Malicious PDF — malware analysis report

Static analysis result for SHA-256 772778761e063628…

MALICIOUS

PDF

83.8 KB Created: 2021-09-13 05:57:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c319bb50eaa87ce180dc34fe364e3f7d SHA-1: 206f4063b3e39312abf5601ef014922d935478ea SHA-256: 772778761e063628d0658141d518487068eb0a69f8f4c4eee5170dd9c2815c38
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to suspicious domains and appear to be part of a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a phishing or malware distribution scheme. While no scripts were explicitly extracted, the nature of the embedded URLs and the overall detection suggest it may leverage PDF vulnerabilities or JavaScript to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://timnhanhonline.com/upload/files/61746817036.pdf In PDF document text
    • https://gitedu.in/ckfinder/userfiles/files/bajuvusam.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/b7eef18eb471223d752d8938af4b03c1/84021561280.pdfIn PDF document text
    • https://gionggiacam.gagiongvitgiong.com/ckfinder/userfiles/files/veworenotedalaxaxitokeres.pdfIn PDF document text
    • http://wcsps.com.tw/ckfinder/userfiles/files/bimezepizuverudova.pdfIn PDF document text
    • http://fishngrill.iorderfoods.com/uploads/files/datuwinonuwak.pdfIn PDF document text
    • http://kool-house.com/upload/editor/file/23733181665.pdfIn PDF document text
    • https://luathoanghuy.com/uploads/files/mimarida.pdfIn PDF document text
    • http://talesma.com/E/file/rapowasuretigixi.pdfIn PDF document text
    • https://upbilbao.com/ckfinder/userfiles/files/tatubazinimefax.pdfIn PDF document text
    • http://vititanon.com/user_img/files/zuwozokavutorogir.pdfIn PDF document text
    • http://homeloanz.net/images/e/file/66501147598.pdfIn PDF document text
    • https://ngenadmin2.nextgenphotosolutions-beta.com/app/webroot/files/file/tubukajirijerigize.pdfIn PDF document text
    • http://dd-eng.com/files/files/nekefulelawuvilev.pdfIn PDF document text
    • https://warungmimpishio2.com/contents/files/pakarimulo.pdfIn PDF document text
    • http://cbstav.cz/file/xiwirotekazixetusawitazo.pdfIn PDF document text
    • http://eastwoodfamily.net/userimages/luluwupeluwebuwoxisowil.pdfIn PDF document text
    • http://whuntex.info/userfiles/file/xosuvilep.pdfIn PDF document text
    • http://ks4073.com/file_media/file_image/file/5579458248.pdfIn PDF document text
    • http://atsolution.org/userfiles/file/20210913071522819879150.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/e51d6f6a8f65baca5055096622ba1a68/16458065122.pdfIn PDF document text
    • http://e3edu.vn/public/ckfinder/core/connector/php/connector.phppublic/uploadsfiles/26984131667.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=live+video+lock+screen+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_off0000dc2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC2E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f440.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF440 20532 bytes
SHA-256: f417b63e87e40487179c9a67d6a09fd53ca8cf80b330437e67bfad340bb3e4f8
font_02_sfnt_off000129ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129EA 10380 bytes
SHA-256: b73b015e176aa906d5af6ff91ba4a02c1e02d8a60b64a417b1c7a1ab1d4a2bbe