Malicious PDF — malware analysis report

Static analysis result for SHA-256 d81c34e3c2aa49c9…

MALICIOUS

PDF

68.7 KB Created: 2021-01-24 00:14:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 4a314dbbc80c0decb66d03e1bc6eb0ed SHA-1: 93358c70d24e980a46b3604b7a14189ea23a0443 SHA-256: d81c34e3c2aa49c9f6bdb6e6850ab4f927a4f0e8c767beaf160e64e6a04030bb
96 Risk Score

Malware Insights

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

The PDF contains an embedded URI that redirects to a suspicious domain, likely as part of a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics suggest the document is designed to exploit vulnerabilities or trick users into visiting malicious sites.

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://seumenha.ru/123?utm_term=adjective+words+that+start+with+e+to+describe+a+person PDF link annotation
    • https://cdn.sqhk.co/sebutarukaw/ahcj0H0/music_volume_eq_apkpure.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407983/normal_5ff292141bb32.pdfIn PDF document text
    • https://site-1172347.mozfiles.com/files/1172347/dj_mixer_best_dj_music_player.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450037/normal_5feba25d59ce0.pdfIn PDF document text
    • https://cdn.sqhk.co/jugemito/BWJ6gf6/27898332815.pdfIn PDF document text
    • https://cdn.sqhk.co/bomemenun/ihhGgjl/nanironiluna.pdfIn PDF document text
    • https://site-1247010.mozfiles.com/files/1247010/wibidurovirizabox.pdfIn PDF document text
    • https://site-1175480.mozfiles.com/files/1175480/parla_learn_spanish_free_online.pdfIn PDF document text
    • https://site-1171771.mozfiles.com/files/1171771/al_ahly_vs_el_zamalek_today.pdfIn PDF document text
    • https://site-1174957.mozfiles.com/files/1174957/jio_button_mobile_game_free.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480595/normal_5fe1106e8a439.pdfIn PDF document text
    • https://site-1178914.mozfiles.com/files/1178914/66292600514.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443809/normal_5fdd10405655b.pdfIn PDF document text
    • https://site-1234349.mozfiles.com/files/1234349/sosiwogogemelowewejona.pdfIn PDF document text
    • https://cdn.sqhk.co/gogamosujimi/jbhiTkJ/17559496865.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374851/normal_5fe9092472f98.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c394.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC394 5484 bytes
SHA-256: 4dedc0c7e4505085c0e85f69da378dce28be937742dfb4475f7cdf0de59999f6
font_01_sfnt_off0000d646.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD646 3720 bytes
SHA-256: 6539b129c5cd894636dc8f40f53a156c00c8f46378ab4f137c96d687a1cff6ed
font_02_sfnt_off0000e1a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1A9 10424 bytes
SHA-256: a0f766ccddf12b7eea5ac2851866248ba7ebca4c56415d442b9bb2cbedfda1cd

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