Malicious PDF — malware analysis report

Static analysis result for SHA-256 3159603f5ad2cd07…

MALICIOUS

PDF

77.6 KB Created: 2021-03-16 03:18:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 71ac503f0e2209ef48b76aab396452c7 SHA-1: 54cb9d04cf99eee43fbbfb2e0dd146d11e9b7a4d SHA-256: 3159603f5ad2cd07d9e829f4cb15a6c0d51977854e2d8e156a84c0cd936536cc
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm designed to manipulate search engine results. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these linked sites. No scripts were extracted, but the PDF structure itself is used to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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/wix?keyword=history+of+the+atom+review+worksheet+answers PDF link annotation
    • http://sikazigazes.mypressonline.com/aspartate_transaminase.pdfIn PDF document text
    • http://idealslimitalia-official.site/67825424244o8vha.pdfIn PDF document text
    • http://penageli.getenjoyment.net/84999918609.pdfIn PDF document text
    • https://vodefuba.weebly.com/uploads/1/3/4/6/134688083/gexofotilan-domiwatep-juvatuwuletozog-wariver.pdfIn PDF document text
    • http://xunarepozufuz.mygamesonline.org/pexepefi.pdfIn PDF document text
    • https://jevalibiku.weebly.com/uploads/1/3/4/2/134266190/1409128.pdfIn PDF document text
    • http://keysecret.ru/1207884750478eeg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465564/normal_601d2fc1827d1.pdfIn PDF document text
    • http://smcjd.com/cables_and_connectors_and_their_functionsijfwa.pdfIn PDF document text
    • http://deflecfcvy.best/tupuzexulavofaxop8rx4.pdfIn PDF document text
    • http://amsidgi.xyz/fezadubuk87i.pdfIn PDF document text
    • http://rogijowop.sportsontheweb.net/xefixerex.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454665/normal_602753fa0b362.pdfIn PDF document text
    • https://vavaxomutiposev.weebly.com/uploads/1/3/0/7/130738712/wozife-xiwegiwip-xitavufaweba-xisugupavobik.pdfIn PDF document text
    • https://jukaninigureze.weebly.com/uploads/1/3/0/7/130738482/zosurikukolu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kubowulurarekij.myartsonline.com/electrical_instrumentation_books_free_download.pdfIn PDF document text
    • https://6ddb26ad-aa8e-4a3e-a925-5cef6fc035e1.filesusr.com/ugd/d3d820_e54297694dc343b49cbfddd99f1bce3d.pdf?index=trueIn PDF document text
    • https://e966359d-176b-477a-9ad9-c314bea94227.filesusr.com/ugd/fa6f14_62e395527f4b42e5ad69d37d15c52a4f.pdf?index=trueIn PDF document text
    • http://ronojegev.rf.gd/watermark_document_free.pdfIn PDF document text
    • http://zemoxatovasoga.rf.gd/fotamipawesojirebovor.pdfIn PDF document text
    • https://6196a4e6-b3b5-4a85-a139-4ec84e0a53d9.filesusr.com/ugd/d01287_febabec4f1d74684b4e175d466096c48.pdf?index=trueIn PDF document text
    • https://a8a2d6b8-6248-42a0-90a4-e25e421c2e59.filesusr.com/ugd/f63f29_767ff13e50b545c6bcedb73ec1f93d26.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_off0000f192.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF192 5256 bytes
SHA-256: 8a628fdcdd58d67cf907cee40569b64283aade878e812c23a7c52d52d4d80b5c
font_01_sfnt_off00010358.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10358 11164 bytes
SHA-256: 42e1d9f93a8eaa4706e32bdb4021280fd800cce3735c7cc5aaf478e2c410db2c