Malicious PDF — malware analysis report

Static analysis result for SHA-256 22a5d08b2ad8013f…

MALICIOUS

PDF

82.4 KB Created: 2021-09-14 18:56:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9010739c2cda12e5ad8344c077892777 SHA-1: e6d6e9fea7dbeada5ba03be78b1213deb26debf5 SHA-256: 22a5d08b2ad8013ff7ef2ddec3f6b8ed67c43057bc3010848c7e1d46edcc52c7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs and is flagged as a link farm on disposable hosting, indicating a malicious intent to direct users to potentially harmful content. The ML classifier and ClamAV detection strongly suggest maliciousness, likely related to phishing or malware distribution. The primary attack pattern involves luring users to a network of linked PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • 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.
  • 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://mq-water.net/upload/92528924186.pdf In PDF document text
    • https://sdhouse.info/ckfinder/userfiles/files/38535583565.pdfIn PDF document text
    • http://pensjonatagat.pl/userfiles/file/bupiladewibi.pdfIn PDF document text
    • https://skywaynepal.com/userfiles/file/nefepud.pdfIn PDF document text
    • http://888spirits.com/userfiles/file/nukup.pdfIn PDF document text
    • http://savytrading.com/userfiles/file/volafeguju.pdfIn PDF document text
    • https://www.auto-ecole-rive-droite.fr/ckfinder/userfiles/files/wotedobokidinazifos.pdfIn PDF document text
    • http://dcbestwings.com/uploads/files/84299013355.pdfIn PDF document text
    • https://csodamalom.hu/files/files/sagibugabupolawusidu.pdfIn PDF document text
    • https://jechrina.gr/FCKeditor/userimages/file/soxoloxe.pdfIn PDF document text
    • http://exito-opakowania.pl/userfiles/file/54878615253.pdfIn PDF document text
    • http://china-engine.net/ckfinder/userfiles/files/94748240129.pdfIn PDF document text
    • http://studiolaviano.it/userfiles/files/18369935880.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613d0ae1200ea---wutamanakolivefati.pdfIn PDF document text
    • https://protrialse.eu/files/files/sajuwagorabukoj.pdfIn PDF document text
    • https://nocenzura.space/web/img/podborky/files/puvajiwogowirufazotososog.pdfIn PDF document text
    • http://sutipatika.hu/userfiles/files/61373075876.pdfIn PDF document text
    • http://24x7taazasamachar.com/assets/ckfinder/core/connector/php/uploads/files/59221586402.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///40413302635.pdfIn PDF document text
    • http://tkhomedeco.com/assets/uploads/ckedit/files/20210904073018.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/67420f7ae91da107227b79aafe12f596/75593030593.pdfIn PDF document text
    • http://njchemland.com/upload/files/1478863558.pdfIn PDF document text
    • http://ingfrimale.com/userfiles/files/fogidotimukuse.pdfIn PDF document text
    • https://ismet.com.br/ckfinder/userfiles/files/77689582534.pdfIn PDF document text
    • http://gewald.ru/content/Files/32469766013.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=mi+4a+latest+updatePDF 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_off0000dd80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f597.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF597 10232 bytes
SHA-256: d736faab376fba052f9f66c55c97c63bb81ad4251f57d59ecb4e08c7371690b1
font_02_sfnt_off00010cb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CB6 18376 bytes
SHA-256: 17ede9b9df557b80cfa893f7b9e37350e6a36f9225911047edf5b16dc91593a4