Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f04216b04977474…

MALICIOUS

PDF

79.3 KB Created: 2021-09-10 00:48:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: afb63a1aacd02a59a24d37a101902944 SHA-1: 4cba8acd06ad1aec7eca4e735c4f3e58dc6eb6ff SHA-256: 5f04216b0497747470ad6a9409ce890fd7922058e0db6044047a0967f409a97d
134 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 suggest a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/0077265850ccd7c79cef6c439a6af783/70148710279.pdf In PDF document text
    • https://sanagustin.cl/files/33793785243.pdfIn PDF document text
    • http://lamexmarket.com/uploads/files/lisadowasumiropitole.pdfIn PDF document text
    • http://syarmarka.ru/userfiles/files/84490644917.pdfIn PDF document text
    • https://svingenieria.cl/userfiles/file/nanujokigumevetesatovobak.pdfIn PDF document text
    • https://calprin.com/ckfinder/userfiles/files/rilasovemes.pdfIn PDF document text
    • https://kohphanganhotelandtour.com/userfiles/file/42838123304.pdfIn PDF document text
    • https://taxforce.nl/userfiles/files/5150004216.pdfIn PDF document text
    • http://wksx.top/images/userfiles/file/nuzigomokiriwidafiwu.pdfIn PDF document text
    • http://bctlorraine.org/userfiles/file/61261994866.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/60186339196.pdfIn PDF document text
    • http://homeopathyhongkong.cn/files/47340883494.pdfIn PDF document text
    • http://thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/46338646599.pdfIn PDF document text
    • http://decorstore.eu/upload/file/damukuvobenuvesij.pdfIn PDF document text
    • http://www.detskaoptika.cz/ckfinder/userfiles/files/28370481001.pdfIn PDF document text
    • https://yk-tech.com.tw/ckfinder/uploads/ckfiles/files/91526894888.pdfIn PDF document text
    • https://billard-hauri.ch/userfiles/file/lilejekexopasa.pdfIn PDF document text
    • http://airholic.com/UpFiles/WebEditorFiles/file/bizaxazawavijijupomupi.pdfIn PDF document text
    • http://bapassamarinda.id/assets/ckfinder/core/connector/php/uploads/files/92627663023.pdfIn PDF document text
    • https://nurdagihaber.com/resimler/files/mozuba.pdfIn PDF document text
    • http://wamaeassociates.com/images/uploads/originals/file/20306072589.pdfIn PDF document text
    • https://ichibaninfotech.com/ckfinder/userfiles/files/49325470210.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16132c46b1c5fe---fejaxijujum.pdfIn PDF document text
    • http://flexinform.com/hirlevel/file/jowojiga.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=british+english+grammar+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_off0000cf86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF86 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e798.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE798 18476 bytes
SHA-256: 21c7298b1b2839bc64c185e60fae43a43d65122cb003370926129e384ae63843
font_02_sfnt_off000116e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116E8 10876 bytes
SHA-256: 5915dbb013e5a05f62c819f1cd2581cd25124eb5de653f4ddf7f75d5801571ff