Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1d3ebd604889843…

MALICIOUS

PDF

68.3 KB Created: 2021-09-30 16:45:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5ad801327562ce2be060d49d620e0a5c SHA-1: f0b56aecbcb3353782667bbd7c833aa184855dbf SHA-256: a1d3ebd60488984346f8ba908337d93993dba83aa6c91c1a0e8fe4769a6f388e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, embedding a large number of URLs pointing to disposable hosting, designed to redirect users to malicious content. The presence of numerous external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 5

  • 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.
  • 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://philabc.ru/uplcv?utm_term=watch+say+yes+to+the+dress+lancashire+online+free PDF link annotation
    • https://ecpa.fr/uploaded/file/89718464371.pdfIn PDF document text
    • https://konchris.com/userfiles/file/1631368253.pdfIn PDF document text
    • http://aspbae.org/userfiles/file/guwamofi.pdfIn PDF document text
    • http://traviet36.com/upload/files/jopevu.pdfIn PDF document text
    • http://yildizteknikelektrik.net/resimler/files/gotetilenapifafenawojifak.pdfIn PDF document text
    • http://aprt1day.ru/file/wewagurusobiwinawir.pdfIn PDF document text
    • https://chrmglobal.com/userfiles/file/wupurozajeveka.pdfIn PDF document text
    • https://braindevelopmentmaps-org.neurondevelopment.org/userfiles/files/libiparut.pdfIn PDF document text
    • https://globalmediaminds.com/uploads/files/54281804600.pdfIn PDF document text
    • https://birotex.rs/images/files/wadovup.pdfIn PDF document text
    • http://ndt-ultratech.com/files/20698909210.pdfIn PDF document text
    • http://starinviter.com/ckimagefiles/78553999566.pdfIn PDF document text
    • https://serka.com/serka/upload/files/39239262068.pdfIn PDF document text
    • http://tce.vn/imagesflashupload/file/gajusopolife.pdfIn PDF document text
    • http://naitikfashions.com/ckfinder/userfiles/files/pejipurodisemoked.pdfIn PDF document text
    • http://9262895.ru/ckfinder/userfiles/files/74005093614.pdfIn PDF document text
    • https://geniodelweb.com/file/ridapo.pdfIn PDF document text
    • http://gamax-motor.cz/data/dokumenty/pimozoto.pdfIn PDF document text
    • https://ibexquimica.com.br/ckfinder/userfiles/files/19309586654.pdfIn PDF document text
    • http://ngocvietbungalow.com/upload/files/rujeruxowi.pdfIn PDF document text
    • http://hanstime.com/userData/board/file/47144172804.pdfIn PDF document text
    • https://vicareyou.com/userfiles/file/9742082471.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/ubbbr0ufi9hjpnvoj79hdhstf7/mumukarawita.pdfIn PDF document text
    • https://consultemergingmarkets.cubsindia.com/files/xedejamufisufudufejese.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_off0000ae0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE0C 10680 bytes
SHA-256: 1bb6599694d8837cba4336925c3273ef919f3d25dcf4337f5b5c491e8c542608
font_01_sfnt_off0000c68c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC68C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000de9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE9E 14588 bytes
SHA-256: bb6b64af8717d7aec7b552f66cef7109f0915dfee061e6b19d5481bea87795e8

Open this report in the interactive analyzer, or submit your own file for analysis.