Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2a1aaaf21abefde…

MALICIOUS

PDF

79.7 KB Created: 2021-09-17 21:33:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 34ff4db3a5b6ee0a7f21a07492e089c6 SHA-1: 08275e2808a6ee0ec8628ac36176d76ed53db51f SHA-256: d2a1aaaf21abefde4f27b6d08f49efbbcc52bde98b31033d5055ab2408553fb9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to domains that appear to host PDF files, suggesting a link farm or redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 https://thietbivesinhanhhuy.com/asset/files/94500029049.pdf In PDF document text
    • https://horkolas-gatlas.hu/ufiles/file/satoxujofokibikazilisafax.pdfIn PDF document text
    • http://droneducational.com/admin/userfiles/file/gixofibetemuvidug.pdfIn PDF document text
    • https://irantruck.ir/data/file/78342531115.pdfIn PDF document text
    • http://forglass.sk/userfiles/file/88059640091.pdfIn PDF document text
    • https://zippy-inc.com/app/webroot/userfiles/files/5565621453.pdfIn PDF document text
    • http://lblussana.it/images/file/34981829767.pdfIn PDF document text
    • http://restavratorstvo.com/ckfinder/userfiles/files/vaxofukigafu.pdfIn PDF document text
    • http://sicompk.com/survey/userfiles/files/72623479012.pdfIn PDF document text
    • https://acrgruppe.de/userfiles/file/43663876368.pdfIn PDF document text
    • http://elementsgogreen.com/userfiles/file/vegoja.pdfIn PDF document text
    • https://extremedriveline.com/ckfinder/userfiles/files/52851606822.pdfIn PDF document text
    • http://assessmentinsight.com/ckfinder/userfiles/files/ziganizezifabanitotobilo.pdfIn PDF document text
    • https://adeptos.clevercloud.pt/images/items/files/74616309110.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/wimamavuja.pdfIn PDF document text
    • http://vino-charlie.cz/userfiles/file/bamixaveda.pdfIn PDF document text
    • http://gymostrov.org/gymostrov/userfiles/file/nadavofituwekixir.pdfIn PDF document text
    • http://saveondealz.com/ckeditor/ckfinder/core/connector/php/uploads/files/zoperesir.pdfIn PDF document text
    • http://sanfrancescovet.com/userfiles/files/17477905709.pdfIn PDF document text
    • https://tefen67.com/userfiles/files/makesiniz.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613023359ae1f---nisabir.pdfIn PDF document text
    • http://novosib-sport.ru/ckfinder/userfiles/files/zofika.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/94f275d8f862ec0ad7ab0452c54fb9f1/81276068606.pdfIn PDF document text
    • http://zelene-centrum.cz/webpagebuilder/ckfinder/userfiles/files/karobawiriligebex.pdfIn PDF document text
    • https://pfollowers.com/ci/userfiles/files/gejugolasexudariwa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=android+wont+download+apps+from+google+playPDF 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_off0000d676.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD676 16004 bytes
SHA-256: cccabe38dcbbadbbba2de9b2579136b46733312cf73ce6a6d5814a455c59527b
font_01_sfnt_off0000ff75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF75 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001178c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1178C 11020 bytes
SHA-256: 0a71b898fa962c16db9be02300d34a41ccd8cd86b9dc6e715dc8d1ebd8a04ac7