Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe5fab0ae6686527…

MALICIOUS

PDF

84.6 KB Created: 2021-09-12 01:45:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: bca4dabe208b10e60eb3cb57a8e9e585 SHA-1: 92a19286a329d80bad6126b2cf921779df523f49 SHA-256: fe5fab0ae6686527bb986f44daf8b253220de649ede8a90d6710c7e877627232
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs pointing to various domains, suggesting a link farm or phishing lure. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a pattern of using disposable hosting for these links, further supporting a malicious intent. While no scripts were explicitly extracted, the nature of the PDF and the heuristics suggest it is designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/fab5a4de3dcb2fd788f79ab63ecf6b63/16098028152.pdf In PDF document text
    • https://pointswestliving.com/ckfinder/userfiles/files/51198457398.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1612f42151898d---65863797837.pdfIn PDF document text
    • http://mikailang.com/userfiles/file/20210908101113_381932302.pdfIn PDF document text
    • http://deltools.com/userfiles/file/sirutetupafo.pdfIn PDF document text
    • http://dsagco.com/Upload/file/rumawebinopudiwinezimelor.pdfIn PDF document text
    • https://halead.com/uploadfile/1631034927.pdfIn PDF document text
    • https://juvelyrikoscentras.lt/Files/file/71240820735.pdfIn PDF document text
    • https://petribax.com/userfiles/file/64803967461.pdfIn PDF document text
    • http://cautrucpalang.vn/webroot/img/files/78893782393.pdfIn PDF document text
    • http://icbiz.ru/userfiles/file/76397175376.pdfIn PDF document text
    • http://ufnk.fr/app/webroot/files/file/45685563648.pdfIn PDF document text
    • http://unseenadventure.com/userfiles/file/6774725724.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133a58e705bc---napuzukubililiwukijigib.pdfIn PDF document text
    • https://mavachhaiphong.com/upload/files/44684131758.pdfIn PDF document text
    • http://hflbdq.com/uploads/file/090628462417.pdfIn PDF document text
    • http://biosystech.com/pdsFck/file/xapujonogalarazuket.pdfIn PDF document text
    • http://www.pethouse.es/ckfinder/userfiles/files/jakurikidagipet.pdfIn PDF document text
    • http://maschimaurizio.it/userfiles/files/boperinetuwebefosi.pdfIn PDF document text
    • http://unibox.lv/files/text/libijaxobig.pdfIn PDF document text
    • http://nfc.soo.jp/file/zejibasijubikofoziso.pdfIn PDF document text
    • http://www.w.radeton.cz/ckfinder/userfiles/files/59176354386.pdfIn PDF document text
    • https://ostrichtours.com/ckfinder/userfiles/files/62820898751.pdfIn PDF document text
    • http://shangyi-pump.com/uploads/file/081111135204.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/92421538367.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=transfer+notepad+from+android+to+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_off0000e5e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fdfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDFA 10576 bytes
SHA-256: 79a33caac7d48ffd6bcd953f02399b639519871aaf73d8e3cd08f854a20d0334
font_02_sfnt_off00011613.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11613 17924 bytes
SHA-256: 0bd1c6915c4bde1b93aa3e3766cbd9a538c15b33528f44cab1e57b5ec7e54161