Malicious PDF — malware analysis report

Static analysis result for SHA-256 b393c3e9ff57276f…

MALICIOUS

PDF

96.4 KB Created: 2021-03-11 12:54:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 06b485794ea3f0f12415992a9382d97b SHA-1: b3900ee5c1bb61120f2df55b648ef3e125d8e215 SHA-256: b393c3e9ff57276f93ff4dcad7302feaf1df4b5a2d912a555dc2af32f78a6370
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, suggesting a malicious intent to redirect users. ClamAV also detected it as 'Pdf.Phishing.Trojan'. While no scripts were directly extracted, the presence of numerous external URLs indicates a phishing or malicious redirection attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://golowaki.ru/award?keyword=apollonius+of+tyana+pdf
    • https://cdn.sqhk.co/vuwipabobatu/gcxyhgl/indycar_race_on_tv_today.pdf
    • https://cdn.sqhk.co/gewowamizes/iaPjhjj/73559783201.pdf
    • https://cdn.sqhk.co/fudamozomeb/nMoifhi/zac_vs_zombies_full_version_download.pdf
    • https://cdn.sqhk.co/xamubana/iejjvjf/tasegavinafumoxal.pdf
    • https://cdn.sqhk.co/dosovejozeb/piiBidQ/best_bookmark_manager_tools.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/muvevanepen/4747739131.pdf
    • https://6b137298-3864-41c5-aaa3-11744000c3c2.filesusr.com/ugd/b916f4_149c4526140040e1ae916431d8f6c4c8.pdf?index=true
    • https://c6de0af5-2a4c-46da-924c-839bccb102c6.filesusr.com/ugd/5f1f0f_8d41199ddc164c82b7ba02668c690249.pdf?index=true
    • https://s3.amazonaws.com/xupimaral/bhagavad_gita_tamil_audio_book_free_download.pdf
    • https://a6132035-7465-4fe4-be4e-2faa96c22dab.filesusr.com/ugd/cf950b_c419ed4ef9d44d069cd9b972fab396c9.pdf?index=true
    • http://genezifovijewi.epizy.com/59090863038.pdf
    • http://sogikosuru.rf.gd/american_economic_history_8th_edition.pdf
    • https://5b3500e9-40b4-440a-9ada-171ed8bcf4c9.filesusr.com/ugd/7820d0_94aa188c832b474185abda949ba0ccec.pdf?index=true
    • https://s3.amazonaws.com/falejogajir/batiboromudadak.pdf
    • https://6440a9f6-5e82-4153-977b-4ffe9374ec4a.filesusr.com/ugd/7182f3_e73e0c4eb26145898192491dae3edd27.pdf?index=true
    • https://s3.amazonaws.com/jozaponi/chisel_sharpening_guide_uk.pdf
    • https://eb40363d-1d1f-4170-a897-f23f0f433116.filesusr.com/ugd/2a1429_6e81045c4ebe4f11b220ed2cf5ef0c67.pdf?index=true
    • https://s3.amazonaws.com/gidibesuxi/76609558684.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013b61.bin
bdd021460616ab0dfa420188cd2d4c6b65d73bfd3001cdf693c1993cc5206235		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13B61 5028 bytes
font_01_sfnt_off00014c9b.bin
0b38cca932c70b85ccc2665eb906abb7775669d61730065d3f0d064b8c2eca84		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14C9B 12124 bytes

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