Malicious PDF — malware analysis report

Static analysis result for SHA-256 40a9430ee0dd00fc…

MALICIOUS

PDF

83.0 KB Created: 2021-09-08 14:49:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 8c0f2e4375421daaf9738a5ee71bc299 SHA-1: 2afdf11051567d2bff427032e1bdd7334860af0b SHA-256: 40a9430ee0dd00fc4baea7343011be8a181b792ece67b3e52f0af17911476468
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the numerous unknown URLs indicate a redirection to a large collection of other PDFs, suggesting a phishing or malware distribution campaign. The ClamAV detection further confirms its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://rafaellopezehijo.com/upload/files/soxofenivifite.pdf In PDF document text
    • http://galeriejacqueselbaz.com/userfiles/file/jerem.pdfIn PDF document text
    • http://rosabaum.de/web/editor/files/50963700852.pdfIn PDF document text
    • https://suavitinhtannha.net/upload/files/95584987308.pdfIn PDF document text
    • https://afgventuregroup.com/cfiles/file/1412051198.pdfIn PDF document text
    • http://mamam.by/upload/File/file/42270882387.pdfIn PDF document text
    • http://arenda-v-novosibirske.ru/ckfinder/userfiles/files/nerutef.pdfIn PDF document text
    • http://garage-fuji.jp/js/upload/files/lesuvejomodolot.pdfIn PDF document text
    • http://wadsoda.com/UserFiles/File/38758124650.pdfIn PDF document text
    • http://huyminhplastic.com/upload/files/12566584190.pdfIn PDF document text
    • http://tsraccountants.nl/mailing/images/photo/file/gekoda.pdfIn PDF document text
    • http://ecolservizinettuno.com/userfiles/files/xozijizoluxik.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/16131825eaa758---10084112440.pdfIn PDF document text
    • http://futimisdev.com/userfiles/file/25524933383.pdfIn PDF document text
    • https://a-pointpro.com/cms/ckfinder/userfiles/files/toxenedavixowuker.pdfIn PDF document text
    • http://studiotecnicopetrillo.eu/userfiles/files/27456226644.pdfIn PDF document text
    • https://reitinguok.lt/userfiles/file/33266397905.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/14217141649.pdfIn PDF document text
    • http://dienlanhlongan.com/upload/files/30657051828.pdfIn PDF document text
    • https://ctapigroup3.com/contents/files/36266181761.pdfIn PDF document text
    • https://deltagroup.bg/uploads/file/patabikinubekosuxitapokex.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/e05294d7ac79723fa0b63755f9041bd6/newunanes.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=paises+hispanohablantes+pdfPDF link annotation
    • 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_off0000d93a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD93A 10636 bytes
SHA-256: c5081174d10c2c4c7990fa16dfe2f0b7f15b15174980d61e5f27b3302ebf6c8d
font_01_sfnt_off0000f139.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF139 20452 bytes
SHA-256: 0ac10dc7c631230bf0b485e78a1bc28d22a04d9d80bf73617e147797bd350711
font_02_sfnt_off000126c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1