Malicious PDF — malware analysis report

Static analysis result for SHA-256 b33c63bd76686541…

MALICIOUS

PDF

87.7 KB Created: 2021-10-08 05:25:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: 5b51107c6d98cb8e36c443aa0d074359 SHA-1: 5c9256f1972c2aa98f527f1c568b6e3011bc4ea9 SHA-256: b33c63bd7668654182ec777b05e1938f92d1af820dd2ec70033936ae7d705083
96 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and exhibits characteristics of a link farm, with numerous embedded URLs pointing to potentially malicious PDFs on disposable domains. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically flags the use of disposable hosting and a high number of distinct hosts, indicating a likely phishing or malware distribution attempt. The presence of a benign Google feedproxy URL alongside unknown URLs suggests an attempt to blend in or use legitimate services as part of the lure.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4658

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://balony.dmuchance.eu/userfiles/file/sipuwodusuverogise.pdf In PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1614b4c8549a4f---97791388187.pdfIn PDF document text
    • http://1-cities.com/blog_images/blog_/file/59151143571.pdfIn PDF document text
    • https://loonbedrijfschimmel.nl/userfiles/files/37978304629.pdfIn PDF document text
    • http://vdtonline.vn/static/uploads/editor/files/zanewirusidekixikes.pdfIn PDF document text
    • http://ukkies.be/userfiles/file/wimanerilinola.pdfIn PDF document text
    • https://andymullinscommercial.com/home/andy/public_html/ckfinder/userfiles/files/zotabuxixuzumubavi.pdfIn PDF document text
    • http://giasuthienphuc.com/Images_upload/files/96669072372.pdfIn PDF document text
    • http://jumpstart.mobi/userfiles/file/bulil.pdfIn PDF document text
    • http://innovad-ltd.com/userfiles/file/pepadaduzi.pdfIn PDF document text
    • https://edusfera.pl/upload/file/70584512942.pdfIn PDF document text
    • http://signexpowholesale.com/project-new/christianbook/upload_images/file/wimekudozoromasaxebag.pdfIn PDF document text
    • https://careersourcechipola.com/files/public/23535804407.pdfIn PDF document text
    • https://iqmuseum.mn/uploads/files/70446323894.pdfIn PDF document text
    • https://tideandtigers.com/ckfinder/userfiles/files/2652357131.pdfIn PDF document text
    • http://kondicionery-shodnya.ru/upload_picture/file/75793855966.pdfIn PDF document text
    • http://theurbanbazzaar.com/userfiles/file/dakake.pdfIn PDF document text
    • http://jedzenie365.pl/ckfinder/userfiles/files/nilidupifevunifakub.pdfIn PDF document text
    • http://ourpreferred.com/userfiles/files/pakafu.pdfIn PDF document text
    • http://niestachow.pl/data/aktualnosci_imgs/file/33691637219.pdfIn PDF document text
    • http://imi.vc/upload/files/4824784630.pdfIn PDF document text
    • https://giaynangchieucao.com/userfiles/file/79026633783.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=sinners+wanted+full+moviePDF link annotation
    • 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_off0000eff9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010810.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10810 10844 bytes
SHA-256: e30c062bedd6d96ef7655843aafa0e1a132f872016d4b356b2acebc5f1f523a1
font_02_sfnt_off0001211d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1211D 22100 bytes
SHA-256: da5cc14fb5dfeb7cf031c400c70c6953a383a08b9b920994da135f99c8c26bb9

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