Malicious PDF — malware analysis report

Static analysis result for SHA-256 86c95bb53231f9ff…

MALICIOUS

PDF

82.2 KB Created: 2021-09-21 02:16:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 49615be939d255886ff00847c7b9c860 SHA-1: c29c9ea129fb643d680cff73fa6d9765daca0be9 SHA-256: 86c95bb53231f9ffa93d33f682bbf56b25c4e841a0d37d836414fe69846637ad
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of numerous embedded URLs pointing to other PDF files suggests a link farm or redirection scheme, likely for SEO poisoning or to host further malicious content. The document body was unreadable, but the heuristics strongly indicate a phishing or malicious redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://drairtools.com/ckfinder/userfiles/files/vimusowisizomuvi.pdf In PDF document text
    • http://educasters.co/ckfinder/userfiles/files/43602737729.pdfIn PDF document text
    • http://alrabbanoilandgas.com/file/files/nesoxogawafavawixune.pdfIn PDF document text
    • http://belloverde.net/emailer/file/87179637623.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/25540767658.pdfIn PDF document text
    • http://pngroup.pl/ckfinder/userfiles/files/45561253755.pdfIn PDF document text
    • http://sangjeom.com/userfiles/file///71863420819.pdfIn PDF document text
    • http://otworz-biuro-podrozy.pl/userfiles/file/12106839551.pdfIn PDF document text
    • http://hocomesun.com/upload/tovifulofalotikomefa.pdfIn PDF document text
    • http://agrion.org/upload/fichier/reritemodatisidewuvoza.pdfIn PDF document text
    • https://carparts-fixture.com/file/file/98875493691.pdfIn PDF document text
    • http://lammensfilip.be/uploads/files/xedonofasapamobef.pdfIn PDF document text
    • http://captainkillmite.com/uploads/files/202109210606562524.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/161372bb2280e2---1449790319.pdfIn PDF document text
    • http://amongelite.com/ci/userfiles/files/mekud.pdfIn PDF document text
    • http://dolekkoyum.com/admin/UserFiles/file/sikezerigakivo.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/09ba59fe8acbd4705e45dd23738a6dc9/zorofuvo.pdfIn PDF document text
    • https://cauthinh.com/luutru/files/40506092945.pdfIn PDF document text
    • https://vinadesigndanang.vn/uploads/image/files/zutexubevala.pdfIn PDF document text
    • http://kennycojewelry.com/userfiles/files/202109/1631837267.pdfIn PDF document text
    • http://kxnjl.com/userfiles/files/7867528026.pdfIn PDF document text
    • https://soechi.id/userfiles/file/kubibunawenug.pdfIn PDF document text
    • https://lorus.rs/files/14859494424.pdfIn PDF document text
    • https://presstone.hu/userfiles/file/liwepimopegiporoposipe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=what+is+android+system+webPDF 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_off0000df2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF2D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f744.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF744 10800 bytes
SHA-256: 446a5455619b0a295b29e8041402e281e6bf3d5363fe3a027470876b9554f2ab
font_02_sfnt_off00011009.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11009 16728 bytes
SHA-256: 93244b9ec885188bef9847c53624438221901a961b3229ee762b0c2a13916abc