Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5cbe9989813ea8a…

MALICIOUS

PDF

90.8 KB Created: 2021-09-11 23:18:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7caceb3ef1fc5bbce5d1900519f87351 SHA-1: 7b8fbe78440d0607dc534151833f36e3c663a9a0 SHA-256: a5cbe9989813ea8a686e4881ff580bdb06355a86647e79a7601519687a2c6ebd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to suspicious domains, and is flagged by ML and ClamAV as malicious. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a link farm on disposable hosting, suggesting a phishing or spam campaign. While no scripts were explicitly extracted, the nature of the links and the ML detection strongly suggest a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://pass-eco-energies.com/ckfinder/userfiles/files/rulibes.pdf
    • http://alexandersorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/46564743586.pdf
    • http://auto-spec.ca/fck/file/digijof.pdf
    • https://bahia-group.com/ckfinder/userfiles/files/94432771744.pdf
    • http://ms-beauty.com/ckfinder/userfiles/files/nobil.pdf
    • https://careerroots.net/ckfinder/userfiles/files/dimusigibogedo.pdf
    • https://dubaimotorcycletours.com/uploaded_images/files/xuzagaditopurutubo.pdf
    • https://thediamangroup.com/_images/files/vufoxegubinasepu.pdf
    • http://smenergy.kr/uploaded/file/11939358636130a4af306cb.pdf
    • http://oishisushigd.com/uploads/files/zireg.pdf
    • http://msdoubrava.cz/foto/images/file/70365938465.pdf
    • https://watfordfairtrade.org/app/webroot/img/files/fawusavututisopeb.pdf
    • http://dsfly.com/uploads/files/watukux.pdf
    • http://jrmhandling.nl/upload/file/mipizarerigazazani.pdf
    • https://red-adlay.com/upload/files/pisevezeranojisik.pdf
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0918342da---maderixadetotut.pdf
    • http://veoguidecostarica.com/ci/userfiles/files/kugisisasoviginewom.pdf
    • http://wangyiphk.com/userfiles/nijijo.pdf
    • http://captainkillmite.com/uploads/files/202109120206376399.pdf
    • http://sipzip.com/userfiles/file/14533407091.pdf
    • https://gemicilojistik.com/userfiles/upload/file/worirutatalo.pdf
    • http://gerocuki.hu/user/file/mijomogorevadurasuxi.pdf
    • http://rejs2013.cycling-recycling.eu/imgturysta/files/sezudujikopedak.pdf
    • http://tensoinox.com/userfiles/files/78474894299.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=how+to+get+free+spins+on+house+of+fun
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fff1.bin
d9c273cf7a9d6610fc5815b00412f7f21a1daf9616a01a131ecb0a54784c2596		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF1 17304 bytes
font_01_sfnt_off00012cde.bin
acceb16a158837a63a9f6b4556a1d9144442a353d2442115853d52f29d61a8af		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12CDE 10608 bytes
font_02_sfnt_off00014514.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14514 16792 bytes

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