Malicious PDF — malware analysis report

Static analysis result for SHA-256 658044c6efa2370d…

MALICIOUS

PDF

710.3 KB Created: 2021-04-18 18:07:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 65ba6c36672556d29203faddd64eaa98 SHA-1: c4e04143c97a529e8545f1c93431a9b982b93f57 SHA-256: 658044c6efa2370da6e0aa42f8a3e24be4f627139d2f555754076f358412771e
96 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, and it contains an embedded URI pointing to a suspicious domain. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect the user to a malicious site, likely for phishing or to download further malware. The presence of multiple unknown reputation URLs further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6824

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://bologen.ru/strik?utm_term=can+you+get+a+flush+in+cribbage PDF link annotation
    • http://trixy-matrix.space/57490418695vbyjd.pdfIn PDF document text
    • http://bumumapa.mypressonline.com/how_much_is_a_big_green_egg_xl.pdfIn PDF document text
    • https://cdn.sqhk.co/pojimisuso/jArvJKA/24524485971.pdfIn PDF document text
    • http://pelososone.22web.org/dark_souls_3_faith_build_strength_or_dex.pdfIn PDF document text
    • https://cdn.sqhk.co/karapazepot/H5gdTmw/bugs_bunny_carrot_hunt_game.pdfIn PDF document text
    • http://jakor.pro/7548587096466az2.pdfIn PDF document text
    • https://cdn.sqhk.co/kifuzopeko/jz2jeuH/ualberta_eclass_support.pdfIn PDF document text
    • https://cdn.sqhk.co/jutafegobexe/UgcifuX/91295343309.pdfIn PDF document text
    • https://cdn.sqhk.co/xisapabo/ii71Hhg/report_lost_driver_license_ca.pdfIn PDF document text
    • http://creditscorerepair.info/25855817551xv5n.pdfIn PDF document text
    • http://rugegav.mywebcommunity.org/67303443741.pdfIn PDF document text
    • http://welitizenowem.mywebcommunity.org/what_words_should_not_be_capitalized_in_a_title.pdfIn PDF document text
    • http://goriwekaparagi.iblogger.org/6962201839.pdfIn PDF document text
    • https://cdn.sqhk.co/zikufojigox/Whahjij/90042340181.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mevalegija.rf.gd/biophysical_society_meeting_2020_program.pdfIn PDF document text
    • https://s3.amazonaws.com/rovuweraja/85803803919.pdfIn PDF document text
    • http://feferabi.atwebpages.com/algebra_formulas_for_ssc_cgl.pdfIn PDF document text
    • http://seroroxunabolu.onlinewebshop.net/88008552651.pdfIn PDF document text
    • https://s3.amazonaws.com/jozaponi/alternative_energy_sources_reading_answer.pdfIn PDF document text
    • https://s3.amazonaws.com/wajufifenoxuj/hana_cockpit_2._0_administration_guide.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_off000ab9b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAB9B0 5288 bytes
SHA-256: 8cf085df97c8e8b83eaca429a8d94d7fb92df8719305a6290d29403a0e6ec626
font_01_sfnt_off000acbc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xACBC4 11088 bytes
SHA-256: b49a0ae33f50946adef404f65e3293448f1bf0cc3a22b84b059ce64e51aa58af
font_02_sfnt_off000af0be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF0BE 16204 bytes
SHA-256: 541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501

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