Malicious PDF — malware analysis report

Static analysis result for SHA-256 77b268d56943871b…

MALICIOUS

PDF

91.8 KB Created: 2021-09-19 02:34:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: eca92db67397e5ad34855c89eac47c4f SHA-1: b3d467e4ab3a0b90fc67a15671f28cd87b398eca SHA-256: 77b268d56943871b52556830314668b13e3939add6a65e426b68fe8a39c7e923
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to suspicious PDF files on various domains, suggesting a link farm or redirection mechanism. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further indicates a pattern of using disposable hosting for a large number of links, consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 http://www.dean-cpa.com/files/adminpic/file/5493721130.pdf
    • http://www.naturhalles.fr/fckeditor/userfiles/file/newapivanetokumos.pdf
    • http://www.tahi.hu/ckfinder/userfiles/files/13667780699.pdf
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d0e0f0d2eb---nudalavanirovomiluxu.pdf
    • http://strandedtattoo.com/file/18015411307.pdf
    • https://coonvalleycc.com/userfiles/file/fagupo.pdf
    • https://olamare.com/img/uploaded/file/31711187557.pdf
    • http://tao-oita.com/admin/upload_filesfile/kumoj.pdf
    • http://canshu.dlzj.net/upload/files/202109032001235666.pdf
    • https://dispecom.com/cms_dispecom/sgi_userfiles/userfiles/files/bizoxajabizavevugozizudu.pdf
    • http://sunil.kr/uploadfile/fckeditor/file/87293857498.pdf
    • https://moolans.com/uploads/files/46499453459.pdf
    • http://club-integra.ru/userfiles/file/repiminogonaduzozowunaja.pdf
    • https://akapacha.com/userfiles/file/14681678702.pdf
    • https://interno-kazan.ru/upload/files/99906365526.pdf
    • https://lexconsulting.ro/webroot/files/media/jesumisukasu.pdf
    • http://stuarteisbrucklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/538161916.pdf
    • http://willbramephotography.com/89022742531.pdf
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/d4cf612e00463e2aa77a3fd232cb4c33/bozobepijowiduwofuxa.pdf
    • https://goldenlinejsc.com/userfiles/file/42800865235.pdf
    • https://ceccarbotosani.ro/userfiles/file/muwemakodovabegi.pdf
    • https://rimsball.com/ckfinder/userfiles/files/54435673225.pdf
    • http://bulgankhangai.mn/userfiles/files/sowaka.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=android+searchview+hide+keyboard
    • 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_off0000f733.bin
27ec8f8c4cd1e822dda7128c3b264b3dd1af9c4f58f6ff8cc0dba75207d07bee		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF733 21472 bytes
font_01_sfnt_off0001304b.bin
360a78224d0f9afcafa066aaa6b8ea47e2428148e35a01d7880fccb3665af14d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1304B 10804 bytes
font_02_sfnt_off0001493a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1493A 16792 bytes

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