Malicious PDF — malware analysis report

Static analysis result for SHA-256 2659ca32596cc541…

MALICIOUS

PDF

79.9 KB Created: 2021-09-19 14:36:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 0553971b8dec10134e161f6380795ccd SHA-1: 5ea75e6c05a659580b1a1b35cf65f743bba96876 SHA-256: 2659ca32596cc541564112390824330a491ea2e8e1bf53ee512102aa3193a66f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous embedded URLs pointing to various domains, suggesting a link farm or redirection mechanism. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a pattern of using disposable hosting for these links, common in phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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=problem+med+android+appar PDF link annotation
    • https://mwasafat.com/uploads/files/juzagukemakaxutasasulote.pdfIn PDF document text
    • http://ominocoibaffi.it/userfiles/files/89897411740.pdfIn PDF document text
    • http://tcsklife.com/filespath/files/20210905005252.pdfIn PDF document text
    • http://artwatch.ru/userfiles/file/reposukapari.pdfIn PDF document text
    • https://balajihighfields.in/userfiles/file/kosududa.pdfIn PDF document text
    • https://getracemirates.com/userfiles/files/11131858300.pdfIn PDF document text
    • https://contact-house.com/fckeditor/upload/file/88716825266.pdfIn PDF document text
    • https://landtop.com/filespath/files/20210916123247.pdfIn PDF document text
    • http://c-amc.com/upload/files/fizisogexawifogorufilew.pdfIn PDF document text
    • http://execdentalclinic.com/uploads/ckfinder/userfiles/files/pojojodetoriro.pdfIn PDF document text
    • http://joyandwowbook.com/upload/file/63744625199.pdfIn PDF document text
    • http://aburobocon2019.mnb.mn/uploads/files/dujipabepeketamonog.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/bupev.pdfIn PDF document text
    • http://eldorautomaticgates.com/UserFiles/file/wibidajavo.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/wokowibod.pdfIn PDF document text
    • http://24horasnoar.com.br/ckfinder/userfiles/files/letanifewatagowusejiza.pdfIn PDF document text
    • http://thietbikhachsanvinhhung1.com/upload/files/nirodululedadan.pdfIn PDF document text
    • https://jv-cms.crazy-jessie.nl/uploads/files/85163942364.pdfIn PDF document text
    • http://seattleteriyaki3.com/uploads/files/sobotivevewivurigure.pdfIn PDF document text
    • http://itnetworkconsultingsf.com/helpdesk/app/webroot/img/userfiles/files/nezapatevakugugebor.pdfIn PDF document text
    • http://modernplating.com/userfiles/file/4745127072.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_off0000d1af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1AF 10428 bytes
SHA-256: 014764465bd6164dd8baba0a1307d2b11c68882e327f76fc7f033bf752cc75c5
font_01_sfnt_off0000e8f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010105.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10105 18396 bytes
SHA-256: 5bbdeb6f5348ac04a7bd941f9879135e34fa8c2341884eceef92f5bc11425b54

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