Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2d3d6e8fd7cf724…

MALICIOUS

PDF

83.6 KB Created: 2021-10-05 09:20:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: f4e58c69a09d44dfc813a577ced0d9f6 SHA-1: e091103b894e2feac8fcfb4b3a289e67abac2d1f SHA-256: a2d3d6e8fd7cf724bc4d19f3282ff2eb88097b16d18303cd4aa3a49fac32a5a7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to disposable hosting, suggesting a link farm designed to redirect users to potentially harmful sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior, indicating a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://smidgel.ru/uplcv?utm_term=ammonia+reacts+with+hydrogen+chloride PDF link annotation
    • https://scmsgroup.org/ckfinder/userfiles/files/14219217663.pdfIn PDF document text
    • https://sportuna.be/ckfinder/userfiles/files/77862493380.pdfIn PDF document text
    • http://mitroc.com/userfiles/file/16093556211.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1615216ca78bdb---jasaburapa.pdfIn PDF document text
    • http://xinghui.co/upload/ckimg/files/202109102136265665.pdfIn PDF document text
    • http://netisiletisim.com/guvennet/resimlerfiles/mifofe.pdfIn PDF document text
    • https://mtmhomeschool4art.com/mycms/uploadedimages/editorUploadedImages/file/6842823177.pdfIn PDF document text
    • http://letsfinal.com/userfiles/file/77507798504.pdfIn PDF document text
    • https://mahanakhon.pacedev.com/ckupload/files/wibawudisipadulaxu.pdfIn PDF document text
    • https://gegeny.hu/uploads/file/dowovukavidavibi.pdfIn PDF document text
    • http://wonderful-foods.net/userfiles/file/gugefaxifukivuzasuv.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/dipumutefeduwigewivi.pdfIn PDF document text
    • http://sochi-riba.ru/ckfinder/userfiles/files/7556735156.pdfIn PDF document text
    • https://filetorme.com/upload/files/64497022086.pdfIn PDF document text
    • http://crocepadrekolbe.it/userfiles/files/nikuxi.pdfIn PDF document text
    • http://contactfm.be/userfiles/files/38208501784.pdfIn PDF document text
    • http://gewald.ru/content/Files/bejebaniloludu.pdfIn PDF document text
    • http://hevolta.com/upload/file/jipizogovaponadonura.pdfIn PDF document text
    • http://stressmanagement-karriere.de/userfiles/file/mikoxaxevisuzot.pdfIn PDF document text
    • https://majubesar.org/contents/files/29632049344.pdfIn PDF document text
    • http://www.temaricerca.com/entry2013/admin/ckfinder/userfiles/files/tuviwaloripigibaridap.pdfIn PDF document text
    • http://lngpetro.com/userfiles/file/46752992501.pdfIn PDF document text
    • https://xn--80aaijzh9b.xn--90ae/documents/file/mosogokixabesubuduv.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_off0000dcc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC3 19528 bytes
SHA-256: 629c574af557be1ed0f61f483a98d086507ef6c1da15dc6dcb9fa2b24778aafc
font_01_sfnt_off00010f3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012751.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12751 10996 bytes
SHA-256: a6877b749ed9b22996cd81db15ae395fb162a61d49698c8ae894c1b63e93e4cd

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