Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d3e46b7819b7e8d…

MALICIOUS

PDF

78.9 KB Created: 2021-09-09 23:46:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0e39c4287b70d02c75c3b9c8a24a9067 SHA-1: 697d803f842a22bfa003916fdfca218757c861e5 SHA-256: 8d3e46b7819b7e8dff613001c2638d85d81be2a7af02465231fe6dd7a5fbdeb9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many pointing to PDF files on various domains, suggesting a link farm or redirection mechanism. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the interpretation that the document is designed to host and distribute links, likely for malicious purposes such as phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://www.nstoplana.rs/ckfinder/userfiles/files/gevogorifupolu.pdf In PDF document text
    • https://maxlinder.com/admin/assets/ckfinder/userfiles/files/gekadiriwizodibivuwog.pdfIn PDF document text
    • http://foodzipo.com/uploads/userfiles/files/sivemes.pdfIn PDF document text
    • http://rqconsultores.com/userfiles/file/22844336618.pdfIn PDF document text
    • http://tdsns.ru/userfiles/file/riganipore.pdfIn PDF document text
    • http://toroisg.com/public/images/files/mosufifovaneladijap.pdfIn PDF document text
    • http://cdmatik.com/uploads/file/21107657222.pdfIn PDF document text
    • http://china-hold.com/UploadFile/file/20210903134347400.pdfIn PDF document text
    • http://vaynhe.com/upload/files/xukupavonepan.pdfIn PDF document text
    • http://prakseologia.eu/userfiles/file/44428915803.pdfIn PDF document text
    • http://woodlandhills.ilovepokebar.com/uploads/files/zusekigezowala.pdfIn PDF document text
    • http://sirmamedia.com/ckfinder/userfiles/files/5476935970.pdfIn PDF document text
    • http://eatatrudy.com/uploads/files/redosuruwaxokar.pdfIn PDF document text
    • https://cardolf.ro/files/71101666361.pdfIn PDF document text
    • http://chickendaylacrescenta.com/uploads/files/deboxobosozipuwor.pdfIn PDF document text
    • http://stfurnimart.com/file_media/file_image/file/43523666386.pdfIn PDF document text
    • https://porfic.com/fotos/file/rirutojonaziver.pdfIn PDF document text
    • https://komunalno.vrgorac.hr/files/8714976899.pdfIn PDF document text
    • https://coolingrealestate.com/your-home-cleaner/FCKuploads/file/94000846163.pdfIn PDF document text
    • https://billard-hauri.ch/userfiles/file/vubupesapapizuj.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/161315c8b3c637---42503580939.pdfIn PDF document text
    • http://erictex.com/ufiles/files/nugil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=factory+reset+android+using+buttonsPDF 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_off0000cd00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD00 18512 bytes
SHA-256: 7127bd90586d98cbe3e981614b77503c2f236f6533c18f713b2b8d34fd359fb7
font_01_sfnt_off0000fcb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB1 10828 bytes
SHA-256: 140334bb7a342447a21aed422425b11f7ae6a57dbbe0b21e31f382689975b875
font_02_sfnt_off000115ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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