Malicious PDF — malware analysis report

Static analysis result for SHA-256 18df5c3421751b60…

MALICIOUS

PDF

204.2 KB Created: 2021-03-24 07:48:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: a5ab4b3027f989618653975b90d34e5a SHA-1: b1ef4289defa0e6888b01f40d288f8cef6941152 SHA-256: 18df5c3421751b60cbcbc557b842764557dc7c48357bdb1bfd7d0983668058d6
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was detected as malicious by ClamAV and an ML classifier, with heuristics indicating it uses an SEO redirector for a 'free-download phishing' lure. The embedded URL, https://resalured.ru/wix?keyword=bayonne+board+of+education+salary+guide, is the primary indicator of the phishing attempt. While no scripts were explicitly extracted, the PDF structure and detection suggest it's designed to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9903

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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://resalured.ru/wix?keyword=bayonne+board+of+education+salary+guide PDF link annotation
    • http://fumexijana.getenjoyment.net/55006139872.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482188/normal_5fd824f9a2621.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494661/normal_604b7705e8489.pdfIn PDF document text
    • https://tixanesel.weebly.com/uploads/1/3/4/2/134234664/gokapovakidaxow.pdfIn PDF document text
    • http://lipoviwevaja.iblogger.org/jamatoji.pdfIn PDF document text
    • http://fesurowejo.mywebcommunity.org/paulo_coelho_libros_frases.pdfIn PDF document text
    • https://fefodenajefive.weebly.com/uploads/1/3/1/4/131437461/7208941.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366371/normal_5fd7c36e84120.pdfIn PDF document text
    • https://gijowazav.weebly.com/uploads/1/3/4/0/134097260/ab2f16e170.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470696/normal_60293b10133a1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421339/normal_5ff247aa059ba.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mejefelutirarej.epizy.com/rbse_class_11_political_science_book_in_hindi.pdfIn PDF document text
    • http://firiwigisu.atwebpages.com/american_cinematographer_magazine_2020.pdfIn PDF document text
    • https://da54c32a-99c7-4590-8520-800dd2d1cae3.filesusr.com/ugd/7973d2_b5c122fdd8bf424d94b3c33aeff5e16e.pdf?index=trueIn PDF document text
    • http://benamow.myartsonline.com/moto_g6_play_case_otterbox.pdfIn PDF document text
    • http://situwosase.myartsonline.com/94010231280.pdfIn PDF document text
    • http://vomonulesew.rf.gd/zofomosesawexigipi.pdfIn PDF document text
    • https://af431a04-9ebc-4ea4-a98d-45e4ffbfad14.filesusr.com/ugd/485053_09251d2371854be49079de9af3636220.pdf?index=trueIn PDF document text
    • http://mudasaki.epizy.com/69413096886.pdfIn PDF document text
    • https://3ff4c494-4984-418a-b709-7a5c611cca0a.filesusr.com/ugd/adbee0_bfc7e2c974914bdabb902bf3c47293d9.pdf?index=trueIn PDF document text
    • http://numarape.rf.gd/what_are_batteries_fuel_cells_and_supercapacitors.pdfIn PDF document text
    • https://0ccb9a81-bd3c-41bd-bc79-2352350f0e5e.filesusr.com/ugd/95ea6b_3bd42552484a42a29c32f5a94ff5ebee.pdf?index=trueIn PDF document text
    • https://ce83042b-5faf-46b5-bcbb-9b4d05ec7d33.filesusr.com/ugd/a31856_67a2773b7c044837bb477e3e646813d0.pdf?index=trueIn PDF document text
    • http://vonimamodiji.rf.gd/2003_ford_focus_zx5_specs.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://scripts.sil.org/OFLIn 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_off0002cc2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2CC2A 5480 bytes
SHA-256: 398dc94ba1b2632aca03c8c78163e3d0c3e6dfa448c9948e828afa4d1af0f096
font_01_sfnt_off0002dee4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2DEE4 14648 bytes
SHA-256: cb225c43507c807d99a602e335d096008fc3ae630b183d94970a3a35a16bd650
font_02_sfnt_off00030e52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x30E52 16060 bytes
SHA-256: 4ef9506ee11a349461550e6b437e3786686b598308a87786035880d16624999d