Malicious PDF — malware analysis report

Static analysis result for SHA-256 d66d5445bda73e27…

MALICIOUS

PDF

87.7 KB Created: 2021-05-20 05:54:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9030a22cd8864154f0e5526f18a3f666 SHA-1: 90ed31ed6bf1fa0115d0db8b327a6c349d9c81b2 SHA-256: d66d5445bda73e271491e442a8fa5fb7e03631b817f11f1b695d105aac1c0dcd
136 Risk Score

Malware Insights

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

The PDF document contains a lure for a product key, combined with a heuristic indicating a password-protected archive handoff. The embedded URL points to a suspicious domain, likely serving as a download source for a malicious payload. ClamAV detection and ML classification further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://pelibifir.ru/strik?utm_term=clave+de+producto+para+office+professional+plus+2019
    • https://cdn-cms.f-static.net/uploads/4382773/normal_605fa677d17b9.pdf
    • https://cdn-cms.f-static.net/uploads/4386828/normal_606ddb799eab0.pdf
    • https://cdn-cms.f-static.net/uploads/4424376/normal_6013053bc113f.pdf
    • https://cdn-cms.f-static.net/uploads/4401971/normal_606959b32a9f1.pdf
    • https://cdn-cms.f-static.net/uploads/4481684/normal_603dc326f2516.pdf
    • https://cdn-cms.f-static.net/uploads/4454968/normal_605b2cd42bbb3.pdf
    • https://cdn-cms.f-static.net/uploads/4387243/normal_6029d7dd8969b.pdf
    • https://cdn-cms.f-static.net/uploads/4426955/normal_60498360b13b3.pdf
    • https://cdn-cms.f-static.net/uploads/4486742/normal_605bbfc6cd7a3.pdf
    • https://cdn-cms.f-static.net/uploads/4417519/normal_602159a6ad151.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/3dcaa814-4f12-4267-97a3-771dcc0c72ba/65672892007.pdf
    • https://uploads.strikinglycdn.com/files/263c0b2a-892e-4311-8efe-5005580609b7/most_popular_spanish_words_in_english_with_hindi_meaning.pdf
    • https://s3.amazonaws.com/rafiralexezol/bunopalitaborojup.pdf
    • https://uploads.strikinglycdn.com/files/8e95cfb1-791f-43e2-881b-967906c2dd55/how_to_reset_nec_dt700_phone.pdf
    • https://uploads.strikinglycdn.com/files/9daf79b4-2517-4a22-812a-925d1af7b9f6/el_pollo_loco_500_calorie_menu.pdf
    • https://s3.amazonaws.com/zuses/29668704870.pdf
    • https://uploads.strikinglycdn.com/files/f5deb9ff-2144-4783-af6b-ef86f94aa878/how_to_be_the_best_medical_office_receptionists_make.pdf
    • https://uploads.strikinglycdn.com/files/3c9aee43-d247-49a9-8d14-17cf5c4d364b/bixemojiloniriwalatipukaf.pdf
    • https://uploads.strikinglycdn.com/files/80c5bfe6-574a-47b6-b886-8c14bccf0e1a/bunijonijizuvolug.pdf
    • https://s3.amazonaws.com/vavejijitatofu/york_diamond_80_furnace_troubleshooting.pdf
    • https://s3.amazonaws.com/benuka/69845051741.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd31.bin
4884760bde35a535aa952a650539355bf1a2071bb4ef4430e8c25062d1d2c1c2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD31 5596 bytes
font_01_sfnt_off00011052.bin
57a81e011ee15c935b000dc277ea5f42bab283b1f264784f826f5715560e76e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11052 12468 bytes
font_02_sfnt_off0001395c.bin
684a3c196e802b4dc45ee85e0d12f41c83d6b6c6a55a83cec5fb8e332ee9aa36		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1395C 16376 bytes

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