Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4227d9fae29e0eb…

MALICIOUS

PDF

86.6 KB Created: 2021-04-13 14:58:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 4c02bfeec320ca4094eb2a5933ad65c9 SHA-1: ba6781a03637a659768180e3fe278c6fcc0007ce SHA-256: d4227d9fae29e0ebe6eb85921febcb7b7fff5f0f5693772ebbcfdf6942a9bd0a
186 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded external links, many pointing to disposable hosting services, suggesting a link farm or phishing campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO spam. No scripts were extracted, but the embedded URLs are the primary indicators of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://baarspo.ru/strik?utm_term=cry+the+beloved+country+full+movie+free+online PDF link annotation
    • https://reserekeluzor.weebly.com/uploads/1/3/4/7/134721257/16ead.pdfIn PDF document text
    • https://nuxogisufebodad.weebly.com/uploads/1/3/5/9/135965827/9331919.pdfIn PDF document text
    • https://legunumazonum.weebly.com/uploads/1/3/4/4/134455594/7884550.pdfIn PDF document text
    • http://torixobo.mypressonline.com/past_simple_and_past_continuous_tense.pdfIn PDF document text
    • https://sawuwirepugasup.weebly.com/uploads/1/3/0/9/130969548/favemujaveji.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393632/normal_60153a22df86c.pdfIn PDF document text
    • http://malolufixanovas.sportsontheweb.net/93037234999.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375531/normal_603756bcaf006.pdfIn PDF document text
    • https://rewuxumo.weebly.com/uploads/1/3/4/5/134586949/126210.pdfIn PDF document text
    • https://xidamosu.weebly.com/uploads/1/3/4/7/134707329/fugevanukules.pdfIn PDF document text
    • https://vejevidumuruje.weebly.com/uploads/1/3/5/3/135302175/zilawowu.pdfIn PDF document text
    • https://ludunijup.weebly.com/uploads/1/3/0/9/130968942/db5e877cb.pdfIn PDF document text
    • https://zozufawagizawag.weebly.com/uploads/1/3/4/4/134454621/sojukenasipok.pdfIn PDF document text
    • https://xowogibudul.weebly.com/uploads/1/3/4/4/134446034/jinivo-jofidonimuf-fobeb-luluzavorabom.pdfIn PDF document text
    • https://mojijunu.weebly.com/uploads/1/3/1/0/131070220/xowenifapalevez.pdfIn PDF document text
    • https://wirazalalotun.weebly.com/uploads/1/3/0/7/130776536/jasemusus-kokilerubowoka-kodewebovasefel-mivigi.pdfIn PDF document text
    • http://bamefidev.mygamesonline.org/mri_brain_atlas_and_text.pdfIn PDF document text
    • http://mumijivamivaxij.medianewsonline.com/50_tons_de_liberdade_livro_completo.pdfIn PDF document text
    • https://kunugamonigosa.weebly.com/uploads/1/3/1/8/131871761/bulotewixe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://4c72699b-aa2e-4dc8-8bd5-1a54e8f938a6.filesusr.com/ugd/f3cb45_276046f4f64d4386916b6cefb10d6337.pdf?index=trueIn PDF document text
    • http://zuxokoberibaw.atwebpages.com/adelaide_city_map.pdfIn PDF document text
    • https://7e079b21-6cfc-4bbc-a8af-001f4930a7f2.filesusr.com/ugd/f66805_260e13a868974a7dbeb3fba88cd73a32.pdf?index=trueIn PDF document text
    • https://b9264059-5ce6-458a-812b-58b21e0c51d1.filesusr.com/ugd/9a3dc1_e825166576244276ad8e022751af0e65.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_off00011557.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11557 5080 bytes
SHA-256: 8300968b0fe5dec7be38b048e6167a48aa2bde984c82cb4ccd8fd3de2734b888
font_01_sfnt_off00012684.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12684 11372 bytes
SHA-256: 779599f41efe819989e39fa538066a318078d8588a682f1a7810ee466bbab457