Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9b204c9337ff8dc…

MALICIOUS

PDF

77.6 KB Created: 2021-03-30 09:44:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6554f0c6e4cde1540df6a5eb46c6051c SHA-1: 4b61fb5a06a2bbe46f730596eb3ee0a43006d0d5 SHA-256: b9b204c9337ff8dce39d8a7d243d3cc097d20e639c3901bcf14ac1e08704561e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics, including a critical detection for a link farm and a high ML score, indicating malicious intent. The file contains a large number of external links, suggesting it is designed to redirect users to potentially malicious websites. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its classification as a phishing or trojan delivery mechanism.

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://cdn.sqhk.co/nulaliki/nzigKod/vintage_kingpin_bowling_game.pdf
    • https://cdn.sqhk.co/xogovofofi/gcAgdib/save_our_earth_vans.pdf
    • https://cdn.sqhk.co/bofotabi/fhfxXha/vuzumozepowu.pdf
    • https://lizodeva.weebly.com/uploads/1/3/5/3/135342900/luxorulexez-pojinogazoxal.pdf
    • http://form-lnstagramverifiedbadges.com/kujenuvakelemozidizowedeqkdk.pdf
    • https://cdn.sqhk.co/pirujezexod/hjgcTFV/69669040461.pdf
    • https://cdn.sqhk.co/sajatanugeg/ieLVFg8/54327727409.pdf
    • https://faxipanonuk.weebly.com/uploads/1/3/4/3/134352952/7546754.pdf
    • https://cdn.sqhk.co/fubafonu/c9jiicW/nike_outlet_las_vegas_strip.pdf
    • https://cdn.sqhk.co/gabixeme/rChgcge/prince_sultan_armed_forces_hospital_madinah_email_address.pdf
    • https://bezujaseda.weebly.com/uploads/1/3/1/4/131437953/pefaruxiwuge_rarolojugake_jepuropujuti_tofija.pdf
    • http://ig-socialmedia.xyz/functional_programming_in_javartrty.pdf
    • http://esparks.ru/all_water_breathing_forms_demon_slayerttbzx.pdf
    • https://zitidatuviwe.weebly.com/uploads/1/3/4/4/134493200/kekepubarewo_wuxidil_wavubugu_vaxivadujepatuj.pdf
    • http://load-bcp.com/80114804598yluu5.pdf
    • https://cdn.sqhk.co/lidavibojuje/kn8MAFl/ditafa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://feedproxy.google.com/~r/wb/ENAH/~3/Ecv9gJ3Ok6E/wb?keyword=pearson%20us%20history%20textbook%20pdf%2010th%20grade
    • https://uploads.strikinglycdn.com/files/1523a846-f20b-4d7d-9645-9958e4c385f5/nigumowimigilovulagibukem.pdf
    • https://uploads.strikinglycdn.com/files/b3c4f073-8ac4-438c-805d-e15a3973401a/hp_model_11_y010wm_specs.pdf
    • https://uploads.strikinglycdn.com/files/77eab89d-5e61-499a-96fc-daf94f7202d3/4251506414.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_off0000f19f.bin
968d714db20d851e2c8ff78c20f8c1b34ca65f5d4b81817a8a3e2fd0afc3edf4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF19F 5840 bytes
font_01_sfnt_off0001058c.bin
181d2d23f9781e0b409d5abe02ab08cdf6048784d9e3512c96a1fd1f71d1785f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1058C 10336 bytes

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