Malicious PDF — malware analysis report

Static analysis result for SHA-256 b538d89b4b4b7e87…

MALICIOUS

PDF

74.1 KB Created: 2021-03-28 07:10:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: c8a44da77b4cf06e94de8da0d04c1fa3 SHA-1: d3ac02c2c45e6aa2ae5dccc091c381e7f2d62e3f SHA-256: b538d89b4b4b7e8774d7c1d4289ddb07d44372bf9b8113e518c3f37278f5df18
126 Risk Score

Malware Insights

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

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 0.9993

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://dafemum.ru/123?utm_term=deliciously+ella+podcast PDF link annotation
    • https://subamepowesita.weebly.com/uploads/1/3/4/8/134875458/dozabexenosu_tozewug_kimaxuliluto_lanumiroz.pdfIn PDF document text
    • http://rat-red.space/28839153064snvhg.pdfIn PDF document text
    • https://fasexunatosupa.weebly.com/uploads/1/3/1/6/131606354/1486ed5.pdfIn PDF document text
    • http://idealica-it.website/potato_osmolarity_lab_report_ibaxfjr.pdfIn PDF document text
    • http://jonotijero.medianewsonline.com/18592199796.pdfIn PDF document text
    • https://luxituwane.weebly.com/uploads/1/3/1/8/131859527/c77de70af.pdfIn PDF document text
    • http://vclean-sale.shop/tugezud4g76f.pdfIn PDF document text
    • https://jodulimije.weebly.com/uploads/1/3/4/7/134732884/6aa91d3e.pdfIn PDF document text
    • https://nutajutibasetak.weebly.com/uploads/1/3/4/6/134638930/lemibujig.pdfIn PDF document text
    • http://b2b-servis.ru/what_is_the_healthiest_salad_at_chick_fil_andwwy.pdfIn PDF document text
    • http://dobilarujokux.sportsontheweb.net/cuaderno_de_ejercicios_de_los_cuatro_acuerdos_toltecas.pdfIn PDF document text
    • http://rewita.fun/hoover_carpet_cleaner_model_fh50150_manualsmai7.pdfIn PDF document text
    • https://wunobenera.weebly.com/uploads/1/3/4/8/134887230/1537027.pdfIn PDF document text
    • https://vimosetadasosus.weebly.com/uploads/1/3/2/7/132740377/3c91d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://puliwoxijulu.rf.gd/english_basic_grammar_test.pdfIn PDF document text
    • http://rolaxaja.rf.gd/mofapad.pdfIn PDF document text
    • http://xiriwut.epizy.com/77485835135.pdfIn PDF document text
    • http://judiserod.onlinewebshop.net/jupadukufesoxadisodari.pdfIn PDF document text
    • http://tuvatopuvonu.epizy.com/h_pylori_treatment_guidelines_2018_ppt.pdfIn PDF document text
    • http://kuvofefifowojop.epizy.com/45964518661.pdfIn PDF document text
    • http://mosuzuxogobet.epizy.com/narasimha_karumanchi_data_structures_in_java_free_download.pdfIn PDF document text
    • http://jovifididapop.epizy.com/2006_cadillac_sts-_v_performance_parts.pdfIn PDF document text
    • http://zizidamikedug.epizy.com/pdf_drucken_aus_edge_funktioniert_nicht.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_off0000e564.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE564 5072 bytes
SHA-256: 2cca692327841415b5ff8d755c059f2356d5db86a56734388cdb8e73e7b00625
font_01_sfnt_off0000f6ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6CA 10616 bytes
SHA-256: 7b3bb8c5a971a1f27704a772d617bf2feef56ce842ff297371385d3b4f63356f

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