Malicious PDF — malware analysis report

Static analysis result for SHA-256 c23fee7aa44f1dbc…

MALICIOUS

PDF

81.9 KB Created: 2021-09-10 19:48:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 24ff09b46993cdc1233e2fb1f7d60403 SHA-1: 9258c279db42eb7e69100621011abe38004b9f28 SHA-256: c23fee7aa44f1dbc170ac7162e83271a32246799dab7ebd955bae7ba512fe23e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to disposable hosting and are structured as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution by redirecting users through a series of links. The embedded JavaScript is a common technique for executing malicious code within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 6

  • 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.
  • 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://queure.ru/uplcv?utm_term=how+to+make+a+villager+trade+what+you+want PDF link annotation
    • http://metaglas.kr/userData/board/file/mutelagugomabalu.pdfIn PDF document text
    • https://emailing-online.fr/uploads/userfiles/file/zodiweteposivusorizesenob.pdfIn PDF document text
    • http://ssatripoli.org/userfiles/file/42879546901.pdfIn PDF document text
    • http://tensoinox.com/userfiles/files/fivalixizulusuzekamekaviv.pdfIn PDF document text
    • http://pnktools-th.org/ckfinder/userfiles/files/20950929009.pdfIn PDF document text
    • http://reversetheclocknow.com/ckfinder/userfiles/files/sogukupazumutefuni.pdfIn PDF document text
    • http://aluminial.pnh.pt/js/ckfinder/userfiles/files/gosekexevojijafolumes.pdfIn PDF document text
    • http://goldmustang.com/files/files/niriroso.pdfIn PDF document text
    • http://etabetasurvey.com/userfiles/files/fekufofifudegil.pdfIn PDF document text
    • https://roshnaai.com/ckfinder/userfiles/files/17096450351.pdfIn PDF document text
    • https://tavcam.com/upload/ckfinder/files/85929358810.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/161342b8a96fc2---begorosotunaruruved.pdfIn PDF document text
    • http://checopharma.com/upload/files/65393094429.pdfIn PDF document text
    • http://em-mould.com/ckfinder/userfiles/files/3014162400.pdfIn PDF document text
    • https://hgindustrial.eu/userfiles/files/gafokuxite.pdfIn PDF document text
    • http://print-printonline.com/ckfinder/userfiles/files/lunufa.pdfIn PDF document text
    • https://youxsoft.com/uploads/files/zefolumibopufo.pdfIn PDF document text
    • http://agriturismolataggiasca.eu/userfiles/files/mitekuronowavenonegusemo.pdfIn PDF document text
    • http://hytechplus.com/userfiles/file/16792776485.pdfIn PDF document text
    • http://infinivideo.hu/sites/infinivideo/files/90977891471.pdfIn PDF document text
    • http://ktcz.eu/files/files/8893007523.pdfIn PDF document text
    • https://ietc-oman.com/userfiles/files/14391272938.pdfIn PDF document text
    • http://viquadro.com/userfiles/files/12455528690.pdfIn PDF document text
    • https://value.ae/userfiles/file/19154500833.pdfIn PDF document text
    • http://arcenevents.nl/site/upload/files/66854076563.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/b437d1d81e760c48b04edc9db8c94408/wududirevupesuleti.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_off0000d901.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD901 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f118.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF118 10976 bytes
SHA-256: e89f1ec2da60d7d3ddc3571f5ceebf06ffd153f7a1f8015f5a4f6d754ca0c4d0
font_02_sfnt_off00010a21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A21 18496 bytes
SHA-256: c8dbe50595805f4e384b1a34a47530ee7156d69bd4afaa49c8697171299ca8f8