Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5d00a5c6fb160d6…

MALICIOUS

PDF

72.5 KB Created: 2021-06-05 11:46:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: ab3bf2f4fe148bc50d6b5e8ca55baca8 SHA-1: cccc89ec9d7a8534130b255b631687e537a94a04 SHA-256: a5d00a5c6fb160d604522fa37dabbce1ea73ec43d6200427a7709da6f37d63af
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains an embedded URL pointing to 'soxebez.ru', which is likely part of a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, suggesting it was generated programmatically to appear as a song advertisement, a common lure for phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://soxebez.ru/123?utm_term=fair+and+lovely+ad+song PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4465018/normal_5fdab2466e7df.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490273/normal_606160f41bc18.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447874/normal_601a090cb561d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6c475c0-fe26-44a9-a75b-a58b49c72e89/the_man_without_qualities_vol_2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0004750-99e9-47a4-a858-28a3ad88d165/wigagozexemofinuvo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8dc82280-3fbf-4928-b142-49b116128997/tazidojevefugon.pdfIn PDF document text
    • http://sizolasipape.pbworks.com/w/file/fetch/144574920/bapiwifogefevudenibide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ba174e0-36e8-4178-a05f-82274bd20b82/running_5k_program_beginner.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b20a8539-c45f-4f62-9754-706f1a2bccb4/33228263966.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/388db865-50be-4931-9d58-f9c67dfaf282/the_psychology_of_winning_free.pdfIn PDF document text
    • http://giribuv.pbworks.com/f/mowetobojiwareganudem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1fe15fed-8a14-4cfc-86d8-c95ff388b40e/vewirobidadelasizewiwaza.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f74a7d15-f176-4a68-a5ea-324893367a42/rinojugawedenam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b59a104d-8285-4e4f-a773-bc862fd87638/17187057060.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4065c0aa-0e89-4e85-9faa-74935222d31f/16573627913.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8466c7d8-c44d-407c-ab01-105a0c4fead2/42757259970.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9cec5288-1f71-425a-ad7c-bde07ae9dbe7/java_for_testers_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60292bc6-43c1-47ea-a4d6-d4dbf143d556/67548554358.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2768fec0-863a-4ea8-b238-9ae72c42e3ab/14691910554.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f104118b-e21e-4711-8254-53dfe25223c0/vusafoduvetosekojalar.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_off0000dd55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD55 5112 bytes
SHA-256: e20d986a8200e4d314f677ca168a62e424d450de7a5ff681edcb259176033a6c
font_01_sfnt_off0000eed4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED4 10796 bytes
SHA-256: f5f67d92912e84149a5be6ca68fd3cf1d30f846513502059e50a0b0b177434e5

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