Malicious PDF — malware analysis report

Static analysis result for SHA-256 92a4d14936b63d8c…

MALICIOUS

PDF

75.6 KB Created: 2021-09-19 14:18:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: cc30c6d18bfc4347eba89e6006f44936 SHA-1: 3c37a4b5ddda1e9c9621a592dfe816e023d4f452 SHA-256: 92a4d14936b63d8c45cfaa985a808a82c1905d75ddbb7b932a7b1b7d9436632d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as a link farm, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 http://maremio.ru/admin/ckfinder/userfiles/files/14551542918.pdf In PDF document text
    • http://sdes.in/uploads/31616894328.pdfIn PDF document text
    • http://karlsbach.de/userfiles/files/24178930046.pdfIn PDF document text
    • https://perfecthospital.net/FCKeditor/file/83136822831.pdfIn PDF document text
    • http://donahoelawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fufuxez.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/73262609393.pdfIn PDF document text
    • http://compsult.net/userfiles/file/dosevosotibotejod.pdfIn PDF document text
    • http://fotosvatba.net/userfiles/file/44110286673.pdfIn PDF document text
    • https://oncallanatomist.com/ckfinder/userfiles/files/56235496013.pdfIn PDF document text
    • https://playerpress.com/ckfinder/userfiles/files/zubujamipi.pdfIn PDF document text
    • https://evrenmentese.com/upload/ckfinder/files/tarolanixevelufido.pdfIn PDF document text
    • http://xn--9i1b14lwsg1seumdzsx.com/upload/fckeditor/file/keripanigofopivenokeweni.pdfIn PDF document text
    • https://crbz.ru/userfiles/file/lomimavosibitumukorevej.pdfIn PDF document text
    • http://brmxn.com/userfiles/file/20210905191825_v8m4y6.pdfIn PDF document text
    • http://prompol.com/media/file/8916737415.pdfIn PDF document text
    • https://rpdev.org/ckfinder/userfiles/files/39697407835.pdfIn PDF document text
    • https://cfbadalona.net/ckdata/files/vigiduruta.pdfIn PDF document text
    • http://dungcubepgiangtrinh.com/webroot/img/files/famofinazoxi.pdfIn PDF document text
    • http://travelspace.pl/userfiles/file/13478457055.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613fe92d137df---27644909172.pdfIn PDF document text
    • http://nrgmedia.hu/files/file/90179851117.pdfIn PDF document text
    • http://geteffective.biz/uploadfiles/file/kupokikebakafuwab.pdfIn PDF document text
    • http://sensor4you.com/fckeditor/editor/filemanager/connectors/php/fckeditor/upload/202109/file/5684597550.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613661d82dc94---lopovaburinofinowojuvutu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=words+that+start+with+z+and+end+with+cPDF 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_off0000c550.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC550 10560 bytes
SHA-256: 25e8b09800fe60fabc123d2804653315a4509973db7a3ace20fbe43e66c270f0
font_01_sfnt_off0000dd6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD6E 16852 bytes
SHA-256: 3e6a5b95654166de5762c44a00a829809279a342869749d3b92a6be2726c0398
font_02_sfnt_off0001090a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1090A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1