Malicious PDF — malware analysis report

Static analysis result for SHA-256 c835f14d70dbff90…

MALICIOUS

PDF

78.6 KB Created: 2021-09-11 04:24:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 702aa246f26107b44e70ff72622491ca SHA-1: 6748a5868ae008f85c13ddc18f780cabb52c7c61 SHA-256: c835f14d70dbff908ae592b3b5e1d0109e883b9cf24558223d3604015c89575d
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. The PDF also contains numerous external URIs, many of which point to disposable hosting and are part of a link farm, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://coretry.ru/uplcv?utm_term=bestwap+life+your+name+ringtone PDF link annotation
    • http://daisin1977.com/js/upload/files/wetowoxema.pdfIn PDF document text
    • http://vinaaquachem.com/uploads/files/29932647031.pdfIn PDF document text
    • http://lizhechem.com/upload/files/puroz.pdfIn PDF document text
    • http://elma-itc.ru/!upload/files/wumam.pdfIn PDF document text
    • http://sk-uralstroy.ru/uploads/files/vutifo.pdfIn PDF document text
    • https://maintogelonline.bet/contents/files/wezisamufi.pdfIn PDF document text
    • http://szerecsen.hu/editor_up/petufebak.pdfIn PDF document text
    • https://sunpower.lv/ckfinder/userfiles/files/59118298519.pdfIn PDF document text
    • https://cubic.is/userfiles/file/38155678005.pdfIn PDF document text
    • http://vinczeandlaszlo.com/upload/64349542736.pdfIn PDF document text
    • http://okuninka-biale.pl/userfiles/file/xifibakij.pdfIn PDF document text
    • https://cbdc.co/uploads/ckfinder/userfiles/files/72399221061.pdfIn PDF document text
    • http://sswjeans.com/files/66055822612.pdfIn PDF document text
    • http://ourdesign.hk/ckfinder/userfiles/files/rudabuka.pdfIn PDF document text
    • https://albizy.com/ckfinder/userfiles/files/wudozo.pdfIn PDF document text
    • http://mea-travel.pl/userfiles/file/46016809722.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/161302a4d62e09---puvudebisadu.pdfIn PDF document text
    • http://parquet-cortes.fr/data/Files/pevuridakanofetigakoxuxe.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/afb8b8f67e8503ddd3da0c4fb3eb0423/3961596056.pdfIn PDF document text
    • http://yuhongzg.com/d/files/29877565189.pdfIn PDF document text
    • http://amy-tsai.com/images_express/userfiles/files/loxofamudelima.pdfIn PDF document text
    • http://vncdata.net/app/webroot/uploads/files/62830292170.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137b304d7dbf---bagufibekokexisuzigenu.pdfIn PDF document text
    • http://skogsformedling.se/bilder_umeny/File/10887040311.pdfIn PDF document text
    • http://eska-lift.ru/userfiles/file/tuvone.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_off0000cf41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF41 16972 bytes
SHA-256: ab9dfbbb42aa24d96746e67e9fa605f8f1ec60f6c7cacbbbd0d351a262f76283
font_01_sfnt_off0000fb16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB16 11052 bytes
SHA-256: edd4c357545f6973b1913e1c51c184a95ed42e533abac01bf072e2747752a4b3
font_02_sfnt_off000114ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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