Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c9c79b947b7da44…

MALICIOUS

PDF

84.8 KB Created: 2021-09-16 08:22:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 80a6dd6757cd781609e1a073c355c09e SHA-1: 613279b4399b00c95243727b7903e6271eddf83a SHA-256: 4c9c79b947b7da44423ab2def6ebc3274c88578d0ea247bb36b84b98538b66df
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains numerous embedded URLs, many pointing to potentially malicious domains, and is described as a link farm designed to redirect users. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to lead users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9780

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://ruta.hu/ckfinder/userfiles/files/60242743123.pdf In PDF document text
    • http://thangmayedex.com/webroot/img/files/64265176320.pdfIn PDF document text
    • http://belgium-ex.com/images/blog/file/bigagakipubokuvekuso.pdfIn PDF document text
    • https://arhstroi.by/uploads/files/5571026809.pdfIn PDF document text
    • https://profession-your-dr.com/uploads/files/202109151108479538.pdfIn PDF document text
    • http://medi-sen.com/files/files/54087235497.pdfIn PDF document text
    • https://grandiosieventinuziali.it/filesUploads/file/84996162469.pdfIn PDF document text
    • http://spreewaldpension-luebben.de/meineBilderAlbertGrundschule/file/ranomujufafeful.pdfIn PDF document text
    • http://descanso.verareyes.com/ckfinder/userfiles/files/52631531647.pdfIn PDF document text
    • https://bimore.vn/webroot/img/files/raperarujotijafigu.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/0c77509b559ae838f8392f4ccb4fd26c/nijiw.pdfIn PDF document text
    • http://centronegozi.com/public/vizelobefapufisav.pdfIn PDF document text
    • http://barexkft.hu/userfiles/file/5902323805.pdfIn PDF document text
    • http://runwellconsulting.com/file/file/12502102264.pdfIn PDF document text
    • http://www.reeder.ee/files/filemanager/zofix.pdfIn PDF document text
    • http://trungtinjsc.vn/upload/FCK/file/60989258143.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613653efab744---61973269405.pdfIn PDF document text
    • https://mygrind.ie/userfiles/file/tipufezujevifino.pdfIn PDF document text
    • http://www.valaisconsulting.ch/file/dajozakogikuxoxuratal.pdfIn PDF document text
    • http://designklasse.de/ckfinder/userfiles/files/12363312051.pdfIn PDF document text
    • http://eot.mn/uploads/userfiles/files/gixibuvisa.pdfIn PDF document text
    • https://bankubezpieczen.pl/userfiles/file/nabamelemaloji.pdfIn PDF document text
    • https://0900107678.com/upload/file/litagerajebalakimekomubit.pdfIn PDF document text
    • http://ledins.lv/cms/file/xagela.pdfIn PDF document text
    • http://thuduchouse.vn/pics/file/34456021871.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=parallel+space+app+which+countryPDF link annotation
    • http://alessandrotria.altervista.org/areap/ckfinder/userfiles/files/gixulazetuvikesum.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB17 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f324.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF324 1948 bytes
SHA-256: b033f7fcbcd390b2cb396fbb5f03ef01f7ca9afc151f9d9df21604321f961cfa
font_02_sfnt_off0000fc28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC28 10772 bytes
SHA-256: 9f11d46edc1861b806c0d029f8a5c41126297f8e1858c831940e47039503e965
font_03_sfnt_off00011501.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11501 18292 bytes
SHA-256: a604a7cb45f324fb602962b54af73af12289222926b123122c3621b059f1f0b2