Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4463f12a128e007…

MALICIOUS

PDF

82.0 KB Created: 2021-09-09 03:06:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: eb3976ede0d1decbc232c1840ca073c6 SHA-1: 1b27e0d9a71f1c07c775cff8a4de5df3bf3d5e39 SHA-256: e4463f12a128e0076a8f73d5a3b160543accae70fc49e42b39ff14ce4c28da6a
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is identified as a malicious PDF by multiple heuristics and a machine learning classifier. It contains numerous embedded URIs, with a critical finding being a direct link to an IP address, suggesting a phishing or malware distribution attempt. The PDF structure and the presence of multiple links on disposable hosting indicate a coordinated effort to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/16134f80e84f0c---76514150470.pdf PDF link annotation
    • http://daugiavanthienphuoc.com/media/ftp/file/kevelurowemozigaru.pdfIn PDF document text
    • http://ekachaiguitarist.com/ckfinder/userfiles/files/budukabidudesutozaloked.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/zetirotupozozomokoz.pdfIn PDF document text
    • https://sieuthimayphat.com/ckfinder/userfiles/files/5675530120.pdfIn PDF document text
    • https://airxps.com/userfiles/files/75857872052.pdfIn PDF document text
    • http://profesniprukaz.cz/ckfinder/userfiles/files/vezalomutem.pdfIn PDF document text
    • https://rusepress.com/uploads/wysiwyg/files/jujipu.pdfIn PDF document text
    • https://everestart.com/images/stories/file/pivizavejuba.pdfIn PDF document text
    • https://activsport.ro/userfiles/file/14175383438.pdfIn PDF document text
    • http://incomsistema.ru/ckfinder/userfiles/files/97003491029.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/zakifezufezenakozesovij.pdfIn PDF document text
    • http://teakdeck.pl/files/file/77523327332.pdfIn PDF document text
    • https://www.studiorosaliabusco.it/ckfinder/userfiles/files/45502904588.pdfIn PDF document text
    • https://seltec.io/images/uploads/files/33168746191.pdfIn PDF document text
    • https://tekartltd.com/upload/files/setuwewezizemevugi.pdfIn PDF document text
    • http://usa-ex.com/images/blog/file/gumokapawomivo.pdfIn PDF document text
    • http://thaoduocquyhiem.com/userfiles/image/file/digixugokixi.pdfIn PDF document text
    • http://etalentlink.com/uploadfile/file///2021090312123728.pdfIn PDF document text
    • https://polaria.cz/images/file/92124707233.pdfIn PDF document text
    • http://coomargroup.com/ckfinder/userfiles/files/neloze.pdfIn PDF document text
    • https://www.colline-eternelle.com/ckfinder/userfiles/files/lovefimasumufivelare.pdfIn PDF document text
    • http://ain.proximeo.com/ckfinder/userfiles/files/11964125020.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132f5cc0b6e7.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=hack+onlyfans+accountPDF 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_off0000dbcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBCD 10304 bytes
SHA-256: de6508846739fdeba57edd7efc545a967845c8cf6aa5c02dbb0f70c2e0d2b70a
font_01_sfnt_off0000f337.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF337 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B49 18120 bytes
SHA-256: 3151b22f13487a282a2e0faef86ddae484103fdc781f2583b9500209c7d0a569