Malicious PDF — malware analysis report

Static analysis result for SHA-256 785e8a357f3e7fc6…

MALICIOUS

PDF

87.8 KB Created: 2021-03-08 03:52:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 8ad60e1b158e802a126384547255c0e3 SHA-1: 92e6d0e3921ff451897f26ed283a6d1436c3bf9b SHA-256: 785e8a357f3e7fc687d0b2d5ef15147265ca82f530b52abd2a240aabeb330195
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://pelibifir.ru/strik?utm_term=dark+souls+bosses+ranked+easiest+to+hardest PDF link annotation
    • http://yblda.fun/gizukamilitewarosemutav2xw98.pdfIn PDF document text
    • http://auth02mobility.com/contabilidad_de_costos_para_que_nos_sirve5vebe.pdfIn PDF document text
    • http://goodsun.space/siwosubobipizuviwjk8he.pdfIn PDF document text
    • http://www19216801.site/bbc_learning_english_lingohacksc9a6.pdfIn PDF document text
    • http://pokemonrivals.online/convertir_pulgadas_cuadradas_a_metros_cuadrados8mfwp.pdfIn PDF document text
    • http://gokuluzed.iblogger.org/fuxukigot.pdfIn PDF document text
    • http://tedamowajowiw.22web.org/final_fantasy_xiv_a_realm_reborn_gameplay_ps4.pdfIn PDF document text
    • https://buvonidodiwa.weebly.com/uploads/1/3/4/3/134332647/4469946.pdfIn PDF document text
    • https://kuvijoxujav.weebly.com/uploads/1/3/4/2/134266993/filegepik.pdfIn PDF document text
    • http://josebixotarez.22web.org/lenabisewusijixifosuva.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://begupegag.epizy.com/22781887016.pdfIn PDF document text
    • https://s3.amazonaws.com/lewuli/anticoagulante_farmacologia.pdfIn PDF document text
    • https://s3.amazonaws.com/xulikamul/63719941149.pdfIn PDF document text
    • https://s3.amazonaws.com/jawusawar/vulanabemiretu.pdfIn PDF document text
    • https://s3.amazonaws.com/jevelel/averages_worksheet_ks3_tes.pdfIn PDF document text
    • http://kalijumixu.epizy.com/intel_nuc6cayh_datasheet.pdfIn PDF document text
    • https://s3.amazonaws.com/gifiz/negative_core_beliefs_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/babetafaperaxov/drug_today_book_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/suzixegazunow/another_me_2014_full_movie.pdfIn PDF document text
    • http://mesuwirafifi.rf.gd/trinus_cardboard_vr_free.pdfIn PDF document text
    • https://s3.amazonaws.com/pegozegi/vexanewofobaxikinuv.pdfIn 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_off00011b92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B92 5116 bytes
SHA-256: dcbee2b035416bee6d2c30dcafedc2f53cc879c122c712a3ed6ab2861cc3dc44
font_01_sfnt_off00012cf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CF0 10840 bytes
SHA-256: f476094c972eed01b622a6f631e0797aa5ab9a2ae954ae9a1b4954b01a8ac653

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