Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c16c17a9b040e3d…

MALICIOUS

PDF

72.8 KB Created: 2021-09-29 15:02:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 6265f0f3c5cb418471faaf39b206c46b SHA-1: 77dd3cd68f2e1137dcdeb7e805ab5cd529f2335b SHA-256: 6c16c17a9b040e3d5216b39807cbbe088448321a9200fdb7f9dec58f4882a478
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or redirection mechanism. The PDF structure and embedded content, though heavily obfuscated, are consistent with phishing or malware delivery attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://vet-arrighicolangelicristilli.eu/userfiles/files/mojekisusilubipamen.pdf In PDF document text
    • https://hunglivet.com/uploads/files/202109190001198446.pdfIn PDF document text
    • http://goldenstarhotel.vn/images/uploads/files/71217077049.pdfIn PDF document text
    • http://cdkuys.handysociality.com/upload/files/mudikufefeko.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/tofavadoromidotefubavig.pdfIn PDF document text
    • http://svx.su/ffile/file/fuzukokigunokenaf.pdfIn PDF document text
    • http://sorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sexijepafimarewukugutak.pdfIn PDF document text
    • http://miyagi.chi-kara.net/Upload/files/94701666329.pdfIn PDF document text
    • https://confidence-ist.com/ckfinder/userfiles/files/sotivajadatokibokujeko.pdfIn PDF document text
    • http://0975811252cool.linker.tw/files/ralufi.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16151c21ff104d---13407140598.pdfIn PDF document text
    • http://hylimusic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/63296658880.pdfIn PDF document text
    • https://biocenfis.es/uploads/assets/file/niradobozapivi.pdfIn PDF document text
    • http://cutyoursupport.com/userfiles/file/24743436763.pdfIn PDF document text
    • http://akvarium-olbrecht.cz/upload/file/tagavefi.pdfIn PDF document text
    • http://solemarservizi.it/userfiles/files/fuxuxuvetuzerinixigupoxo.pdfIn PDF document text
    • https://amthanhanhsangchinhhang.vn/upload/files/tusasajelidomokujaxabe.pdfIn PDF document text
    • https://inprovitcolombia.com/ckfinder/userfiles/files/penenowe.pdfIn PDF document text
    • http://essentielles-theater.de/UserFiles/File/36787738704.pdfIn PDF document text
    • http://mobilahomedesign.com/userfiles/files/dufibejuv.pdfIn PDF document text
    • http://lenosada.sk/editor_uploads/files/38605393742.pdfIn PDF document text
    • http://tubesealer.com/uploaded/file/12711742836139dc01c9a57.pdfIn PDF document text
    • http://amsuatrust.org/survey/userfiles/files/riropepelelebidegupepi.pdfIn PDF document text
    • http://rockhouseschool.com/rockhouse/uploads/files/falijuvazuwogune.pdfIn PDF document text
    • http://sooam.com/files/fckeditor/file/6765903546153e4d19e05a.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=live+christmas+countdown+wallpaperPDF 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_off0000b7bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7BB 10988 bytes
SHA-256: cc3cbfb9dcdcbec0d32e27567ca1aa5d48676707e00700038ea058377cc3e751
font_01_sfnt_off0000d124.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD124 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e936.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE936 17760 bytes
SHA-256: 166da5d0a8ed2729f86acd71519c6eb73b2ec66c30214f7468848b4f37c1fa92