Malicious PDF — malware analysis report

Static analysis result for SHA-256 25985cc0128ca060…

MALICIOUS

PDF

74.1 KB Created: 2021-02-23 07:58:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: fa838757408407470b0a511475808cdb SHA-1: e2a189e5e5ed89dfc4b8faf728a47f20c413c73c SHA-256: 25985cc0128ca0602993107972184b8bd2ec0e484605fdd5e564d9fa2714c6ed
154 Risk Score

Malware Insights

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

The file is identified as malicious by multiple heuristics, including a critical alert for a PDF redirector link to 'https://yafferge.ru/wix?keyword=snow+leopard+adaptations+behavioral'. The ML classifier also strongly flagged this PDF. The embedded URLs suggest an attempt to lure the user to malicious infrastructure, likely for phishing or to download further malicious content.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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://yafferge.ru/wix?keyword=snow+leopard+adaptations+behavioral In PDF document text
    • https://cdn.sqhk.co/pibepufas/jgziiib/83093570380.pdfIn PDF document text
    • https://cdn.sqhk.co/gituridewo/bjegfPM/voduxazazeratom.pdfIn PDF document text
    • https://cdn.sqhk.co/xewafazuk/gjjcEie/ocean_survival_3d_raft_escape_mod_apk_revdl.pdfIn PDF document text
    • http://meetsoda.club/givifaruk0m1ym.pdfIn PDF document text
    • https://cdn.sqhk.co/fagojefavap/iiifhg2/tipew.pdfIn PDF document text
    • https://cdn.sqhk.co/mivivezar/jjjerrC/mountain_lion_chases_runner.pdfIn PDF document text
    • https://cdn.sqhk.co/tivinarafuvu/jchfPeG/the_creeps_2_world_4.pdfIn PDF document text
    • http://shoop-fg.ru/first_grade_grammar_worksheets_freettkjl.pdfIn PDF document text
    • https://cdn.sqhk.co/xufojidaju/bYZUkLe/wasiputawuvexijatoladuk.pdfIn PDF document text
    • https://cdn.sqhk.co/fokofike/doZHFge/95957085235.pdfIn PDF document text
    • http://jakartapro.xyz/cash_app_personal_capital1k53r.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471481/normal_5fe76a89643da.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/julexekubaj/digifilefexokuwixuxemiger.pdfIn PDF document text
    • https://s3.amazonaws.com/wotodedaruzuk/mixed_tenses_present_past_future_exercises.pdfIn PDF document text
    • https://s3.amazonaws.com/bugutaj/74201373676.pdfIn PDF document text
    • https://s3.amazonaws.com/nowonovege/bergey_s_manual_flow_chart.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5C5 5444 bytes
SHA-256: db5070b5949cebaefac91c0858674fc710600d154c41b062a2902f0ea25cf951
font_01_sfnt_off0000f84c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF84C 10208 bytes
SHA-256: 0f59f46d30e270a5c4c0eaeacae6e9967f8a9f41e6778c8fef8bea213f13dddc

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