Malicious PDF — malware analysis report

Static analysis result for SHA-256 27c05472da23c257…

MALICIOUS

PDF

68.7 KB Created: 2021-09-24 05:08:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5bd84bcb4c69e5175f576ab6ee0faf74 SHA-1: 2bced259de280d73937ea57223c9d95f6a682408 SHA-256: 27c05472da23c257bcae53a4811a5f8483ec9c6c426b427f6a0f09d739185d84
134 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 an embedded JavaScript stream and numerous external URIs, many of which point to disposable domains, suggesting a phishing or link-farming attack. The presence of JavaScript indicates an attempt to execute code, likely to download a secondary payload or redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135928f3b9ec---toguvunulusefon.pdf In PDF document text
    • http://angarakshaksecurity.com/userfiles/file/nixaretazexomuwifo.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613289152189e---77599217365.pdfIn PDF document text
    • https://www.highlandernepal.com/assets/ckfinder/userfiles/files/73886135566.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/51523989096.pdfIn PDF document text
    • http://indemo.pl/Image/files/talatodi.pdfIn PDF document text
    • http://inbeeldt.nl/userfiles/file/10475673450.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614b3858a86a7---wuxuregag.pdfIn PDF document text
    • http://mptech.vn/ckfinder/userfiles/files/19519967518.pdfIn PDF document text
    • http://kaies.cn/upfiles/file/81637850320.pdfIn PDF document text
    • http://jandebruijn.com/uploadimages/files/sewelefujixeguzupojotunot.pdfIn PDF document text
    • http://paintmaster.hu/js/ckfinder/userfiles/files/74365727112.pdfIn PDF document text
    • http://mvsexpo.ru/admin/ckfinder/userfiles/files/nevisov.pdfIn PDF document text
    • http://123dvere.sk/files/file/ladovekojajitobegabitaxi.pdfIn PDF document text
    • http://paletydozahrady.cz/ckfinder/userfiles/files/24509510139.pdfIn PDF document text
    • http://1day2night.com/UserFiles/file/82606007687.pdfIn PDF document text
    • http://olgapolyakova.com/files/files/9219919750.pdfIn PDF document text
    • http://vantaidongsaigon.com/uploads/files/9370979281.pdfIn PDF document text
    • http://atem.sciara.eu/public/upload/file/82479005625.pdfIn PDF document text
    • http://kwiatmetal.pl/userfiles/file/1793780990.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=add+button+in+listview+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_off0000ae27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE27 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c639.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC639 15328 bytes
SHA-256: 300fe72af2de7f60d10a7d49521ab5629b71676aa91ae9bba8808dddc3eaa547
font_02_sfnt_off0000ed25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED25 10612 bytes
SHA-256: e9997d84e22711c7d753c72c0f0f914366a55f465a9d2f56ed299721158f2dd8

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