Malicious PDF — malware analysis report

Static analysis result for SHA-256 95ed811220b472ad…

MALICIOUS

PDF

77.3 KB Created: 2021-04-06 17:41:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: ed630a24460a600790fdb597e6db890f SHA-1: 61818144c251e7b243eb2c30777af04d563556eb SHA-256: 95ed811220b472ad0dde601da3c09dddf1797ccc4e21bc5bdcb513283a671629
156 Risk Score

Malware Insights

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

The PDF document contains numerous external links, a technique often used for SEO poisoning or to redirect users to malicious sites. The primary malicious URL identified is https://maypoin.ru/award?keyword=binomial+expansion+questions+and+answers+pdf, which is likely intended to host phishing content or malware. The presence of PDF_SEO_LINK_FARM heuristic and ClamAV detection further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 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.
  • 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=binomial+expansion+questions+and+answers+pdf PDF link annotation
    • http://mevixonur.mywebcommunity.org/calendario_agricola_lunar_2020_ecuador.pdfIn PDF document text
    • http://sakivometo.medianewsonline.com/98041164598.pdfIn PDF document text
    • http://vipadobotisituz.mygamesonline.org/new_mercedes_a_class_brochure_2020.pdfIn PDF document text
    • http://mujabelor.mywebcommunity.org/resumen_acto_2_el_si_de_las_nias.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zukogi/arri_alexa_mini_user_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/vonutavekip/ambien_answer_to_roseanne.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05d48f9d-1d84-4e33-9b86-3c9922d8e75a/4761008184.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/740a7c72-60a2-4ee6-9ca8-7fb1c002d76b/why_does_my_brother_laser_printer_keep_going_offline.pdfIn PDF document text
    • https://s3.amazonaws.com/banula/gadudonuji.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d039df50-34ee-421e-a5c7-8283170c5fa1/positive_behavior_support_plan_for_adhd.pdfIn PDF document text
    • https://f187853a-68e6-4ed6-a420-9593b89d6738.filesusr.com/ugd/27c34a_0965b1d5beea488da15bece027640836.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/benuka/solving_quadratic_equations_by_graphing_activity.pdfIn PDF document text
    • https://45ae50e1-98a8-4501-9ad6-fc0df438eb43.filesusr.com/ugd/b16523_23ccad3195de4983877a4891ceaad56a.pdf?index=trueIn PDF document text
    • https://1a9cd40a-f0d6-44d4-a143-19288280ca2b.filesusr.com/ugd/7a13df_8a034fc688d64b26b5f3d047bf9780d3.pdf?index=trueIn PDF document text
    • http://besafetusupug.atwebpages.com/what_is_99_years_lease_india.pdfIn PDF document text
    • https://s3.amazonaws.com/rebesudanolo/hollywood_movies_in_tamil_dubbed_full.pdfIn PDF document text
    • https://s3.amazonaws.com/ladojenefe/92852425782.pdfIn PDF document text
    • https://6ba8113a-99dc-4618-97bf-d7180f10ff72.filesusr.com/ugd/b6edda_b551959b5f8940f391d98019115f2e60.pdf?index=trueIn PDF document text
    • https://ebba3e40-d49f-4cc8-b137-373bb1124918.filesusr.com/ugd/384ea4_3dcbf768ad234b35bcb78e5d3c0d1663.pdf?index=trueIn PDF document text
    • https://5a995288-ce6f-4ae3-a3e6-14272d8003db.filesusr.com/ugd/7be1cd_34f75ae1d53d4f33b21321d3f6b26441.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pazerogasarinu/how_gravity_influence_time.pdfIn PDF document text
    • https://9eff4bf0-55a5-42b9-a65a-250f23c32afd.filesusr.com/ugd/80978b_732b58476eb34227a8b97c8a105cef7b.pdf?index=trueIn PDF document text
    • https://a24bc4ef-4ee2-4fae-af0c-c9fea810b245.filesusr.com/ugd/67d96c_f359006d40504846a9fd1bfedd77a70e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/53fc104d-9d3a-4b9f-89a9-f66504594e07/zobikirepile.pdfIn PDF document text
    • https://438e95ed-c264-4db5-88d3-1a9ca8b91b86.filesusr.com/ugd/733c1f_fca51482ee6f40c88290d80595b74a6f.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE38 5520 bytes
SHA-256: cb7d5ed946f25ef139483121f2b8ebe5524257dc85d2db12fa04c53e6f8c4676
font_01_sfnt_off000100f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100F9 10920 bytes
SHA-256: 25a3f1d8349255062ceb671510a0e263e369be0c5a1fcbac3bec56f2ec24ce31