Malicious PDF — malware analysis report

Static analysis result for SHA-256 27db1ef5efcf8140…

MALICIOUS

PDF

73.1 KB Created: 2021-09-11 10:33:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0a3161cbd900864bfdfe80e9636092e1 SHA-1: 618f163742117db6a6961c6a1f3c5b844e6a2ad3 SHA-256: 27db1ef5efcf8140bcb8dcb0548ab7e0901a26ee0165cafdcab7b245636739e9
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains embedded JavaScript and numerous external URIs, including one pointing to a link farm on disposable hosting. The presence of embedded JavaScript suggests an attempt to execute malicious code, likely to redirect the user to one of the listed URLs for further exploitation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://philabc.ru/uplcv?utm_term=view+source+chrome+mobile+android PDF link annotation
    • https://kmkmekanik.com/upload/ckfinder/files/faluwagazuvipinewofa.pdfIn PDF document text
    • http://xn--q20b13r9leepaeb.net/upload/file/202109050535546440.pdfIn PDF document text
    • http://101eyewear.com/luutru/files/gabokosisewerewefubuxukid.pdfIn PDF document text
    • http://distant-property.ru/fck_editor_files/files/verigififenisaf.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/49718671964.pdfIn PDF document text
    • http://flagrant-desir.com/userfiles/file/10977805585.pdfIn PDF document text
    • https://fobh.net/userfiles/files/vokefuxukidenisetezaxurum.pdfIn PDF document text
    • http://szamosiszerviz.hu/feltoltott/files/jiwepegenojuxevem.pdfIn PDF document text
    • https://www.sudoku-cool.com/ckfinder/userfiles/files/32644050898.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff5008135d---10083915018.pdfIn PDF document text
    • http://vstarmp.cn/upload/files/20210905_123338.pdfIn PDF document text
    • https://doucetplasticsurgery.com/ckfinder/userfiles/files/15965665094.pdfIn PDF document text
    • http://mizuho-co.net/file/ck/files/lidisunobo.pdfIn PDF document text
    • http://9meclinic.com/ckfinder/userfiles/files/notivinomurubujokep.pdfIn PDF document text
    • http://stcforanebanglore.smcim.com/www/js/ckfinder/userfiles/files/16627608334.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/gutifazakad.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/nmf7dqqb62k18di22c9ta948ei/50680698171.pdfIn PDF document text
    • https://bodymart.in/ckfinder/userfiles/files/80134539294.pdfIn PDF document text
    • http://metamorfoza-krosno.pl/userfiles/file/60988324673.pdfIn PDF document text
    • https://chowdhurytourism.com/ckfinder/userfiles/files/83032275398.pdfIn PDF document text
    • https://asiquim.com/ckfinder/userfiles/files/fadugedanewu.pdfIn PDF document text
    • https://pypconsultores.mx/userfiles/file/95108208303.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_off0000b9c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9C6 17140 bytes
SHA-256: 8dcc55765e0c835d989a7b1f177d888b6544f387f1b4731f45ad47a233a7278d
font_01_sfnt_off0000e5d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D2 10832 bytes
SHA-256: 82c7e71c89c83e17b7db5b46a232cbe856fc155a0be130836e42f8583d7da4b1
font_02_sfnt_off0000feae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEAE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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