Malicious PDF — malware analysis report

Static analysis result for SHA-256 c424284ede4f929a…

MALICIOUS

PDF

84.0 KB Created: 2021-09-15 03:24:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 716815bac7939907e77d45a721854a66 SHA-1: bd3b92c3d4737c237856057fea16fafa19f4efdf SHA-256: c424284ede4f929adfceaeb8a5398a584a5004b13d97e1d14af43eafa186888e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to suspicious domains and are likely used to redirect users to malicious sites. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests a link farm designed to obscure the true destination, a common tactic in phishing and malware distribution campaigns. No scripts were extracted, but the overall structure and URL distribution point towards a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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 http://gatewayhotelbangkok.com/upfile_hotel/files/vumotikumagelip.pdf In PDF document text
    • http://botosani.ro/img/uploads/file/lugewifizep.pdfIn PDF document text
    • http://twilaw.com/files/files/2322755133.pdfIn PDF document text
    • https://calprin.com/ckfinder/userfiles/files/46229217139.pdfIn PDF document text
    • http://bajajsports.com/userfiles/file/kebazuxedilobidofizalibuk.pdfIn PDF document text
    • http://retailcop.ca/files/33013373162.pdfIn PDF document text
    • http://lobanowscy.pl/userfiles/file/xiruximobus.pdfIn PDF document text
    • https://ctcitsupport.com/media/files/63057555071.pdfIn PDF document text
    • https://llbyggodesign.se/UserFiles/files/donojezatip.pdfIn PDF document text
    • http://lungshingcentre.com/userfiles/91588772770.pdfIn PDF document text
    • https://zenit-npk.ru/files/file/72786425122.pdfIn PDF document text
    • http://softwaretesting.kr/club/data/userfiles/file/20210909153507.pdfIn PDF document text
    • http://niezapominajkowo.eu/userfiles/file/97923188363.pdfIn PDF document text
    • http://frutapac.com/ckfinder/userfiles/files/36839319660.pdfIn PDF document text
    • https://www.pessin-location.fr/ckfinder/userfiles/files/98382745961.pdfIn PDF document text
    • http://ngocminhcnc.com/demo_thietbimay_24_7/upload/files/difesij.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c899d40ae7---tujumiwitusefiwarez.pdfIn PDF document text
    • http://th-hl.com///upload/files/70457106020.pdfIn PDF document text
    • https://stealthwindow.tw/uploads/files/202109052033168136.pdfIn PDF document text
    • http://koszyczarek.pl/userfiles/file/11003502073.pdfIn PDF document text
    • http://yuanhebiotech.com/upload/files/31862448705.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613488096a8c6---58666043022.pdfIn PDF document text
    • http://shiraz.sk/ckfinder/userfiles/files/bedexa.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/29029651952.pdfIn PDF document text
    • https://mptradingcompany.com/userfiles/file/wikapijot.pdfIn PDF document text
    • http://rmgoals.com/userfiles/files/32231442394.pdfIn PDF document text
    • http://www.uc-kushiro.net/images/library/File/sovaxuriterozimut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=oxford+dictionary+of+psychology+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_off0000e009.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE009 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f81b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF81B 18704 bytes
SHA-256: 17e5666e271f1b5f2c4794fdbf7e50c14e7e1ffbb987e64eb3867c777aaed334
font_02_sfnt_off0001286d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1286D 11008 bytes
SHA-256: 92bea4de5f822a703b0d5c5a5de075f0a9d689ddff8c384a007bc1685abb1961