Malicious PDF — malware analysis report

Static analysis result for SHA-256 404a2c90bccc8ae6…

MALICIOUS

PDF

84.4 KB Created: 2021-09-08 13:57:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: aa066d78e22a25085b954e97c761cfd8 SHA-1: 6e79decc6ac45cf86166ad56306ad37606b64151 SHA-256: 404a2c90bccc8ae69e61bf9f5c10382307172e75c84dd19e5d8370a9fc7ee958
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with one specifically identified as a link farm on disposable hosting, suggesting an attempt to redirect users to malicious sites. Although no scripts were explicitly extracted, the PDF format itself can embed JavaScript, which is often used to facilitate these redirects or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://edwardfmcgintypa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/betaj.pdf In PDF document text
    • http://tentauto23.ru/ckfinder/userfiles/files/bakok.pdfIn PDF document text
    • http://hanifeugur.com/image/files/17550661702.pdfIn PDF document text
    • https://ndmoyun.com/calisma2/files/uploads/xobowefogevizulujibejema.pdfIn PDF document text
    • http://ucg-eg.com/userfiles/file/nakugatu.pdfIn PDF document text
    • http://vipforiraq.com/userfiles/files/gikegelebifusafaregajo.pdfIn PDF document text
    • http://web5gstore.com/Files/files/64554177380.pdfIn PDF document text
    • http://michael-dhom.com/webseiten/file/84534200397.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/bd21f289409563d289075a9b36e86601/38503504156.pdfIn PDF document text
    • http://hodinovysoused.cz/upload/file/lelubijodimigadi.pdfIn PDF document text
    • http://skrutit-probeg.ru/upload_picture/file/gisujutuni.pdfIn PDF document text
    • http://orem.mn/uploads/files/tiribuxonogugibamepi.pdfIn PDF document text
    • http://studiogeologicotrilobite.com/userfiles/files/17184893947.pdfIn PDF document text
    • https://brawlcall.com/ckfinder/userfiles/files/segisumitexivevixezenopu.pdfIn PDF document text
    • http://jindi2010.com/uploadfile/files/nawezumi.pdfIn PDF document text
    • http://accessibilite-salle-eau.com/ckfinder/userfiles/files/nuteretoxoputatemavufe.pdfIn PDF document text
    • http://clubesquilacoma.com/uploads/files/50392641435.pdfIn PDF document text
    • http://zimmerei-possert.at/69727527859.pdfIn PDF document text
    • https://vinacomvietnam.vn/uploads/news_file/mokusiputoxube.pdfIn PDF document text
    • http://e-district.org/userfiles/file/91785799675.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613083a1eaf0f---dafusemasetonepi.pdfIn PDF document text
    • https://ratoempat.com/contents/files/85429795173.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=bruchrechnung+grundlagen+pdfPDF 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_off0000e06c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE06C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f883.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF883 10572 bytes
SHA-256: f050b25c7b0b80f93654c6818f9cb59a8095d7b3b049fc36cb29464a49225a9a
font_02_sfnt_off0001105c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1105C 19632 bytes
SHA-256: 6eabf8eb7a0f378d4c1c0caa07c5296d7aec7b11350838cfc2ba84b5e0c37f44

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