Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b3999ca535b2ea3…

MALICIOUS

PDF

80.8 KB Created: 2021-09-16 07:42:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f5dacc4c19e20fb0049d8b90a1a687a3 SHA-1: ec4e78cf6f1ebcbdbecab05be2ff859a6b4cdcc4 SHA-256: 5b3999ca535b2ea3aadf4f8ecc5f25e6bad3ad669e9ce692902f43203b30cd0f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML and ClamAV as malicious, with heuristics indicating it functions as a link farm. Numerous external PDF links are embedded, suggesting a phishing or malware distribution scheme. The presence of many distinct domains hosting PDF files points towards an attempt to obscure the true malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://jjinline.org/file_upload/file/maxevu.pdf In PDF document text
    • http://german-ex.com/images/blog/file/91863668378.pdfIn PDF document text
    • http://curvesncontours.com/userfiles/file/55506270853.pdfIn PDF document text
    • http://bluebiz.kr/userData/board/file/wodumub.pdfIn PDF document text
    • http://writtenmail.com/upload_images/file/79245242006.pdfIn PDF document text
    • http://reliancefla.com/admin/images/file/galediz.pdfIn PDF document text
    • https://roshnaai.com/ckfinder/userfiles/files/lilid.pdfIn PDF document text
    • https://oxfordjsr.com/userfiles/file/danebugomonerapituropef.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1613390bdb1ba2---masenegafugifas.pdfIn PDF document text
    • http://ardeche.proximeo.com/ckfinder/userfiles/files/genepetufuwakadazupopide.pdfIn PDF document text
    • http://cuacuonductudong.com/upload/files/popitokopexutejimixebogol.pdfIn PDF document text
    • http://osteriadelcampanile.com/userfiles/files/32999235621.pdfIn PDF document text
    • http://testpensija.bankai.lv/ckfinder/userfiles/files/jezovesitukonil.pdfIn PDF document text
    • http://minisadik-margaritka.ru/admin/ckfinder/userfiles/files/jerumorokejekejamiwuboj.pdfIn PDF document text
    • https://portugaliaimagyarok.com/ckfinder/userfiles/files/39248936377.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/87798491207.pdfIn PDF document text
    • http://xn--eyt274i.com/upload/files/wemimewozeberijinosa.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/7f87f1c0ee07fd89e0489aa7e64c096f/kexafixigakojit.pdfIn PDF document text
    • http://uitvaartverzorgingsindex.nl/images/uploads/7706452725.pdfIn PDF document text
    • http://jinruily.com/UploadFile/file/20210916033921488.pdfIn PDF document text
    • http://kryotherapie.net/neu/userfiles/file/82639196482.pdfIn PDF document text
    • https://odlingfamily.com/userfiles/file/kenojajitipixamos.pdfIn PDF document text
    • https://alpasol.e-giant.net/upload/files/sofidebuveronitopusejos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=lively+wallpaper+download+androidPDF 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_off0000d9a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9A4 17040 bytes
SHA-256: b0fd3456fc55b7463ca692fd88e1edca2f6e5c96bc9918731bc7f4073340d841
font_01_sfnt_off000105ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E05 10340 bytes
SHA-256: ad42ba73ea5552e1a69d50d8f1301df178d835bb8aab42615aad77fa39303dca

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