Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4728203471d401a…

MALICIOUS

PDF

81.6 KB Created: 2021-04-30 03:57:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: a8c75d10e691f591569a098c0c4a8d38 SHA-1: 7a1f8b42d870e6168118365b98e7aaa17b2c1a5e SHA-256: c4728203471d401a37dd5d4901f44f183d5bafc6a17f71f60a122dcb9265f74e
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. The document body, though heavily obfuscated, contains a lure related to 'quarantine games' and points to an external URL. The presence of numerous embedded URLs, many on disposable hosting, further supports a malicious intent, likely to redirect users to a compromised site or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://zajinet.ru/strik?utm_term=best+quarantine+games+to+play+with+friends+online PDF link annotation
    • https://cdn.sqhk.co/rukugewul/Ihejhge/draw_defence_download.pdfIn PDF document text
    • https://cdn.sqhk.co/mugegiduveb/iggghc0/powerbass_10_4000w_dvc_subwoofer.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426279/normal_5ff5a1ef27c19.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447267/normal_602b9c0244b5d.pdfIn PDF document text
    • https://cdn.sqhk.co/nodomepe/fihijib/vefasipajalefil.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456705/normal_5fc868565c9e3.pdfIn PDF document text
    • http://wopivobozas.66ghz.com/anjana_2005_all_song.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369927/normal_5fe824ecd1021.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366036/normal_6033a8f401b57.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://0ecef3a8-5193-4df1-8dcb-1b7dd0f2be2a.filesusr.com/ugd/e6092c_8c36ff1cb4b94c639d33f2a15bd2fb64.pdf?index=trueIn PDF document text
    • http://ronodinagidos.rf.gd/lorafufuv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/080391fd-5c37-4af3-9922-79d07ad837aa/firefox_43.0.1_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28df88b0-ff46-4442-801b-64dd714ddaba/xopidinokobitorugagub.pdfIn PDF document text
    • https://0c62a338-6052-4cfc-b461-159bd736779f.filesusr.com/ugd/c4dbd3_25bcdc2d3026456787e02f0465f3a8a2.pdf?index=trueIn PDF document text
    • https://e61e9f85-32c5-4861-9fd4-b89109084c35.filesusr.com/ugd/2e4eb4_8c112dbe2a2f47bba61fd66eb97f8e95.pdf?index=trueIn PDF document text
    • https://b54663a3-ff9d-4122-b75c-69b71428c9b0.filesusr.com/ugd/cfa91a_fd221303e6ff4324a7820e50707c9266.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7f5e14f-07ed-4bbf-a35d-5f4ffcf02c99/nitebefuduwezinufelapame.pdfIn PDF document text
    • http://ziboporo.epizy.com/sipuwurujeb.pdfIn PDF document text
    • https://ffb80149-315c-4936-8637-e87477b606fc.filesusr.com/ugd/e7410d_263baf1e166d49349463869a37948a35.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f17c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF17C 5708 bytes
SHA-256: f4d070c16f3096a42d90627a5b9a0470d900f7449e8f2f6a4a71222114927221
font_01_sfnt_off000104be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104BE 10720 bytes
SHA-256: 2f8976400efdec6476849acc640f8a640182cf7e662e693c78149a074b44755c
font_02_sfnt_off000128e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128E5 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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