Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c538fcb247cd9e0…

MALICIOUS

PDF

76.8 KB Created: 2021-09-14 04:05:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b9bbc8c9c6a63ee6202549abb9ee90f0 SHA-1: 28460e8a77169601145a5fb66338a0a323e81ca2 SHA-256: 8c538fcb247cd9e0b6011ec05902fb6553296e430264cd631204a2d4df6a8340
126 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm. The presence of numerous distinct hosts and disposable domains suggests an attempt to obscure the ultimate destination, likely a phishing site or malware download server. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically points to this behavior.

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://moulindelarroque.com/userfiles/file/49400769467.pdf In PDF document text
    • http://www.siposferenc.hu/html/vosigilapozitimor.pdfIn PDF document text
    • http://naturallabs.fr/userfiles/file/43852753523.pdfIn PDF document text
    • http://rungruangsteel.com/public/upload/userfiles/files/73517397521.pdfIn PDF document text
    • http://vekosgroup.ru/userfiles/file/mutitomevidajogoxijikulav.pdfIn PDF document text
    • http://sensitiva.fi/UserFiles/File/kukolojumase.pdfIn PDF document text
    • http://khocabien.com/uploads/files/zovipixupig.pdfIn PDF document text
    • http://solamsys.com/userData/board/file/20964602945.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613598b939f12---lodoxotafi.pdfIn PDF document text
    • http://branonperformance.com/ckfinder/userfiles/files/63578730558.pdfIn PDF document text
    • http://phubozena.pl/userfiles/file/kusituzikunodeferuna.pdfIn PDF document text
    • http://skkl.cn/filespath/files/20210912201122.pdfIn PDF document text
    • http://duancanhotot.com/upload/files/66916930635.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/684a535d5f1752c3ab0b4c5e8d3e5bb9/19559544535.pdfIn PDF document text
    • http://medicapoland.pl/uploaded/file/lumoridupopinitigogu.pdfIn PDF document text
    • http://freewest.at/dixuzijubojukinuton.pdfIn PDF document text
    • https://kultmotor.hu/images/files/suwabikebuwetolaxalo.pdfIn PDF document text
    • http://www.mattig-accounting.bg/fisiere/file/patasevelufora.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/98082032439.pdfIn PDF document text
    • http://okun.su/upload/file/64995886352.pdfIn PDF document text
    • https://lotusmarinevn.com/upload/files/vunupurozowo.pdfIn PDF document text
    • http://kondicionery-domodedovo.ru/upload_picture/file/nijijipedodanevafaxese.pdfIn PDF document text
    • http://www.medic-pneumolog.ro/fisiere/file/9721324724.pdfIn PDF document text
    • http://dakmoto.cz/obrazky/file/nigewuto.pdfIn PDF document text
    • https://kattliv.com/kattliv/admin/userfiles/file/27889887594.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=extra+lives+mod+apk+downloadPDF link annotation
    • 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_off0000ca18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e22f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE22F 10880 bytes
SHA-256: 4e2e9144ecda586fd089a47a725894602e987fdef73f0916aa284c6f431a8bba
font_02_sfnt_off0000fb5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB5E 16204 bytes
SHA-256: e6ef8dcf480d8349fd44f484e92897edb17fa1c708be8847a73783a210c2b092

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