Malicious PDF — malware analysis report

Static analysis result for SHA-256 19465c7cbec318aa…

MALICIOUS

PDF

80.2 KB Created: 2021-09-21 09:16:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 928d94d4d437f6a6e2e4f6ac4f35dcc8 SHA-1: 2227ea6aaba3fc578cf9a2e05bd6a8aff2624280 SHA-256: 19465c7cbec318aade0e130d50c8da8a2691c5e180ec9c9c970e7d330dc9c22c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains numerous embedded URLs, many of which point to unknown or potentially malicious domains, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a malicious document designed to redirect users to external content.

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://www.karelo.com/uploads/File/wexukibem.pdf In PDF document text
    • http://de-ko-gmbh.com/ckfinder/userfiles/files/vedunabelogi.pdfIn PDF document text
    • http://dblbtech.com/userfiles/file/91040092308.pdfIn PDF document text
    • http://www.gabrielamaciel.net/images/content/file/zizapejuwevibufi.pdfIn PDF document text
    • https://alpinebadmintonacademy.com/ckfinder/userfiles/files/lojunedulefebipeta.pdfIn PDF document text
    • http://tangiahoang.vn/Images_upload/files/kiledimadamapin.pdfIn PDF document text
    • https://curtain.jinware.com/upload/files/pasulebit.pdfIn PDF document text
    • https://wwa.bdbabymart.com/app/webroot/ckfinder/userfiles/files/3259152578.pdfIn PDF document text
    • https://millersexpress.com/userfiles/file/74756522228.pdfIn PDF document text
    • https://dpt-mh.com/uploads/news/files/41474427369.pdfIn PDF document text
    • http://jutaek.humenia.com/upload/userfiles/2021/09/files/210909124428.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/bepedijuwon.pdfIn PDF document text
    • http://maturitni-ples.eu/UserFiles/File/51714716822.pdfIn PDF document text
    • https://seedomoretravel.com/files/files/90437433768.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145e74b6d3d0---wazelebadijukowasig.pdfIn PDF document text
    • https://stillwaiting.org/userfiles/file/81004486231.pdfIn PDF document text
    • http://mfahk.com/upload/files/wujofuvotefoj.pdfIn PDF document text
    • https://avistravel.ro/userfiles/file/vowewojebepunigidatit.pdfIn PDF document text
    • http://neonatal-surgery.ru/userfiles/files/lazawotapujewomosisife.pdfIn PDF document text
    • https://riolisboa.com/images/ul_files/file/NFre17h6p5bR.pdfIn PDF document text
    • http://sahrugs.com/userfiles/file/79010965642.pdfIn PDF document text
    • http://smm-mm.com/uploads/news_file/rapidujapurotoku.pdfIn PDF document text
    • http://sushi-belovo.ru/files/zulelusugakipokovipagid.pdfIn PDF document text
    • https://mongolia-volkslift.com/uploads/files/fopijogorilinip.pdfIn PDF document text
    • http://lexen.ca/userfiles/files/25328918575.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+rename+icons+on+androidPDF 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_off0000d3e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3E7 10560 bytes
SHA-256: f58c2fdc431f35474f32d700bd1b1e8a4010b23acf67d286910c96726db2eff3
font_01_sfnt_off0000ec00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC00 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010412.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10412 18220 bytes
SHA-256: d9f4a2fcd74ba370a305ddc97d917f25cc0ae607bc75918d5feb1675644e4bea

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