Malicious PDF — malware analysis report

Static analysis result for SHA-256 b99d68bcf0fe1802…

MALICIOUS

PDF

101.4 KB Created: 2021-03-29 15:15:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: b976f4ba61f7b88a9895ccabb4f33390 SHA-1: de880469e1fdc871acc61c6b1ef371ee0c9a1f15 SHA-256: b99d68bcf0fe18028c4335a1a5f45b80a56a5b6ba2651454f0dc612fc245a68b
126 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with a primary suspicious URL pointing to 'leonvi.ru'. The document body, though heavily obfuscated, suggests a lure related to 'landscape architecture design principles pdf', likely to trick users into visiting the malicious domain. No scripts were extracted, but the presence of external URIs and the overall detection profile strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://leonvi.ru/award?keyword=landscape+architecture+design+principles+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4411219/normal_5ff9a42116400.pdfIn PDF document text
    • http://joriwolujuf.sportsontheweb.net/nurani_quran_with_bangla_translation.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457881/normal_60399ac732b66.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485927/normal_602a2ebbd19e6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369917/normal_602803e2be676.pdfIn PDF document text
    • http://padulima.22web.org/lurivebafow.pdfIn PDF document text
    • http://juwoniki.getenjoyment.net/qualified_audit_report.pdfIn PDF document text
    • http://doxosutida.22web.org/45561573386.pdfIn PDF document text
    • http://legezunoj.22web.org/nejevu.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/a96070a5-3775-42e4-b129-56acb95c95d6/76745071350.pdfIn PDF document text
    • http://sefobetibaboxi.epizy.com/navudozosabojudenu.pdfIn PDF document text
    • https://a82c121c-2200-4cd7-aff6-47cf910fdadb.filesusr.com/ugd/117c17_c32785ca0ea34a698b2c5d4037fd7756.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd7f3904-5e52-4fa7-8113-2ba08be7eb6d/nidagarisudufimelekaze.pdfIn PDF document text
    • http://vulebodifoguvar.epizy.com/93785400014.pdfIn PDF document text
    • https://3857ddc0-2b33-46ba-b4a8-ebef9b167687.filesusr.com/ugd/5cc0d5_e9ac1a3364244770b0f22fc89d91933c.pdf?index=trueIn PDF document text
    • https://6b9ff03a-ef48-417a-a14c-919df0f903d0.filesusr.com/ugd/f459ea_7ef65d8594f54c5d9fac4e5b0c9d750d.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_off000151a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151A0 5360 bytes
SHA-256: 2a2839299d45eeb3f7e7f032310b0837dc8fac7d58d59004e16d4091682d4fbb
font_01_sfnt_off000163dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x163DC 10644 bytes
SHA-256: 3c9aaf1ac08e4230d336a8da58926d443b9e6261a27fe1bd62cbbc6d0488f2be

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