Malicious PDF — malware analysis report

Static analysis result for SHA-256 559a6bb157c0f890…

MALICIOUS

PDF

67.3 KB Created: 2021-09-27 13:34:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6d05971dbb8e796616af6b7877ba123f SHA-1: 121411b5ce44a7de07eb2c374a73a340d613752b SHA-256: 559a6bb157c0f890d84e55ccf995931968fd17cf9f55c981a9671dcdd3572075
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to potentially malicious domains, and the PDF structure suggests it's a link farm designed to redirect users. The presence of external URIs and the overall detection as a phishing trojan indicate an attempt to lead users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://christianklein.eu/Quansis/ckfinder/userfiles/files/xizelutowulapavuka.pdf In PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130bea55fc4e---74587947734.pdfIn PDF document text
    • http://veterina-naslunci.cz/userfiles/file/talevalasezoxixijoza.pdfIn PDF document text
    • http://insuralead.com/userfiles/file/kipikike.pdfIn PDF document text
    • https://paidionresearch.com/userfiles/files/79165245650.pdfIn PDF document text
    • http://konikanarrowfab.com/ckfinder/userfiles/files/78042052201.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/24923163015.pdfIn PDF document text
    • http://www.vljainandco.com/userfiles/files/misuresi.pdfIn PDF document text
    • https://pharma-tools.pl/galeria/file/pizawe.pdfIn PDF document text
    • http://digitalpolicycouncil.org/imagenes/file/xibisokem.pdfIn PDF document text
    • https://www.pactforfamilies.org/ckfinder/userfiles/files/muriboxefiketonesagi.pdfIn PDF document text
    • http://gomientrung.vn/uploads/image/files/zifej.pdfIn PDF document text
    • http://www.hangmandigital.com/files/file/97647192976.pdfIn PDF document text
    • https://www.elshandmadedesign.nl/ckfinder/userfiles/files/7450404267.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/255d852d3bb6fe02c7b8e995321aa370/butulelav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=oxford+modern+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_off0000a700.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA700 15788 bytes
SHA-256: ff4169d9825bdc8d356389d6bd29c824d2b924198cf988071a607ae7bc1f8305
font_01_sfnt_off0000cf5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF5B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e772.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE772 10976 bytes
SHA-256: 0adb7c474a70470ffea80d79d687d21caeac9208e6294ee2da58aaa42c7eb01e

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