Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9ffcd9f66e6c78f…

MALICIOUS

PDF

133.0 KB Created: 2021-03-12 06:42:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 034d9db060967bc2bda04a75e00eaf03 SHA-1: 775f9f432eca426ef10dacae37a23655c2532302 SHA-256: a9ffcd9f66e6c78f53bc3e3f70f458f0d635a730e19d15a4f2bff72ec0976edf
164 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a significant number pointing to potentially malicious domains, as indicated by the 'PDF_SEO_LINK_FARM' heuristic. The 'ML_NYX_PDF_MALICIOUS' and 'CLAMAV_DETECTION' heuristics confirm its malicious nature, classifying it as phishing or a trojan. The embedded links suggest an attempt to redirect users to external sites for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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=android+app+review+blog
    • https://ganubidorebe.weebly.com/uploads/1/3/2/7/132740923/cddffa4.pdf
    • https://cdn.sqhk.co/sezepemanu/36ifPib/best_online_soccer_store_usa.pdf
    • http://tulakijumipad.22web.org/cpnreit_annual_report.pdf
    • https://cdn.sqhk.co/jesotipo/ohejigd/empires_and_allies_para_pc.pdf
    • https://cdn.sqhk.co/fadejiweruw/RibZqhj/battleship_online_games_free.pdf
    • https://divowotekek.weebly.com/uploads/1/3/4/7/134759223/zejuzoduvetene_xupabulenujel.pdf
    • https://bitoxogosem.weebly.com/uploads/1/3/4/3/134386372/875f99452b82.pdf
    • https://xomarexisu.weebly.com/uploads/1/3/4/7/134701616/ligukin.pdf
    • https://cdn.sqhk.co/wadelovelo/dmlgjje/kegax.pdf
    • https://fokikemapusa.weebly.com/uploads/1/3/1/3/131398543/wenulo-xutilixufowe-jusevi.pdf
    • https://cdn.sqhk.co/gutinisiv/0Fjbhio/81631181458.pdf
    • http://fanexaxujuto.22web.org/common_core_standards_math_pre_kindergarten.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/d53f4973-dd77-4b0c-85dd-25c697bce6a9/does_planet_fitness_charge_you_to_cancel.pdf
    • https://s3.amazonaws.com/lizuseguwix/encyclopedia_of_big_data_technologies.pdf
    • https://s3.amazonaws.com/vikukinumet/hppsc_answer_key_allied_services_2019.pdf
    • https://uploads.strikinglycdn.com/files/d58f7c4f-2d31-47d7-9efc-36475a6ebe5c/stephen_king_it_full_movie_2017_in_hindi.pdf
    • http://xatosizukav.epizy.com/ejercicio_aerobio_y_anaerobio.pdf
    • https://s3.amazonaws.com/bolovopizonuki/how_to_connect_polk_audio_psw10_10-inch_powered_subwoofer.pdf
    • https://uploads.strikinglycdn.com/files/31d3ef6b-0dfd-4e41-8c05-c45e3c32ede0/remefenowowigib.pdf
    • https://s3.amazonaws.com/tigewibejageju/42938810460.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_off0001ce00.bin
383cde35f126597e2bcc632f61f8b801a936241df687d57762f214c4da87b573		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1CE00 5228 bytes
font_01_sfnt_off0001dfe8.bin
275d8fad00fd222ee6ca9b05d64b91d12467c201d4eb3f514560ff6e978c6d9c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1DFE8 11504 bytes

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