Malicious PDF — malware analysis report

Static analysis result for SHA-256 aaa7127bda1d2ae4…

MALICIOUS

PDF

79.1 KB Created: 2021-05-06 04:57:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 3251d0505a5b6b2af8052acba31d03b6 SHA-1: b0efb8407db2f4bf2c43829dfee753c2b93b348b SHA-256: aaa7127bda1d2ae4eaa6cf09fa931c0bee214d97ed13c9b14f95738532d538aa
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://jacksth.ru/strik?utm_term=whistler+radar+detector+z-11r%252B+review PDF link annotation
    • https://nijasofefovo.weebly.com/uploads/1/3/4/7/134719995/bisoregapiw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443802/normal_5fe0f1d479d08.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401558/normal_6057b41db38f4.pdfIn PDF document text
    • https://nobuzuza.weebly.com/uploads/1/3/4/7/134757083/lekowuw.pdfIn PDF document text
    • https://xonarupitowij.weebly.com/uploads/1/3/4/6/134617661/lusupif.pdfIn PDF document text
    • https://xaduregenotilok.weebly.com/uploads/1/3/4/7/134711203/nopezogepobukol.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463812/normal_6057e8b70e74c.pdfIn PDF document text
    • https://fijoxivivuf.weebly.com/uploads/1/3/4/0/134041864/pilopafav.pdfIn PDF document text
    • https://tawedituja.weebly.com/uploads/1/3/4/8/134864040/wukevof.pdfIn PDF document text
    • https://dofidosuxemaxej.weebly.com/uploads/1/3/4/5/134595751/65a80c9.pdfIn PDF document text
    • https://reropazorulofo.weebly.com/uploads/1/3/4/4/134437501/viwokuxotazutoseduku.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447630/normal_5fcc4504ba1ed.pdfIn PDF document text
    • https://javabudonoban.weebly.com/uploads/1/3/2/6/132683403/gatetuvefenalawuz.pdfIn PDF document text
    • https://kaxemesotom.weebly.com/uploads/1/3/4/7/134732336/6942869.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500889/normal_5fc8973daa440.pdfIn PDF document text
    • http://jovumelikas.22web.org/panudurutewiribu.pdfIn PDF document text
    • https://katalajoguv.weebly.com/uploads/1/3/2/7/132740778/7604560.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451757/normal_603620a588469.pdfIn PDF document text
    • https://nunajamedagafep.weebly.com/uploads/1/3/5/3/135325778/bipopen.pdfIn PDF document text
    • http://girameluxo.iblogger.org/blackberry_link._exe_free.pdfIn PDF document text
    • https://vubomuvasof.weebly.com/uploads/1/3/1/6/131606511/5e7efdb1a358.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://teruwisap.epizy.com/40704188928.pdfIn PDF document text
    • http://saniwetilufi.epizy.com/50617966670.pdfIn PDF document text
    • http://gixisenusadat.rf.gd/28040744069.pdfIn PDF document text
    • https://www.amazon.com/product-reviews/B07TWQGKSC?reviewerType=all_reviewsIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC65 2912 bytes
SHA-256: 1baa3efd180cf5f44d613abe34ea0380c2d25dd221f4ef864ac418d56f73cc35
font_01_sfnt_off0000f6c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C1 5328 bytes
SHA-256: bd22ccd3bfb896c3904ff0284838a721c547193977b88bc34f60727fe5797127
font_02_sfnt_off00010902.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10902 10872 bytes
SHA-256: 1f71ac963cf2d8dee53979075458154ff5ab72102f5437d58ac05d85c162d031