Malicious PDF — malware analysis report

Static analysis result for SHA-256 858afca978cf20a0…

MALICIOUS

PDF

77.6 KB Created: 2021-02-16 00:32:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 0992ee3f6896a78d6ff8980a8e51f6e9 SHA-1: 0fc8ebb90133860133ea52683159a4f20c2fcf4e SHA-256: 858afca978cf20a08e5ad64af3ae4a1cd248f86f4ff7231912dfd56968d09dfb
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, a common tactic for link farms used to distribute malware or conduct phishing. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URIs suggest it's designed to redirect users to malicious sites, likely as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://leonvi.ru/strik?utm_term=4th+grade+fluency+passages+with+comprehension+questions PDF link annotation
    • http://prolac.ru/86264619907l40m9.pdfIn PDF document text
    • https://velumosatowe.weebly.com/uploads/1/3/4/8/134883763/wajoboluxixeje.pdfIn PDF document text
    • http://tomandbxof.site/la_guerra_no_tiene_rostro_de_mujer_librow39tr.pdfIn PDF document text
    • https://namikefazexu.weebly.com/uploads/1/3/1/6/131606603/bosaziwig-bugozat-mabepatizafopi.pdfIn PDF document text
    • https://givodevivunafa.weebly.com/uploads/1/3/1/8/131871579/rodureva-zebedivesen.pdfIn PDF document text
    • http://wuvuzijime.22web.org/whatsapp_business_apk_mod.pdfIn PDF document text
    • http://reduslim-sitoufficiale.site/xalekewurokasaxupexeludumr575y.pdfIn PDF document text
    • https://bewevirat.weebly.com/uploads/1/3/1/4/131437926/4c7df697af7f80.pdfIn PDF document text
    • https://ziduwoparexor.weebly.com/uploads/1/3/2/8/132815175/7379473.pdfIn PDF document text
    • https://sisareses.weebly.com/uploads/1/3/1/4/131454440/xipiwofir.pdfIn PDF document text
    • http://static-get.top/community_centre_evening_classes_ielts_listening_answerss944m.pdfIn PDF document text
    • http://choosemadam.site/x-_rite_colorchecker_passport_2bumky.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://ziwezamo.epizy.com/ngk_cut_songs_masstamilan.pdfIn PDF document text
    • https://s3.amazonaws.com/zaxuledo/boat_bill_of_sale_form_bc.pdfIn PDF document text
    • http://roparewuna.rf.gd/memorandum_report_business.pdfIn PDF document text
    • https://s3.amazonaws.com/meludav/bootstrap_software_free_for_windows_10.pdfIn PDF document text
    • https://s3.amazonaws.com/sasufufa/bridge_to_ielts_answer_key.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C7 5764 bytes
SHA-256: 6f025ce22735d4693d2f783e687c1a56ad3a28e2193c174e4acfb63decf0e8ea
font_01_sfnt_off0000f84d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF84D 10112 bytes
SHA-256: 254525306fa2cbad0c81e793ef3cda95b1c000c1a89abb03c64bcc0081d89090
font_02_sfnt_off00011afd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AFD 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

Open this report in the interactive analyzer, or submit your own file for analysis.