Malicious PDF — malware analysis report

Static analysis result for SHA-256 99b93164267888e7…

MALICIOUS

PDF

81.1 KB Created: 2021-09-08 23:05:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 9ff4780b8ee086e47ed5cc415c4baa4b SHA-1: a561f6c2e13a61636340b6a621cd3bd732c229bd SHA-256: 99b93164267888e7f4923c527a375e36b270c423656ba48128e91f338ec1210d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous embedded URLs, many pointing to potentially disposable domains, suggests a link farm or phishing lure. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

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 http://noithatmyhome.com/img/files/202027744.pdf In PDF document text
    • http://vouchertiket.com/airplane/ckeditor/uploads/files/43036870128.pdfIn PDF document text
    • http://dermalab.pl/userfiles/file/53305628501.pdfIn PDF document text
    • http://maintogelonline2.bet/contents/files/11169823029.pdfIn PDF document text
    • http://konditsionery-reutov.ru/upload_picture/file/sebixujepawub.pdfIn PDF document text
    • http://szhlfz.net/upload/1315999774.pdfIn PDF document text
    • http://fcraregistration.com/UploadedData/file/gumutabebujomifedopewo.pdfIn PDF document text
    • http://raffaelecavazzoni.com/userfiles/files/53018699720.pdfIn PDF document text
    • http://doanekeyes.com/userfiles/docs/57426478435.pdfIn PDF document text
    • http://www.mearesandassociatesllc.com/siteuploads/editorimg/file/madunorofezavufojareza.pdfIn PDF document text
    • http://xn--2o2b17g32e8xisqq.com/userData/board/file/matigodorofiwetajolagumit.pdfIn PDF document text
    • http://standartbio.com/fckfiles/file/rexulidoxeziruvamijowufo.pdfIn PDF document text
    • http://scsychem.com/upload/files/28490842448.pdfIn PDF document text
    • https://chokysitohang.com/Uploads/userfiles/files/lesakakugolisitamig.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16132ae5349280---zujaxilekubu.pdfIn PDF document text
    • http://prime-standard.com/piceditor/file/bizudabisafeje.pdfIn PDF document text
    • http://veterinariacasettamattei.it/userfiles/files/11757535033.pdfIn PDF document text
    • http://jimsclub.net/new/board/img_tinfo/file/20210903191110.pdfIn PDF document text
    • http://metallpress.info/files/xelejoninaziberetuwevu.pdfIn PDF document text
    • http://vouchertiket.com/airplane/ckeditor/uploads/files/56149814909.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132736af39fa---92023301773.pdfIn PDF document text
    • https://farmacieitaliane.com/documenti/file/6496915182.pdfIn PDF document text
    • http://cofetariafraguta.ro/UserFiles/file/ziwatebudamalabulixev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=effacer+historique+de+navigation+androidPDF 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_off0000d85b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD85B 11004 bytes
SHA-256: 2ec3e6637e9b36eecd4745d417ee3d8c24f3beeb4bb5f1480b6fdff9c25d641f
font_01_sfnt_off0000f167.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF167 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010979.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10979 18148 bytes
SHA-256: 23df988c180c6df94e6fc0dc2159925714a5987aada2170f479181de16cb69cc