Malicious PDF — malware analysis report

Static analysis result for SHA-256 9900bc9c650ea4aa…

MALICIOUS

PDF

73.7 KB Created: 2021-09-14 00:09:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7ea847afb1ceee3fab3cf3c21f4f0352 SHA-1: 82a59474663e2f01439d0ab56a5c190da92b9945 SHA-256: 9900bc9c650ea4aa19c64eef6c30f80a48c5706446bfe76efe3bb528c0392d74
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous external URIs and is described as a link farm on disposable hosting, indicating a phishing or scam attempt. The PDF structure and embedded URLs suggest it's designed to redirect users to malicious websites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://infrive.ru/uplcv?utm_term=iphone+5s+price+in+bangladesh+2020 PDF link annotation
    • http://hidropro.hu/upload/47983072072.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/84361275303.pdfIn PDF document text
    • https://rabudiagnostic.com/userfiles/files/10659378166.pdfIn PDF document text
    • https://pharma-tools.pl/galeria/file/64843087667.pdfIn PDF document text
    • https://terrebleue.org/userfiles/file/67406140673.pdfIn PDF document text
    • http://funkyspa.net/ckfinder/userfiles/files/nifavivi.pdfIn PDF document text
    • http://vector-mebel.ru/uploads/files/84874848100.pdfIn PDF document text
    • http://rockhouseschool.com/rockhouse/uploads/files/40082500537.pdfIn PDF document text
    • http://aostavet.it/userfiles/files/rutikudu.pdfIn PDF document text
    • http://naasschoolofmotoring.ie/fckeditor/userfiles/file/lerubibijonovuwifofu.pdfIn PDF document text
    • https://christianbelieversmatrimony.com/web/christiansbelieversmatrimony/photos/ckeditor/files/40945832356.pdfIn PDF document text
    • https://italvaping.com/file/87024139887.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/16133e708d169b---pitegimox.pdfIn PDF document text
    • http://stattus.com/assets/file/9493655136.pdfIn PDF document text
    • http://talani.nl/userfiles/image/file/jagepigirifakukigisosi.pdfIn PDF document text
    • http://maternites-catholiques.org/ressource/site-image/files/gefivusixelulu.pdfIn PDF document text
    • https://hardlineconstruct.ro/app/webroot/files/userfiles/files/winepasixadegijol.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/64359393571.pdfIn PDF document text
    • http://saaretravel.ee/images/file/vipiti.pdfIn PDF document text
    • http://aktasmatbaacilik.com/resimlerfiles/wipinatodonedofura.pdfIn PDF document text
    • https://cryptoshift.be/anaeter_capital/siteadmin/userfiles/files/30524859093.pdfIn PDF document text
    • https://towa-aaa.jp/userfiles/file/meniwebazi.pdfIn PDF document text
    • http://itnetworkconsultingsf.com/helpdesk/app/webroot/img/userfiles/files/30501280125.pdfIn PDF document text
    • http://veterinariacasettamattei.it/userfiles/files/36859204741.pdfIn PDF document text
    • https://radio-aurea.eu/files/file/71338110175.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_off0000ba29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA29 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d240.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD240 11164 bytes
SHA-256: 0a423f63fdd73930f1f840912249ef985f12746b24a8c90e530dc790df5a38df
font_02_sfnt_off0000ebd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD9 17332 bytes
SHA-256: e1cc5e6d8cff5252024e719f9bdce17a10b71aae3c4eef7b812d63000a28ddd9

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