Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c318ada76be1de9…

MALICIOUS

PDF

74.6 KB Created: 2021-06-07 17:59:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: d0379d36722dcf8052af63170417ed24 SHA-1: 51c68d0519040412db66866bdd3891ac898c3209 SHA-256: 2c318ada76be1de903dc55e2db8821b198dd049409e04c85fe0dbb88d3e935e6
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, identified as a link farm, with a deceptive lure related to English worksheets. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URLs suggest the document is designed to redirect users to potentially malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://nomylo.ru/pbw?utm_term=tenses+in+english+worksheets+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369922/normal_600eb48a8e83f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495843/normal_5ff5bdd9c22e4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379719/normal_5fe34e9752761.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417325/normal_605f5016047b0.pdfIn PDF document text
    • https://nevimemiwuje.weebly.com/uploads/1/3/5/3/135332714/tijilunaxavafep.pdfIn PDF document text
    • https://sujumakatu.weebly.com/uploads/1/3/1/3/131379709/jokazejaza.pdfIn PDF document text
    • https://nabumeludofava.weebly.com/uploads/1/3/4/3/134373896/619207.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481839/normal_602881a365372.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404500/normal_6053189dae4b0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413701/normal_5fe70ca701998.pdfIn PDF document text
    • https://belexikezetuvom.weebly.com/uploads/1/3/0/7/130775063/lubizosikape_pomamavuvo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483104/normal_60314d589145e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477401/normal_60bbdfb3b2cb4.pdfIn PDF document text
    • https://lojavexir.weebly.com/uploads/1/3/5/9/135963097/rexifisanu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464067/normal_60b88ae555a39.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a01973a-f099-4245-b1fc-b63b1519496a/18899359914.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a33cf9e-f61c-434d-a59f-18fa136b51d5/what_is_a_good_stock_trading_website_for_beginning_traders.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3301595-5a19-484d-bef6-305768582d07/muxiravezajugamaw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/955121d7-c1f8-4185-a72a-fba9df2357cc/31393521026.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5cc6c451-f3e1-4171-825d-6c8dcdff12ad/la_odisea_resumen_corto_brainly.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1cca82e9-18ce-4870-8dc8-3d9d6bf01ea2/highway_capacity_manual_software_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8cce656c-c388-4615-bd8b-6e10b3afd4a2/dudewitigadezakunivo.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_off0000e640.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE640 5200 bytes
SHA-256: 86e2586775cb2c733f6b377a6f754e783f1544708906f1fb62ee5fc44f5aedd1
font_01_sfnt_off0000f7ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7FF 10816 bytes
SHA-256: 460290df31ace2f77b33463e7052d5dbe3559da8edcacdfa407344ed85c0dbd8