Malicious PDF — malware analysis report

Static analysis result for SHA-256 66fcccc6c6ecc2e0…

MALICIOUS

PDF

68.5 KB Created: 2021-09-16 13:48:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 551e018e8c1d950e79867bfe2f3cb95e SHA-1: 7a3376e25d5f1ffb0214c70989c9623e9058e4d5 SHA-256: 66fcccc6c6ecc2e07f6982408ff5661fe7796cc126eee821a439528855254108
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for malicious PDFs to execute actions upon opening. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the numerous extracted URLs indicate that the primary purpose is to redirect users to a large collection of other PDF files hosted on potentially disposable domains. This suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://laborke.ru/uplcv?utm_term=flip+skater+mod+apk PDF link annotation
    • http://markone-tools.com/upload/files/11662791780.pdfIn PDF document text
    • https://menuiserie-sainte-anne.fr/userfiles/file/10245272477.pdfIn PDF document text
    • http://pphu-joanna.pl/fckpliki/file/fupakeza.pdfIn PDF document text
    • https://discovercefalu.it/_data/images/file/dunowiwurutalewetezefala.pdfIn PDF document text
    • http://mientaytourist.com/uploads/files/nalejaga.pdfIn PDF document text
    • https://nmcs.ca/userfiles/files/xilurirexuze.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613305124cce9---xexibigefijagexudaneniku.pdfIn PDF document text
    • http://webcertain.asia/contentupload/fckeditorUploads/organization_/file/kunisalegimagelogazebojur.pdfIn PDF document text
    • http://twgo8.com/uploads/base/files/202109050832229033.pdfIn PDF document text
    • https://efficientinfocomm.com/ckfinder/userfiles/files/zorekidapuwebaxidoredivus.pdfIn PDF document text
    • https://www.paseppe.gr/ckfinder/userfiles/files/28542417127.pdfIn PDF document text
    • http://spellenindex.nl/images/uploads/53164627385.pdfIn PDF document text
    • https://campermagazine.tv/public/file/tujupemuzibukusowuvofusu.pdfIn PDF document text
    • http://aybar-gallery.com/userfiles/files/wolajotikokofa.pdfIn PDF document text
    • http://vallovin.it/userfiles/files/42304894028.pdfIn PDF document text
    • http://titibbs.xyz/js/ckfinder/userfiles/files/bamojufunanit.pdfIn PDF document text
    • http://www.diplomat2014.ru/ckfinder/userfiles/files/70891927193.pdfIn PDF document text
    • http://aburobocon2019.mnb.mn/uploads/files/tobasebusofinopiniradodeb.pdfIn PDF document text
    • http://velapower.com/glwh/UploadFile/file/2021091607294973499.pdfIn PDF document text
    • http://sm300159.agchost.com/userfiles/files/2353820433.pdfIn PDF document text
    • https://corpusbg.com/files/fck/file/dofibuvisez.pdfIn PDF document text
    • https://creteservices.com/FCKeditor/userimages/file/99886319700.pdfIn PDF document text
    • https://vibanghanoi.com/uploads/files/tozumeserug.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_off0000aed6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAED6 15336 bytes
SHA-256: b65026b67f3cc42950e3c6f2fc3713d28bfd3ec9a9e9e890c5b141e08f95ac9a
font_01_sfnt_off0000d4c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4C6 10516 bytes
SHA-256: 98217ee25d8cb86898e625be3b34dc6d79c3eea8424b8ded7a645d1a56ebb4e6
font_02_sfnt_off0000ecbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECBD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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