Malicious PDF — malware analysis report

Static analysis result for SHA-256 4da4f6540e75cd22…

MALICIOUS

PDF

80.6 KB Created: 2021-05-25 03:27:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 304857c5df4686a3d2a4ad943b2eadcc SHA-1: c83326742794f95ed4134a37a856e26fa511b5e5 SHA-256: 4da4f6540e75cd225fe42bf0f092186a5d3ead4f43ec812a4f576eb271a208f6
186 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The primary URL points to 'zajinet.ru/strik' with a 'utm_term' parameter, indicating a potential phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://zajinet.ru/strik?utm_term=what+happened+at+the+end+of+maze+runner+3 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4391340/normal_5fc5f44c6c37c.pdfIn PDF document text
    • https://sudodufutela.weebly.com/uploads/1/3/5/9/135960501/linulu_dutip_nugepijoxaxag_wigamosuz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373505/normal_5fd1821e09414.pdfIn PDF document text
    • https://forelidik.weebly.com/uploads/1/3/0/7/130775511/674cc52d58e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422392/normal_6023923e07f11.pdfIn PDF document text
    • https://jipaxebuperiw.weebly.com/uploads/1/3/4/7/134751602/wazubawune_jomaperizarut_bovipofaz.pdfIn PDF document text
    • https://tujowijide.weebly.com/uploads/1/3/0/9/130969571/merupizoti.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485443/normal_5fdfd789962c7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414339/normal_6011a94953e50.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413701/normal_5fe70bb2df572.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373516/normal_604181dc3b212.pdfIn PDF document text
    • https://leditolovon.weebly.com/uploads/1/3/2/6/132682688/nikugoxemofup-tupetolifezumej-navevugujijapuj-vuwomexog.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495860/normal_6018029208908.pdfIn PDF document text
    • https://gixixujenusig.weebly.com/uploads/1/3/4/6/134663953/jatazu.pdfIn PDF document text
    • https://mofugitapab.weebly.com/uploads/1/3/4/7/134728490/7312858.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387033/normal_5fccff68765dc.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/kubedukowug/bitcoin_mining_app_free.pdfIn PDF document text
    • https://s3.amazonaws.com/mamibis/chocolate_muffin_nutrition_information.pdfIn PDF document text
    • https://s3.amazonaws.com/jotogorurekuro/pre_k_reading_workbook.pdfIn PDF document text
    • https://s3.amazonaws.com/falufusu/brawl_stars_apk_hile_indir_cretsiz.pdfIn PDF document text
    • https://s3.amazonaws.com/didowugorokirug/just_dance_animals_song.pdfIn PDF document text
    • https://s3.amazonaws.com/wozowuledij/idsa_pneumonia_guidelines_2017.pdfIn PDF document text
    • https://s3.amazonaws.com/migivewuwe/best_linkedin_inmail_templates_for_sales.pdfIn PDF document text
    • https://s3.amazonaws.com/xepululejiwof/garmin_astro_320_with_2_dc40_collars.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_off0000fe50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE50 5296 bytes
SHA-256: 9d12edc641f4de61c179f3aa8bfe0bd333e87366ec7c6fd62121525bba25400a
font_01_sfnt_off0001104b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1104B 10820 bytes
SHA-256: 3d25d452742df8d3c0a6f92ad70ef41b40ce2ae82c6c90c591138d9841670e5b