Malicious PDF — malware analysis report

Static analysis result for SHA-256 5aa1d8c7f1278457…

MALICIOUS

PDF

74.5 KB Created: 2021-09-15 18:43:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-07
MD5: b6cdc90bccfc943c7c3709ab853c223a SHA-1: 50ea794ad4510eea36058414374ced45830e984d SHA-256: 5aa1d8c7f1278457f307d72bfe16e27b6afd03737dac8cbece351d94aa79879e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URLs, suggesting it is designed to redirect users to malicious websites for phishing or malware distribution. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 https://cructi.ru/uplcv?utm_term=munda+hi+chahida+full+movie+online PDF link annotation
    • https://smartcirclegroup.com/userfiles/file/tasalepuvajofelijapeg.pdfIn PDF document text
    • https://reaga.net/js/ckfinder/userfiles/files/zikenuripisow.pdfIn PDF document text
    • http://paitoonbox.com/userfiles/files/78887750042.pdfIn PDF document text
    • http://qdjshg.com/files/file/bevedujujiguruwoxejesi.pdfIn PDF document text
    • https://datawire.gr/files/files/bizafimujekumubupe.pdfIn PDF document text
    • http://bennett-legal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/66040088382.pdfIn PDF document text
    • http://cinebuzz.be/uploads/userfiles/files/fujejegopal.pdfIn PDF document text
    • https://www.channeloflove.com/ckfinder/userfiles/files/45423940227.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/2efa15cf2537daaa800115d378448519/13398763621.pdfIn PDF document text
    • http://unionnutritech.com/upload/files/76380779651.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/161349c2e043fb---82618664345.pdfIn PDF document text
    • https://aldurra.ly/images-editeur/img/file/60466350424.pdfIn PDF document text
    • http://powerfalcon.net/uppic/files/riwijiwokesuxewefenome.pdfIn PDF document text
    • http://tatagz.com/uploadfile/files/zidewudififep.pdfIn PDF document text
    • https://radiosmile.hu/upload/file/gadozuvekiwarefofi.pdfIn PDF document text
    • http://quocteanviet.com/img-chamthi/files/vuxojugu.pdfIn PDF document text
    • http://zopos.zohukum.com/ckfinder/userfiles/files/rakijov.pdfIn PDF document text
    • http://hidrometa.com/images_upload/files/11541526009.pdfIn PDF document text
    • http://vwtint.com/userData/board/file/nilikewamorelimamiris.pdfIn PDF document text
    • http://safeabortionnepal.com/userfiles/file/sixavasujutoxa.pdfIn PDF document text
    • https://artedeeducar.com.br/ckfinder/userfiles/files/13842570348.pdfIn PDF document text
    • http://stagegator.scorchmark.com/stagegator/ckfinder/userfiles/files/69000210579.pdfIn PDF document text
    • http://twozonechickenlasvegas.com/uploads/files/86547140889.pdfIn PDF document text
    • 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_off0000bf61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF61 10536 bytes
SHA-256: 52d90782aa3d65c6f16545a96698631e80432d0c975da512d12aff95e0104c46
font_01_sfnt_off0000d72a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD72A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ef3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF3C 17580 bytes
SHA-256: e40ccc6b92a3cb5d8d8217eca9b6e5e6a5216e27c3bdf383d739f644b359b239

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