Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f268e82abbdac70…

MALICIOUS

PDF

79.5 KB Created: 2021-09-12 00:52:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e9b55245a3455f77aa872b8c667aeede SHA-1: 715cd1b905eaeda61103fd561b6e66b79006a4dc SHA-256: 8f268e82abbdac70603762b15a1f9c2e26685cfb9319100eadf73c3bd278b278
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous external URIs, many pointing to PDF files on potentially disposable domains, suggests a link farm designed to redirect users. While no scripts were explicitly extracted, the PDF structure and the nature of the URLs point towards a phishing or malware distribution scheme, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://worldmedglobal.com/userfiles/files/ronowisasapuka.pdf In PDF document text
    • http://ugrctrani.it/userfiles/files/24916596715.pdfIn PDF document text
    • http://sun-green.de/ckfinder/userfiles/files/wukoxowiwu.pdfIn PDF document text
    • https://automatisme-portail-bordazzi.fr/userfiles/fichiers/61104597123.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/munetujixudutesuzilatis.pdfIn PDF document text
    • http://haustechnik-hagenauer.at/guronezupenofapodipu.pdfIn PDF document text
    • http://ohxto.com/uploaded_files/userfiles/files/44047536052.pdfIn PDF document text
    • http://www.cerel.eu/images/wyswig_images/file/retetuvuwim.pdfIn PDF document text
    • http://hardiebase.com/uploads/assets/filefile/kajoxune.pdfIn PDF document text
    • http://alda.pl/ckfinder/userfiles/files/kimanuwufav.pdfIn PDF document text
    • https://sreekanakananda.com/ckfinder/userfiles/files/48462603079.pdfIn PDF document text
    • http://www.yankey.com.tw/demo/public/editor/ckfinder/upload/user_upload/files/xejamikowed.pdfIn PDF document text
    • http://kasaitogo.com/uploads/files/jadofuvapologalibuxexi.pdfIn PDF document text
    • http://shengyaweb.com/uploadfile/file/2021090819483312.pdfIn PDF document text
    • https://bk.knu.ac.kr/ckfinder/userfiles/files/zutemenaz.pdfIn PDF document text
    • http://veganogle.es/uploads/ckfinder/files/77777812504.pdfIn PDF document text
    • https://highendteen.com/userfiles/files/lilumosavebebefisebomox.pdfIn PDF document text
    • http://packamate.com/userfiles/guxubap.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef03f78336---39530448459.pdfIn PDF document text
    • https://vrrc.heart.net.tw/ckfinder/ckfiles/files/lugunexesujawaza.pdfIn PDF document text
    • http://kfbma.org/files/fck/file/sitamugemosevafij.pdfIn PDF document text
    • http://ecohouse-lab.de/userfiles/file/11523636747.pdfIn PDF document text
    • http://thelifelesson.net/home/tappingchanges/public_html/dowalumniusa/ckfinder/userfiles/files/87242669383.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=unblock+me+premiumPDF 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_off0000d242.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD242 10444 bytes
SHA-256: 59f8835e6e9be0196857da94b1e09cb76421ff1f23accf0e75e0de55fd8d6a08
font_01_sfnt_off0000e998.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE998 17764 bytes
SHA-256: d011b69434845c4d7ccf9e478fe45d56061d66ab9f14e822d8f0b3c7bfbae12a
font_02_sfnt_off0001178d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1178D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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