Malicious PDF — malware analysis report

Static analysis result for SHA-256 8db77aa3128e4bab…

MALICIOUS

PDF

88.9 KB Created: 2021-09-17 15:00:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3a47313c340189a246c48d1f6a066237 SHA-1: 0c4291d83db2b9d04e831f2ec080de1914da9ebd SHA-256: 8db77aa3128e4bab2dd1ccfb7a9cdb26ca028726154ab973ef23a6f6e94be6a7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of numerous embedded URLs suggest the document is designed to redirect users to potentially harmful websites. While no scripts were directly extracted, the nature of the embedded links and the overall structure point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://lishasurgical.in/ckeditor/ckfinder/userfiles/files/binulovadosaketozonag.pdf In PDF document text
    • https://wanfutemple.urwaydesign.com/data/file/userfiles/files/17020964223.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b2cd73b3bb---58363839981.pdfIn PDF document text
    • http://forglory.cz/ckfinder/userfiles/files/nowefewabagedadus.pdfIn PDF document text
    • http://garantc.ru/userfiles/file/zusenazosejuzopaxijotez.pdfIn PDF document text
    • https://cfaegaianascente.pt/portal/userfiles/files/27270904457.pdfIn PDF document text
    • http://ifap.it/images/file/siniwo.pdfIn PDF document text
    • https://mcq.bmtinhoc.vn/InteriorWeb/images/images_news/files/sudobujemaxiti.pdfIn PDF document text
    • https://hostsolutions.ro/app/webroot/files/userfiles/files/95230283564.pdfIn PDF document text
    • http://nfc.soo.jp/file/63305513808.pdfIn PDF document text
    • http://nusratali.com/userfiles/files/12745347631.pdfIn PDF document text
    • http://aerotherminsulation.com/userfiles/file/fukukutikoxovapologode.pdfIn PDF document text
    • http://kamerton.nl/clientfiles/83315332730.pdfIn PDF document text
    • http://circuitoinsulargc.com/documentos/file/sevototuwuzowinali.pdfIn PDF document text
    • https://qualitygums.com/userfiles/file/samazonafuj.pdfIn PDF document text
    • http://jiachuankeji.com/upload_fck/file/2021-9-7/20210907083720157697.pdfIn PDF document text
    • http://1544-7419.net/upload/fckeditor/file/jafiboxop.pdfIn PDF document text
    • https://jnnjhansi.com/userfiles/file/gigutinu.pdfIn PDF document text
    • http://woodlandhills.ilovepokebar.com/uploads/files/67047294820.pdfIn PDF document text
    • http://nuovartea.eu/userfiles/files/gerudoxi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=chal+mera+putt+2+full+movie+download+720p+openloadPDF 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_off0000ef6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF6B 11172 bytes
SHA-256: 91fb863362c2bee2070a8f64bd0ab0c8abcedef4e35cd1d5ff327ed6f2e16d22
font_01_sfnt_off00010975.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10975 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012187.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12187 19760 bytes
SHA-256: b1925e355013823a14359f37ae4ffea9b0fcf515d81e95e418b160ebdecf0bf4

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