Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c9efe6499c80ba5…

MALICIOUS

PDF

72.2 KB Created: 2021-09-19 13:07:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1e74d4cf416d1b4f14c148565d6f5ce3 SHA-1: 7684b637ad0488a080e5174112168b1d98618acb SHA-256: 9c9efe6499c80ba5e14c6f86efc73207af8f16e24fc77717eeaef942f7995c87
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to disposable domains, which is characteristic of phishing or malware distribution. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass security scanners. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://pistant.ru/uplcv?utm_term=free+web+series+and+movies+app PDF link annotation
    • https://nevisnews.com/userfiles/93855618411.pdfIn PDF document text
    • http://www.dkmodels.net/ckfinder/userfiles/files/lamarokasipa.pdfIn PDF document text
    • http://dailygameresult.com/editor/UserFiles2/files/xukivu.pdfIn PDF document text
    • https://www.fyna.com.au/application/third_party/ckfinder/userfiles/files/tetudezojavotux.pdfIn PDF document text
    • http://tv-kitchen.ru/files/files/tetasupepivoxenedoru.pdfIn PDF document text
    • https://tp-pos.com/uploads/image/files/6869082999.pdfIn PDF document text
    • https://thediamangroup.com/_images/files/5478875446.pdfIn PDF document text
    • http://lso-msm.com/userfiles/file/xipala.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144a35166c76---97094218347.pdfIn PDF document text
    • http://nage-z.com/ckfinder/userfiles/files/fukemakidoge.pdfIn PDF document text
    • http://originalbau.hu/imagesfiles/8988994903.pdfIn PDF document text
    • http://phongthuydotho.vn/upload/files/dipamazojatojiniponowa.pdfIn PDF document text
    • https://numen-wow.com/userfiles/cloud/files/lonopu.pdfIn PDF document text
    • http://smart-ventures.ch/upload/Editor_Images/files/xinip.pdfIn PDF document text
    • https://mimpiindah1.com/contents/files/12885373803.pdfIn PDF document text
    • http://indianapit.thriftstorewebsites.net/flash/indianapit.thriftstorewebsites.net/file/rugofasepezinibesov.pdfIn PDF document text
    • http://worldprint.su/userfiles/file/52928391618.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/39901080024.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/161402d488ec94---10543544103.pdfIn PDF document text
    • http://inbeeldt.nl/userfiles/file/9965722251.pdfIn PDF document text
    • 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_off0000b8dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8DD 16644 bytes
SHA-256: f28f057db9da9834102bd5ac68de83841e2d56e8c2bf92429a4dbda2916376e0
font_01_sfnt_off0000e3aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fbc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC1 10680 bytes
SHA-256: 53660726feceacd97be5e90e901180c610b6d0f206a6a92930d0873845e3bd17

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