Malicious PDF — malware analysis report

Static analysis result for SHA-256 b81b5a8afa8ea828…

MALICIOUS

PDF

75.9 KB Created: 2021-03-20 13:31:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6177ea41087d48efe198a2cfa2bd03ff SHA-1: b80b5a72cec344cdaccee8d48b8980cbb7016683 SHA-256: b81b5a8afa8ea828664751473043ee3f29c177ddc62d606d60ebf7943a55072c
96 Risk Score

Malware Insights

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

The file is a PDF document flagged as malicious by ClamAV and an ML classifier. It contains an embedded URI pointing to 'zajinet.ru', which is likely a phishing or malware distribution site. The document body, though heavily obfuscated, contains keywords related to vehicle maintenance, suggesting a lure to entice users to click the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://zajinet.ru/wix?keyword=spark+plug+reading+e85
    • https://static.s123-cdn-static.com/uploads/4483855/normal_6005b0f8e26ac.pdf
    • https://cdn-cms.f-static.net/uploads/4449193/normal_5fd68682b5928.pdf
    • https://cdn-cms.f-static.net/uploads/4459323/normal_60299484c59b3.pdf
    • https://cdn-cms.f-static.net/uploads/4485162/normal_601bcbee5c765.pdf
    • https://cdn-cms.f-static.net/uploads/4485705/normal_6044c5318bb07.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/jivagajamav/pride_scooter_victory_10_owner_s_manual.pdf
    • https://s3.amazonaws.com/gekojulog/how_the_bible_speaks_to_us.pdf
    • http://dixorinatedav.rf.gd/sutadijozur.pdf
    • https://s3.amazonaws.com/zunaduxa/baby_names_in_malayalam.pdf
    • https://s3.amazonaws.com/gonasidupij/odia_dj_bhajan_free.pdf
    • https://s3.amazonaws.com/dubiditiginowo/bisewugumidozedinuvuvopi.pdf
    • https://s3.amazonaws.com/wexoteluwag/clear_search_history_android_internet.pdf
    • http://vegiroromofi.rf.gd/xeropagakadomap.pdf
    • https://s3.amazonaws.com/sedowedi/7738365454.pdf
    • https://s3.amazonaws.com/pubopelej/corcoran_mn_police_reports.pdf
    • https://s3.amazonaws.com/vosimalume/chi-tsong_chen_linear_system_theory_and_design_solution.pdf
    • 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_off0000ebcf.bin
8ef27b66e121bc36fffff1763d3809bb41f123a980ddc00f98ef4ab75e015904		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBCF 5432 bytes
font_01_sfnt_off0000fe5a.bin
874f67b47a4a5945a5373a5fdfb7b5d07e73bdb5a661bde22d296a4f3cab38af		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE5A 10692 bytes

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