Malicious PDF — malware analysis report

Static analysis result for SHA-256 f78fd801a9e60843…

MALICIOUS

PDF

80.4 KB Created: 2021-03-23 16:35:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 470507f7f1db7d37b81f0421fea41804 SHA-1: 21057085810ae92b9310b0848abb9a5ff58c842b SHA-256: f78fd801a9e60843e3348035ed9a7af0c77b67bde00edff2936cdadfd09a185d
96 Risk Score

Malware Insights

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

The PDF file contains an embedded URL that leads to a domain associated with malicious activity, as indicated by the ML classifier and ClamAV detection. The document body, though heavily obfuscated, suggests a lure related to medical classification, likely to trick users into visiting the malicious URL. No scripts were extracted, but the presence of external URIs and the overall detection suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://maypoin.ru/award?keyword=clasificacion+de+cardiomegalia+pdf
    • http://zekoselu.22web.org/32_bit_chrome_browser_for_ubuntu.pdf
    • http://community-day.ru/24676532313xpvg4.pdf
    • https://cdn-cms.f-static.net/uploads/4491936/normal_6009f7d530a2e.pdf
    • http://ledimpress.biz/lomijatafodhnd8.pdf
    • http://trokot-shopnew.online/what_happens_when_you_focus_on_one_thingz5x8i.pdf
    • http://my-favshopd.online/3357357675234d2b.pdf
    • https://cdn-cms.f-static.net/uploads/4491450/normal_60567303cf5fa.pdf
    • http://jakartapro.xyz/the_heirs_kdrama_actorsj8894.pdf
    • http://lesegot.iblogger.org/dovuboloxokegufepu.pdf
    • https://static.s123-cdn-static.com/uploads/4372399/normal_5fe199938eee9.pdf
    • http://usechambre.xyz/elementary_linear_algebra_howard_anton_sladerryp4k.pdf
    • https://cdn-cms.f-static.net/uploads/4409628/normal_604a93e783aa0.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/jebokizez/char_broil_red_grill_reviews.pdf
    • https://2e6726a7-2e78-456a-9fa1-8bc85c3b20a6.filesusr.com/ugd/76e31d_3777ffcc675d470cbb6516e5fa4802a0.pdf?index=true
    • https://s3.amazonaws.com/wotodedaruzuk/carvajal_injury_report.pdf
    • https://562c2315-396f-49d1-9e45-1236e049cb13.filesusr.com/ugd/ec0012_5d79635c623046019ea48fb6a69804d0.pdf?index=true
    • https://s3.amazonaws.com/nedijowewoded/grange_primary_school_harrow_ofsted_report.pdf
    • https://s3.amazonaws.com/kavalukato/free_music_on_iphone_6s.pdf
    • https://8eccd3b7-fb20-4588-a5b5-4d8c58591879.filesusr.com/ugd/0e6328_23791c8bc86d4f2fa85baeaa85edb1e4.pdf?index=true
    • 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_off0000f8ce.bin
5215fee44f3e2baefe305cc596bdc4c99e4908ecaf3372f39b33072edc359b6c
pdf-font-stream PDF embedded font (sfnt) at offset 0xF8CE 5380 bytes
font_01_sfnt_off00010b01.bin
67972d87fc9026ca3c960eee6056c5bdfdad4f23663f440c899d55fefe169c10
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B01 12340 bytes