Malicious PDF — malware analysis report

Static analysis result for SHA-256 27ecd2cea2ea17f0…

MALICIOUS

PDF

93.3 KB Created: 2021-09-18 06:33:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c9cb8367830287f78138a41804fed37c SHA-1: 84287ca15bb72fb7381e370b60dee7bafa4e5df9 SHA-256: 27ecd2cea2ea17f064a34c0c8a97f462aa35bc59b267581fb145c000ba7f81f5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which point to disposable domains and are flagged as a link farm. ClamAV detection and ML classification strongly indicate malicious intent, specifically identified as phishing. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing lures designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://noventa.cz/media/files/file/22073273181.pdf In PDF document text
    • http://soyaksiesta3.com/userfiles/file/pojekexobugikatalofif.pdfIn PDF document text
    • http://studiotecniconuti.it/userfiles/files/mupebolatanemu.pdfIn PDF document text
    • https://goodluckfishing.com/ckfinder/userfiles/files/watufuvoxaluxipumukitakuf.pdfIn PDF document text
    • http://nbc.ua/design/pic/file/17324124498.pdfIn PDF document text
    • http://www.first-classlogistics.com/image/upload/File/surezoretirivub.pdfIn PDF document text
    • http://letsbelegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nemamasuburarovilelinor.pdfIn PDF document text
    • https://www.winsum.frl/ckfinder/userfiles/files/67727395968.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/161372aa38c29a---30230251043.pdfIn PDF document text
    • https://mai-avto.ru/upload_files/file/84541234171.pdfIn PDF document text
    • http://johndanton.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/84005492627.pdfIn PDF document text
    • https://zlato-eu.cz/upload/files/xudemikutisusekovi.pdfIn PDF document text
    • http://air-ned.com/uploads/files/3668230156.pdfIn PDF document text
    • https://karlschool.org/uploads/files/202109160432189278.pdfIn PDF document text
    • http://jiab.net/userData/board/file/9947345818.pdfIn PDF document text
    • http://pilot-market.ru/new/files/file/23369015514.pdfIn PDF document text
    • http://www.biogreeno.com/cms/ckfinder/userfiles/files/xotakuzulajorudetinop.pdfIn PDF document text
    • http://aal.tw/uploads/htmlupload/files/88186216687.pdfIn PDF document text
    • http://vipdiler.ru/files/file/teroja.pdfIn PDF document text
    • http://fireprovietnam.net/luutru/files/19635537101.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/j5moe9j839f6sq1abuvkualpt3/pofazifozofagefemapotis.pdfIn PDF document text
    • https://podimercrm.com/img/files/67289753450.pdfIn PDF document text
    • http://sattosushi.com/uploads/files/48944859221.pdfIn PDF document text
    • https://tigapilar.com/upload/files/99828955464.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=how+do+i+screen+record+on+my+android+phonePDF 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_off000106d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106D0 18296 bytes
SHA-256: 38fa0258de8ff5af0a65bab1a2bb5353ae0d7f7ed53519180abf6a080ae5829d
font_01_sfnt_off00013656.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13656 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014e6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E6D 10824 bytes
SHA-256: fdc7d8e6832f1dccab0ae9db19ac9ecba6cd5804bb1a107eb39ccacc5f959a20

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