Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9c98591963be877…

MALICIOUS

PDF

92.8 KB Created: 2021-09-17 02:08:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 84a3117365bffa161b1c32fa4d96c275 SHA-1: ad5066ab235798d37466761d6d69af4cde95e636 SHA-256: b9c98591963be8771be68cf77ba5dda736e698dd8168a046921d94858696b2d3
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to facilitate the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://ketchas.ru/uplcv?utm_term=best+spoofing+app+for+pokemon+go+2020 PDF link annotation
    • https://andrejc.si/files/file/23688366448.pdfIn PDF document text
    • https://commonwealthsportsawards.com/userfiles/file/50606806039.pdfIn PDF document text
    • http://alfonsoguiggiarchitetto.it/userfiles/files/bozopirizopugijizedoparob.pdfIn PDF document text
    • https://geniodelweb.com/file/lutirebimedon.pdfIn PDF document text
    • https://mlbcsimleague.com/ckfinder/userfiles/files/86224045891.pdfIn PDF document text
    • http://taketty.xyz/js/ckfinder/userfiles/files/91123100726.pdfIn PDF document text
    • http://runnersavezzano.it/public/userfiles/file/zosoxemobifasudu.pdfIn PDF document text
    • http://medicalproduct.hu/images/files/derijarisatuzunimawoj.pdfIn PDF document text
    • http://cherriestattoo.com/ckfinder/userfiles/files/fabaxo.pdfIn PDF document text
    • http://toyotarent.tw/FileData/ckfinder/files/20210913_CEA17F10D3A2D0D4.pdfIn PDF document text
    • http://hicoweld.com/shop/fck_file/file/movoga.pdfIn PDF document text
    • https://mbamantra.com/ci/userfiles/files/ludepevogasoluzutalar.pdfIn PDF document text
    • https://studiovizia.com/webroot/img/content/files/vipisa.pdfIn PDF document text
    • https://aep-tc.com/cache/fck_files/file/81256137068.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/193cab8a5fa6dbc9e97af81f3c2d914e/9637215592.pdfIn PDF document text
    • http://derkwoo.com/upload/editor/files/91438234225.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/a205647c9269c5fd987d1cb2d609b567/39152903261.pdfIn PDF document text
    • https://podimercrm.com/img/files/dunajonudamanegazi.pdfIn PDF document text
    • https://33mobility.net/uploads/files/nasakatedipi.pdfIn PDF document text
    • http://aybar-gallery.com/userfiles/files/82305174019.pdfIn PDF document text
    • http://fred-robin.com/ckfinder/userfiles/files/jogepanitawugo.pdfIn PDF document text
    • http://vibrator4you.cz/UserFiles/File/26828317928.pdfIn PDF document text
    • https://clubberia.com/js/ckfinder/userfiles/files/vazumekolo.pdfIn PDF document text
    • http://hunting.kg/userfiles/file/93850920734.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_off00010370.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10370 18344 bytes
SHA-256: 497d2792981118e9170f0b7d04b64c3f4f2090c700afba5a655747fcdf258ef8
font_01_sfnt_off0001334b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1334B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014b62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B62 11044 bytes
SHA-256: cb2616c9a8e389621514f8c24d8bae50fde2922b5d2571d77f3a4b3a82f292dc

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