Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8db2ef9014b6a69…

MALICIOUS

PDF

80.5 KB Created: 2021-09-14 12:14:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: cbba2de3cfe161a5759ff1a93eff7c9f SHA-1: 2edbd98c07ccdfeb9861e3322a52bf3dbf873ecf SHA-256: a8db2ef9014b6a69c64759c815161fa5593e914c160d648d53f23aef8aa607af
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs, many of which are part of a link farm hosted on disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious lure designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://allytemp.ru/uplcv?utm_term=play+store+free+install PDF link annotation
    • http://dmkert.hu/files/file/64274210087.pdfIn PDF document text
    • https://sammycar.ch/sammy/sites/default/sammyfiles/newsletterfile/16951826813.pdfIn PDF document text
    • https://www.zochrot.org/ckfinder/userfiles/files/59515338758.pdfIn PDF document text
    • http://travel-door.com/userfiles/file/87373213497.pdfIn PDF document text
    • http://mebelhotel.ru/userfiles/files/91531561646.pdfIn PDF document text
    • http://ominocoibaffi.it/userfiles/files/figakobedemubami.pdfIn PDF document text
    • http://naosgym.com/userfiles/files/91785931486.pdfIn PDF document text
    • http://praguetransfer.com/files/file/pepinorivafubejow.pdfIn PDF document text
    • http://splhardware.com/UploadFile/file/2021090322134273499.pdfIn PDF document text
    • http://worthingtonpark101.com/userimages/riwuzud.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/161327e06a1acd---1944028806.pdfIn PDF document text
    • http://napiarsaigh.com/images/xejulat.pdfIn PDF document text
    • http://zxpgw.com/userfiles/file/43776289298.pdfIn PDF document text
    • http://www.vljainandco.com/userfiles/files/pezukafi.pdfIn PDF document text
    • http://antonio-pelella.eu/userfiles/files/xusaxel.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/kiderewotedulukopamatibeb.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/vemekavaripoviwesiwaxamob.pdfIn PDF document text
    • http://hcstonetw.com/uploads/files/202109121843076723.pdfIn PDF document text
    • http://mlead.net/images/e/file/zirukaraj.pdfIn PDF document text
    • http://komputerzagrosze.pl/userfiles/file/77343766325.pdfIn PDF document text
    • https://www.potravinyav21.cz/ckfinder/userfiles/files/50900000432.pdfIn PDF document text
    • http://emke.hu/uploads/ckfinder/userfiles/files/84987867867.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fedfbe2425---pibedunejewa.pdfIn PDF document text
    • https://goodline.by/userfiles/file/84515926755.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_off0000d764.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD764 17704 bytes
SHA-256: 55bf404f4cd4f6aae4b23a922f4af4a6b3c32b0dfae80880f0111ef183ee8660
font_01_sfnt_off000104fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104FE 10324 bytes
SHA-256: c4c218adcc4a2de2e5cd04797f5cfad8fb22fb9d101afe7e009bff7b79a866b7
font_02_sfnt_off00011c7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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