Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4a5e5771e1e81e0…

MALICIOUS

PDF

90.4 KB Created: 2021-01-25 20:41:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 2d3721b7f6362cc816d9ffa0fd2921dd SHA-1: 9767a38f74d637a2bc813b6beb67d420899896d5 SHA-256: c4a5e5771e1e81e0371d279153b5fbf82dd9af66abf9a838d54446b8c07125da
96 Risk Score

Malware Insights

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

The file is a PDF document that contains an embedded URL pointing to a suspicious domain. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URI suggest an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://jottigo.ru/aws?utm_term=dfsadmin+report+command PDF link annotation
    • https://cdn.sqhk.co/zebapomiz/jdifFCf/virus_prank_app.pdfIn PDF document text
    • https://cdn.sqhk.co/tokititagiwe/Oigjche/60577735971.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460048/normal_5ffdb58bc15a8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369322/normal_5fe5a59e1df49.pdfIn PDF document text
    • https://cdn.sqhk.co/kavejufa/drPgjgi/91209753189.pdfIn PDF document text
    • https://cdn.sqhk.co/ralapogifur/eIWFjaP/2020_pinball_price_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/kedezoge/gohhjHA/new_york_city_fc_soccer_score.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/gudukupir/personality_assessment_inventory_sample_report.pdfIn PDF document text
    • https://s3.amazonaws.com/falevi/freeride_games_for_android.pdfIn PDF document text
    • https://s3.amazonaws.com/nakevoja/65251182192.pdfIn PDF document text
    • https://s3.amazonaws.com/midaguvimabof/sawuzajadiwurew.pdfIn PDF document text
    • https://s3.amazonaws.com/genedesowul/blinkist_premium_mod_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/pusolefosex/zarodexusesarutasugu.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE03 6588 bytes
SHA-256: 4e1a9c4cb32f1bc4ff176ae4dc1460c31b2d267bf2def0252f23ad2731e7be72
font_01_sfnt_off0000fe7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE7C 5268 bytes
SHA-256: 0c5c0e0e4af2d4e89d0b48468da340464d80e0be5625a57be32ea617b1269b10
font_02_sfnt_off00011057.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11057 5600 bytes
SHA-256: afb5cd54a039063f141ec7428b3c85fdbce788d77fdddbd02ebd36622000755e
font_03_sfnt_off00012170.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12170 10664 bytes
SHA-256: 52272d19636dfab3bfd060f7f8937eb5dc58c5e4ef6d750e996c9b9f7a99e860
font_04_sfnt_off00014627.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14627 16188 bytes
SHA-256: fe8de2f20f582cf02a465db24768d053cab1b265770a8908959c8d579d4d579c

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