Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bdc9175e27688c1…

MALICIOUS

PDF

78.9 KB Created: 2021-09-18 14:16:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3ccdc1ec9d3c75cf603b59228e954989 SHA-1: b919222b1c225ee32b40a091b847b5086a5ed3b0 SHA-256: 3bdc9175e27688c163654be780ea97f110a26d1bcf7ad0c3539cdbb8c56af790
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. The document contains a link farm hosted on disposable domains, a common tactic for phishing lures. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 https://www.kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/82986614898.pdf In PDF document text
    • http://anduong-nhatthanh.com/uploads/news_file/11276304374.pdfIn PDF document text
    • http://www.amanuttarakhand.org/ckfinder/userfiles/files/xodijawiketunevizup.pdfIn PDF document text
    • http://xn--jt2b56wn0ap2a.com/upload/file/202109140948411291.pdfIn PDF document text
    • http://samnakthodrahassob.com/userfiles/file/80719183870.pdfIn PDF document text
    • http://nsk-nalogov.net/upload/files/badizogajafurazu.pdfIn PDF document text
    • https://palet-school.com/files/files/15892077924.pdfIn PDF document text
    • http://medical-1669.com/userfiles/files/vekakeline.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161442759917be---12626455081.pdfIn PDF document text
    • https://bedandbreakfastchia.it/userfiles/file/80095559352.pdfIn PDF document text
    • http://bacvietexpress.com/upload/userfiles/files/jifuxidisineramuruzawi.pdfIn PDF document text
    • http://chinalabware.ru/d/files/gopefowevesiredavux.pdfIn PDF document text
    • http://baoveantam.org/upload/files/jexatorojoku.pdfIn PDF document text
    • http://ccspatti.org/userfiles/file/46399038891.pdfIn PDF document text
    • http://pribatu.lamilagrosaimport.com/images/files/juvazimubeteme.pdfIn PDF document text
    • http://www.petercar0937494634.com/upload/img/files/98912775740.pdfIn PDF document text
    • https://www.hkha.org/ckfinder/userfiles/files/wajejewek.pdfIn PDF document text
    • http://queenart.kr/userData/board/file/powewejumavupaxime.pdfIn PDF document text
    • http://harckocsik.hu/userfiles/file/repufupex.pdfIn PDF document text
    • http://cmrivestimenti.com/userfiles/files/85340656525.pdfIn PDF document text
    • http://getwealthythisyear.com/ckfinder/userfiles/files/nigexit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=binney+tremaine+galactic+dynamics+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_off0000cf75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF75 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e78c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE78C 11012 bytes
SHA-256: ab2d4dd748187b3fc183b38edc006087eb66fba10f55478f443458348898d2b6
font_02_sfnt_off000100ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100EE 17108 bytes
SHA-256: cf047232a378a20e61398f60660e533c5c1cf18589fd2a0b5947050a71495acb

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