Malicious PDF — malware analysis report

Static analysis result for SHA-256 32f82b28e9d1081b…

MALICIOUS

PDF

81.0 KB Created: 2021-09-09 11:52:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c199df465798fbecf02c64a9d9997813 SHA-1: 108d8ca2d2a66800dc20da8f98bca90c95811d0b SHA-256: 32f82b28e9d1081b46346701c64b93682ac57ce0988da177c743b7b4801500a0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to other PDF files on distinct domains, indicating a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malicious content. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a spearphishing attachment used to lure victims to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 5

  • 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.
  • 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.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612f5cb81a440---rigonakuvixisepa.pdf In PDF document text
    • https://youkuvpn.com/upload/files/50028543665.pdfIn PDF document text
    • https://fiscconsulting.com/userfiles/file/tunuwukajokevasanebifanum.pdfIn PDF document text
    • https://adtw1.elfjane.com/ckfinder/userfiles/files/pekezezivasosap.pdfIn PDF document text
    • http://ipsaix.com/ckeditor/ckfinder/userfiles/files/8740386558.pdfIn PDF document text
    • http://navigator-nsk.ru/userfiles/file/10175635916.pdfIn PDF document text
    • http://www.sictombbi.fr/ckfinder/userfiles/files/36240712096.pdfIn PDF document text
    • https://manualismedicina.hu/fileok/file/75258500226.pdfIn PDF document text
    • https://empresa-venta.hr/files/11343951517.pdfIn PDF document text
    • https://novahealthclinic.ca/userfiles/file/mokeduronixiniketuwoloz.pdfIn PDF document text
    • http://2013.letnifestiwal.pl/ckfinder/userfiles/files/6810221026.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/46319986883.pdfIn PDF document text
    • https://cursosadistanciayonline.com/medios/files/gozoravigalumime.pdfIn PDF document text
    • https://hkpefa.org/editor_upload/file/giliguwarolukoduj.pdfIn PDF document text
    • https://idealist.ro/userfiles/file/kuvuja.pdfIn PDF document text
    • http://gensugroup.com/upload/files/dupuv.pdfIn PDF document text
    • http://origo.ws/userfiles/file/94576989551.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133525c8f88b---biveburezebafusajajomas.pdfIn PDF document text
    • http://ulv-fogger.ru/d/files/59684485391.pdfIn PDF document text
    • http://winhazel.com/indigo/ckfinder/userfiles/files/milorifolisewixifaxafex.pdfIn PDF document text
    • http://kingsfci.com/userfiles/file/dutuxegokepofixiwewibi.pdfIn PDF document text
    • http://epilia.com/upload/FCKEditorfile/32007431728.pdfIn PDF document text
    • http://nationalherbo.com/userfiles/file/49972761537.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=una+pasion+rusa+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_off0000d831.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD831 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f048.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF048 10320 bytes
SHA-256: 83508e94d1b4a5565646ba54bcd92b7ea2460cc70704da277050b5d42f1ad99c
font_02_sfnt_off000107a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107A1 18864 bytes
SHA-256: 68090dc8cf455fe09eb7126660c896a219ff605215a51f3cc9df4816f1fc98b2