Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4e8a0b4c8936629…

MALICIOUS

PDF

88.0 KB Created: 2021-03-27 15:26:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eb699f72a7c4361b807454db373f976e SHA-1: d78efea98a409f79470085e2e0beb3db2f17095e SHA-256: d4e8a0b4c89366297e7e585de1d755c312461983ef9094d3a93c455c511599a1
96 Risk Score

Malware Insights

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

The file is a PDF document identified as malicious by ClamAV and an ML classifier. It contains an embedded URI pointing to 'resalured.ru', which is a strong indicator of phishing or malware distribution. The document body, though heavily obfuscated, suggests it is intended to appear as a PDF file. No scripts were extracted, but the presence of an external URI is sufficient to infer a malicious intent to redirect the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • 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://resalured.ru/award?keyword=century+laminate+star+line+pdf
    • https://cdn-cms.f-static.net/uploads/4450251/normal_6046d2e3df6d5.pdf
    • https://cdn-cms.f-static.net/uploads/4409114/normal_5fe6e2440eaa9.pdf
    • https://cdn-cms.f-static.net/uploads/4371514/normal_602468bac21c2.pdf
    • https://cdn-cms.f-static.net/uploads/4393033/normal_60198d2344f7f.pdf
    • https://cdn.sqhk.co/xibetevoxaj/dhhwflf/zevujaxuxazaseka.pdf
    • https://static.s123-cdn-static.com/uploads/4417024/normal_5fe27311af0f0.pdf
    • https://cdn-cms.f-static.net/uploads/4446166/normal_60419cbbe14aa.pdf
    • https://cdn.sqhk.co/jimevexir/ibkBEhh/photo_warp_app_iphone_free.pdf
    • https://cdn-cms.f-static.net/uploads/4403266/normal_60281cd812ef7.pdf
    • https://cdn-cms.f-static.net/uploads/4385648/normal_601d45d93b404.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/wunupalezozerud/zorotote.pdf
    • https://s3.amazonaws.com/baritexovopa/gelatin_sheets_gold_vs_silver.pdf
    • https://s3.amazonaws.com/jikopot/bideropebulekat.pdf
    • https://uploads.strikinglycdn.com/files/08da96a5-bfb0-4f6f-933a-36990a6ad125/installation_of_church_officers_images.pdf
    • https://s3.amazonaws.com/gapuruxumeg/32047767354.pdf
    • https://s3.amazonaws.com/dekogamik/mansfield_snow_weather_report.pdf
    • https://uploads.strikinglycdn.com/files/3a78125a-2a5a-4340-becb-41165bc6a3a8/used_dometic_air_conditioner_for_sale.pdf
    • https://uploads.strikinglycdn.com/files/8d2d29a0-fe53-41bc-8432-9a4c1c0f9e6c/old_love_songs_chords.pdf
    • https://uploads.strikinglycdn.com/files/3ac7a938-f95f-4936-8f73-9d0a44f2aa8e/sony_dcr-trv310_charger.pdf
    • https://s3.amazonaws.com/mulerux/josumewelu.pdf
    • https://s3.amazonaws.com/daniwodug/ashokan_farewell_solo_violin_sheet_music.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_off00011897.bin
9c3976b54b442bf6c24c962b603f50a5cf76b9b62ab30be0578567e705863c4b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11897 5196 bytes
font_01_sfnt_off00012a2e.bin
c46ae5d750acafbae6f81ca44037c6d799ef6de3f996bcdd8e956557a5c680b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12A2E 11836 bytes

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