Malicious PDF — malware analysis report

Static analysis result for SHA-256 53e38390a35a4d04…

MALICIOUS

PDF

79.4 KB Created: 2021-09-22 17:26:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a2714eeab91941cdc4d8c910d54047f4 SHA-1: 01c9f199f89c3e2d1b65565957f6042b0c3952da SHA-256: 53e38390a35a4d04abb7f5ac15a6ec5bc33e67611ecb702872d240e1a7e098dd
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and numerous external URIs, many hosted on potentially disposable domains, suggests the PDF is designed to redirect users to malicious sites. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic further supports this, indicating a tactic to obscure the true destination or spread malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://katachizu.com/img/news/files/donawokewuwutojaj.pdf In PDF document text
    • https://sonntag-immobilien.lu/userfiles/files/sirenut.pdfIn PDF document text
    • http://clairvoyantinfotech.com/demo/images/xeduxefivuropo.pdfIn PDF document text
    • http://abwhopewell.com/uploads/files/gubupulozitimuj.pdfIn PDF document text
    • https://pirkitpadangas.lt/ckfinder/userfiles/files/99248222743.pdfIn PDF document text
    • https://idroilektriki.gr/files/file/sujalowagexovifazex.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143812adcee3---18991694705.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16135e17059d1a---27702404952.pdfIn PDF document text
    • https://5udua.com/contents/files/67108022584.pdfIn PDF document text
    • http://ndfeef.com/radiant/mechimobiles/userfiles/files/60869588966.pdfIn PDF document text
    • http://rocb-ap.org/file_media/file_image/file/51975959342.pdfIn PDF document text
    • http://opusincertum.it/userfiles/files/pelagazerilamoveveza.pdfIn PDF document text
    • http://queenart.kr/userData/board/file/882925244.pdfIn PDF document text
    • http://sooam.com/files/fckeditor/file/232584629613f208df327e.pdfIn PDF document text
    • https://responsible-tourism-alliance.com/content_file/files/rikedizatekowakapolid.pdfIn PDF document text
    • https://pearproperties.in/userfiles/file/86853708612.pdfIn PDF document text
    • http://massimosusto.eu/userfiles/files/9407250844.pdfIn PDF document text
    • http://aviapartner.biz/js/ckfinder/userfiles/files/davepagugezifow.pdfIn PDF document text
    • http://itexpertdog.nwoasis.com/upload/files/10886500355.pdfIn PDF document text
    • http://hp-cnc.de/uploads/files/ditigukujunov.pdfIn PDF document text
    • http://aktifithalat.com/resimlerfiles/dixur.pdfIn PDF document text
    • http://bradhelferlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jubotuzajekibabelojamoj.pdfIn PDF document text
    • http://biosystech.com/pdsFck/file/85329524202.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=deployment+diagram+for+android+applicationPDF 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_off0000d58a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD58A 16176 bytes
SHA-256: cf90ed6605a4afa96729ba435c4741bd88bbaf45f7fda3ec4f263fc42d81cede
font_01_sfnt_off0000ff0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF0D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011724.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11724 10912 bytes
SHA-256: 62991e2f335cb44abcc2cc4b6c4fb4adb03898598b959bd294779093fc4f62c1