Malicious PDF — malware analysis report

Static analysis result for SHA-256 3555d359fbb3b49d…

MALICIOUS

PDF

85.7 KB Created: 2021-09-18 09:42:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 678bfd8bb7074f1c0e4e6f93335a612d SHA-1: 6fd678d623caeb2150e22075037b6c20a7f9ffc1 SHA-256: 3555d359fbb3b49dbac100cbeef6224a68b0ea8e4295f2e8b3f3f45d6d4d411d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links, likely to redirect users to malicious sites. While no scripts were directly extracted, the PDF structure and embedded URLs point towards a phishing or downloader attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://leanuslab.com/UserFiles/file/87858553573.pdf In PDF document text
    • http://theloanwala.com/userfiles/file/84415974740.pdfIn PDF document text
    • https://manpowernepal.net/ckfinder/userfiles/files/sivofejotorak.pdfIn PDF document text
    • http://bebsulmare.com/userfiles/files/90244899196.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff8aa82682---60306178059.pdfIn PDF document text
    • http://unitec-egypt.net/userfiles/file/50476198300.pdfIn PDF document text
    • https://agrimal.pl/userfiles/file/16684041792.pdfIn PDF document text
    • https://chameleoncoupons.com/adgprocessing/uploads/files/xipaket.pdfIn PDF document text
    • http://www.casasemio.com.br/ckfinder/userfiles/files/48291113880.pdfIn PDF document text
    • http://fonnepal.org/userfiles/file/32641543384.pdfIn PDF document text
    • http://pttaccounting.com/userfiles/files/majofapi.pdfIn PDF document text
    • https://signatureshreyas.in/userfiles/file/96186757939.pdfIn PDF document text
    • https://emotionalgift.youngzonejewelry.com/ckfinder/userfiles/files/21698509183.pdfIn PDF document text
    • https://iasvn.org/Images_upload/files/xuwatitanemesaril.pdfIn PDF document text
    • http://planao.com/ckfinder/userfiles/files/24562067179.pdfIn PDF document text
    • https://www.bbmnetlicitacoes.com.br/cms/ckfinder/upload/files/levenoxapifaviwatev.pdfIn PDF document text
    • https://vegastel.eu/components/com_mijoshop/opencart/image/data/files/88540082370.pdfIn PDF document text
    • https://vpmemorial.net/images/file/taseposafutanij.pdfIn PDF document text
    • http://re-media.ru/foto/ck/files/82485895141.pdfIn PDF document text
    • http://nanoservice.cz/upload/file/25538618200.pdfIn PDF document text
    • http://moestuinwebshop.nl/userfiles/file/62594587446.pdfIn PDF document text
    • http://wordtmann.beckbauer.eu/ckfinder/userfiles/files/donawuxununa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=my+apps+stopped+working+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_off0000eb37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB37 17376 bytes
SHA-256: 1686aa741bdf1ef9e00008d6b534a8ccd59784fe943fefe96a33b27905d70146
font_01_sfnt_off000117f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001300c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1300C 10804 bytes
SHA-256: 84a0c4d2b24e7dc7d998f9eace66b4e792e9b891395f7029b1d4f0f04a1ab40d

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