelek.pdf
    • https://mylin.in/ckeditor/ckfinder/userfiles/files/gebuvifudibu.pdf
    • https://imagebrandstudio.com/userfiles/file/mosesofoba.pdf
    • http://mashhadgardi724.ir/basefile/mashhadgardi724/files/90055842486.pdf
    • https://kalashad.com/userfiles/file/gimatifuwuvid.pdf
    • https://ka-base.no/images_content/file/tutetefopanilaki.pdf
    • http://novo-foto.ru/ckfinder/userfiles/files/52978975739.pdf
    • https://liepasmuiza.lv/userfiles/library/36610255712.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_off0000f491.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF491 16792 bytes
font_01_sfnt_off00010ca8.bin
fee10a355a28a0770fb33715d6607cb68bc3ed8de7e03396c6b8ea67b8f0e3dd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA8 10124 bytes
font_02_sfnt_off0001230f.bin
20e072a2da52f0ef4e8eb4fea9ee622a592b586094642dc7c3e8bdad66630da6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1230F 17932 bytes

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