Malicious PDF — malware analysis report

Static analysis result for SHA-256 509a8cca81334943…

MALICIOUS

PDF

82.3 KB Created: 2021-09-14 07:15:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a9725862ff137ef60d31431fdbe7b6f1 SHA-1: d70f216c1dabf47415eab5734231e81b74814c92 SHA-256: 509a8cca813349435b336c117069b53e4f7e17f968d9146c92f74df1f86448fb
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic analysis identified it as a link farm with numerous disposable domains, suggesting a phishing or malware distribution scheme. The embedded URLs point to various unknown domains, reinforcing the attack pattern of directing users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://jamones-luna.shopcloud.es/ckfinder/userfiles/files/94936579803.pdf In PDF document text
    • http://dlevitin.ru/fck_editor_files/files/96513146445.pdfIn PDF document text
    • http://arebiatours.com/uploads/files/vixolale.pdfIn PDF document text
    • http://louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/23702352335.pdfIn PDF document text
    • http://baoveantam.info/upload/files/nalinuvonatuzozugapida.pdfIn PDF document text
    • http://andersonlawdecorah.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/27591754218.pdfIn PDF document text
    • http://www.fishandcosolicitors.com/uploads/files/72733074677.pdfIn PDF document text
    • http://www.udelimpa.es/ckfinder/userfiles/files/32814852816.pdfIn PDF document text
    • http://xn--or3bo5mvlb.com/data/editor/file/14515390741.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/161353c0d60d19---sabawe.pdfIn PDF document text
    • https://nibrasimansch.com/userfiles/files/fefakagisedivawusijudi.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/1c03552f2c2f368e50f59007f2b68bff/butiritegisasadunulumet.pdfIn PDF document text
    • https://www.larche-de-jules.fr/ckfinder/userfiles/files/bikalazuto.pdfIn PDF document text
    • https://ratosatu.com/contents/files/27991641087.pdfIn PDF document text
    • http://eastcoastbiker.de/sites/default/files/file/kowususuroburi.pdfIn PDF document text
    • http://mezon.jp/userfiles/file/27380470761.pdfIn PDF document text
    • https://reitinguok.lt/userfiles/file/xoralikiliki.pdfIn PDF document text
    • https://daks-96.com/f/uploads/files/94074928047.pdfIn PDF document text
    • https://atpl.aero/ckfinder/userfiles/files/19128499363.pdfIn PDF document text
    • http://integrotech.com/zdjecia/file/44661497249.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=android+last+used+appsPDF 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_off0000de81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE81 10464 bytes
SHA-256: 0d2ff9d268e1443857ea505ca58942f7ae3fd8e577f5b9ac508dc006a4a46b45
font_01_sfnt_off0000f65a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF65A 17672 bytes
SHA-256: db22cc3b054417e1057d3e9a728c5f0df155aacb94e6207df536fbd9774e4d7e
font_02_sfnt_off00012446.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12446 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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