Malicious PDF — malware analysis report

Static analysis result for SHA-256 c83e421cf1fd736c…

MALICIOUS

PDF

77.4 KB Created: 2021-04-03 22:08:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2600e527bbf7f659726b71c125313d36 SHA-1: 283ecbb41ce56d34c005d608b7054ef5924bfc0c SHA-256: c83e421cf1fd736cde79d1062737a95acfda39d210121fa17fffaa87c5aa6be8
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, suggesting a phishing or content-farming scheme. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://zajinet.ru/123?utm_term=un+report+yemen+war+crimes
    • http://bizbize-yeteriz.org/in_a_titration_what_is_meant_by_the_term_primary_standardr4i9g.pdf
    • http://xufamorazogubov.sportsontheweb.net/the_picture_of_dorian_gray_summary_chapter_16.pdf
    • http://pelopof.iblogger.org/fusionner_mac_sierra.pdf
    • http://pepariravifaza.getenjoyment.net/aqa_a_level_biology_revision_notes.pdf
    • https://pibigetikuke.weebly.com/uploads/1/3/5/3/135387636/4678298.pdf
    • https://raxopukefafifi.weebly.com/uploads/1/3/2/6/132695755/835554.pdf
    • http://savodaveb.22web.org/concentric_reducer_vs_eccentric_reducer.pdf
    • https://mubazujozij.weebly.com/uploads/1/3/4/7/134705676/bogikixul-nuxewiropib-migakolowit.pdf
    • https://nazokorebuvawir.weebly.com/uploads/1/3/0/7/130776058/9965072.pdf
    • https://dituvilabo.weebly.com/uploads/1/3/4/8/134897320/b6e36e70fb3fa.pdf
    • http://hyipinvest.site/19567381781mpqp0.pdf
    • http://wubowobipevoto.mywebcommunity.org/13344225216.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://de99c131-68bf-4271-bcef-cda292486844.filesusr.com/ugd/f5892c_435c06adf4e5422083490d220598a5d8.pdf?index=true
    • https://4ad55601-b8ab-4ae0-bc0e-e90069072326.filesusr.com/ugd/3aca14_219e2f6652424fda9c7790cc9a2dca78.pdf?index=true
    • https://uploads.strikinglycdn.com/files/b9ebdc14-6b70-474c-95a2-e8105478f554/2072036183.pdf
    • http://zomudipanosu.epizy.com/93563465663.pdf
    • https://uploads.strikinglycdn.com/files/3eead98e-4ee6-47a3-b6ce-197346825dcb/the_makers_diet_phase_2_food_list.pdf
    • http://sazurukoxoje.rf.gd/corporation_tax_losses_hmrc_manual.pdf
    • https://4b0cdf75-2e42-4830-99f1-bbdbaec3f661.filesusr.com/ugd/891219_155e21f112244fea99a37cdf4260d68a.pdf?index=true
    • https://uploads.strikinglycdn.com/files/3e7a7e7b-8590-4474-99f7-164708362ae2/can_you_control_a_roku_without_a_remote.pdf
    • http://fuvuvadut.onlinewebshop.net/how_to_record_vhs_to_dvd_on_panasonic_dmr-es30v.pdf
    • http://sefowolo.atwebpages.com/24156754766.pdf
    • https://e8c375fd-b324-4bdf-ad9d-f3cc5643921f.filesusr.com/ugd/4cd51e_06259eaf3d6d4da0b58004d227cfe9f5.pdf?index=true
    • https://uploads.strikinglycdn.com/files/15e3cff2-b151-4e7f-95e4-5a112cb1efe9/sore_spot_on_leg_when_touched.pdf
    • http://monudoxufanexax.rf.gd/zirijolazefasuwudimebanej.pdf
    • https://fe426b01-1dd0-498a-b08e-7ec37e320b94.filesusr.com/ugd/6b45f0_4acd4b8def594564822b449fa832d126.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee4d.bin
b119b4726535ae4a85a2d31338835e875b887efe47d190ec4f6e6a614715ea03		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE4D 5232 bytes
font_01_sfnt_off0001001d.bin
2c44d7e5ccd97ba6692bc9c4459ee2ea24c13113ed306d33419db253fc5e4deb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1001D 11248 bytes

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