Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dd2c8dec89d58c1…

MALICIOUS

PDF

70.1 KB Created: 2021-09-27 09:14:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 3c1d6334676b9f44b6ee02afce8c6a9b SHA-1: 766698a4d2613665ef3379f7f7da6a29e594a036 SHA-256: 4dd2c8dec89d58c11ba344f081e0c10dbfe114fb6539309931f46c5c3dd8ea5a
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious. It contains embedded JavaScript, suggesting an attempt to execute code. The document also includes numerous external URIs, forming a link farm, with one notable URI pointing to a potentially malicious domain. The presence of embedded JavaScript and the link farm structure indicate a likely phishing or SEO poisoning attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://adams-gold.ru/archive/image/file/timowujubalawudagibevan.pdf In PDF document text
    • http://machin.kr/userData/board/file/tedazosijoluxitigivizipix.pdfIn PDF document text
    • https://washlounge.in/ckfinder/userfiles/files/tizujewijufofegarisazevu.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/dobujuvupegogomiju.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/161455516b69a9---gotizitazofof.pdfIn PDF document text
    • http://allivecoat.com/userData/board/file/74926518693.pdfIn PDF document text
    • http://www.martiusstaden.org.br/js/ckfinder/userfiles/files/judijiwasaxulip.pdfIn PDF document text
    • https://101doctor.com/uploads/ckfiles/files/6139e318b2097.pdfIn PDF document text
    • https://newsru.md/upload/userfiles/files/64003872002.pdfIn PDF document text
    • http://jinyezi.cn/upload/14235903777.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/sasekojodufurudo.pdfIn PDF document text
    • https://inprovitargentina.com/ckfinder/userfiles/files/tefumuzexekijeto.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d332e8683f---lulukevidoberum.pdfIn PDF document text
    • http://taaltoetsvo.nl/userfiles/file/noxudakop.pdfIn PDF document text
    • http://mylodge-naoshima.com/images/blog/file/4047490564.pdfIn PDF document text
    • http://hadt.vn/upload/files/92467793978.pdfIn PDF document text
    • https://pikhospital.com/ck_uploads/uploads/files/19297626749.pdfIn PDF document text
    • http://hkxhjfc.ltd/uploads/files/20210919074354.pdfIn PDF document text
    • http://gniortho.com/files/Upload/file/niwenutogujexoruxit.pdfIn PDF document text
    • http://inwama4.vn/webroot/img/files/22801655231.pdfIn PDF document text
    • http://studiomanzella.com/userfiles/files/33246239092.pdfIn PDF document text
    • https://isabellepieman.com/userfiles/file/7763114576.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=titanic+movie+online+playPDF 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_off0000af48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF48 16788 bytes
SHA-256: d97e863199e8a258d924633c394d7dd72a570b46d57544ccf0bb713278269867
font_01_sfnt_off0000d9a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f1b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B9 10408 bytes
SHA-256: aaec2696f6506708bdc01bd320430dc7f8a8d0c7a5f5d9cd8a123be0c86556f7

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