Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcda6bee38439e4a…

MALICIOUS

PDF

76.8 KB Created: 2021-10-13 23:07:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 1413b4d7ea1774183b16978d744c21ad SHA-1: 5cdc42f8cba400c5caad59eae89646ca0a8b5cd3 SHA-256: fcda6bee38439e4a39727652cd1bce67acf1e1fddcc354f69ca1587dce010f47
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The presence of numerous embedded URLs pointing to disposable domains and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the nature of the heuristics and the embedded URLs indicate a malicious intent to redirect users to potentially harmful 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://xinyaoqiye.com/upload_fck/file/2021-10-12/20211012181357678053.pdf In PDF document text
    • http://sztarmedia.hu/_user/file/notulo.pdfIn PDF document text
    • http://nawooelcs.com/upload/userfiles/2021/10/files/211009150059.pdfIn PDF document text
    • http://dayou.tw/uploadpic/files/202109191822228527.pdfIn PDF document text
    • https://polaria.cz/images/file/zapisapuxuvo.pdfIn PDF document text
    • http://dentherapia.hu/files/file/velawefamewu.pdfIn PDF document text
    • http://hc6999.com/userfiles/files/86504026890.pdfIn PDF document text
    • https://noventa.cz/media/files/file/4917221259.pdfIn PDF document text
    • https://hanakspotrebice.cz/eshop/ckfinder/userfiles/files/7351807735.pdfIn PDF document text
    • https://www.whoamiandwhyamihere.com/ckfinder/userfiles/files/lorixidogegija.pdfIn PDF document text
    • http://casier-a-bouteilles.com/file/wonijakarefokujubixiv.pdfIn PDF document text
    • http://hotelamadeustorino.com/userfiles/files/tujimimuji.pdfIn PDF document text
    • http://amt-alarmy.pl/userfiles/file/90357251506.pdfIn PDF document text
    • http://hylimusic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/7907302353.pdfIn PDF document text
    • https://mmtours.si/uploads/xosotekobe.pdfIn PDF document text
    • https://bushregenerators.net/userfiles/files/goloxekomalegolumakif.pdfIn PDF document text
    • https://ezastupitelstvo.sk/editor_uploads/system/files/zoxasaruzoremedumo.pdfIn PDF document text
    • https://bank-kredit.at/ckfinder/userfiles/files/31122721845.pdfIn PDF document text
    • https://pypconsultores.mx/userfiles/file/pesiwaramusejibi.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/f67a8dd3b83fb2a4e876e1b4728cd75d/vaxok.pdfIn PDF document text
    • http://kapfenberger-schuetzenverein.at/userfiles/file/54031128216.pdfIn PDF document text
    • http://dekogard.net/deko/veri/_files/bavisekurelo.pdfIn PDF document text
    • http://studio-castiglioni.com/userfiles/files/zukuvowozunuviwav.pdfIn PDF document text
    • https://sbsoftware.ro/admin/userfiles/file/zowulokusifuj.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/7xhmvLXWVJc/uplcv?utm_term=can+i+gain+weight+after+gallbladder+removalPDF 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_off0000c6d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6D8 17560 bytes
SHA-256: b2fbeea768fa0419bcb39cd866bd44e6e4318d629a0f6dac6ee927aff94240b1
font_01_sfnt_off0000f49d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF49D 10956 bytes
SHA-256: 547e7174578a7accbd34fa47995351a9972808e5b3a0950bfc3e49b094f212b7
font_02_sfnt_off00010daa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DAA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1