Malicious PDF — malware analysis report

Static analysis result for SHA-256 309bd364be8cb476…

MALICIOUS

PDF

69.8 KB Created: 2021-05-17 16:19:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: a40c39de58075c8771c40bba01fcff7a SHA-1: 58e31ee2664ad449db2e2e14b24c9a6b8ef7d824 SHA-256: 309bd364be8cb476913251c36a9cd44dfc3abe1b3a0864a078ae172430fae285
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 0.9997

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://dafemum.ru/strik?utm_term=gta+v+premium+edition+ps4+what+do+you+get PDF link annotation
    • http://vanimerukaguto.scienceontheweb.net/genetically_modified_food_project.pdfIn PDF document text
    • https://nosekixiruwem.weebly.com/uploads/1/3/1/3/131380944/fubevogod-pugareg-lulererevu-pifareni.pdfIn PDF document text
    • https://rubexanow.weebly.com/uploads/1/3/5/3/135346757/d323de.pdfIn PDF document text
    • http://xafesalizupapal.22web.org/mikekusarawani.pdfIn PDF document text
    • https://sexabadipeg.weebly.com/uploads/1/3/4/6/134684930/3187969.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411270/normal_60694a359f473.pdfIn PDF document text
    • https://kenazago.weebly.com/uploads/1/3/1/0/131070597/ee9bba14321137b.pdfIn PDF document text
    • https://devigejijakefu.weebly.com/uploads/1/3/2/7/132740662/fc9d1c8.pdfIn PDF document text
    • http://sugameloxufe.mywebcommunity.org/jagujedejigaja.pdfIn PDF document text
    • https://savozajit.weebly.com/uploads/1/3/5/3/135320594/6925895.pdfIn PDF document text
    • https://nidiladidubupa.weebly.com/uploads/1/3/4/7/134753920/5209947.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445531/normal_5ffe252ee701f.pdfIn PDF document text
    • https://jotinebemoti.weebly.com/uploads/1/3/4/6/134681432/kenoxepubufarepotij.pdfIn PDF document text
    • https://mukuriwubi.weebly.com/uploads/1/3/1/4/131483253/2737112.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vekibavekuje.epizy.com/business_plan_writing_format.pdfIn PDF document text
    • http://livixow.epizy.com/65714232505.pdfIn PDF document text
    • https://s3.amazonaws.com/zafibimutadoti/wotuzotivevibukadolol.pdfIn PDF document text
    • http://ziwutaje.epizy.com/wegexoveremadogilefoma.pdfIn PDF document text
    • https://s3.amazonaws.com/jefazaxal/resumen_del_libro_los_juegos_del_hambre_1_por_capitulos.pdfIn PDF document text
    • http://zevabexidedu.rf.gd/54261472999.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_off0000cd2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD2E 5716 bytes
SHA-256: 730f34145c953282980e2ca9e2b4c4021f5b27bcc160cf5430637d6612c7b9fc
font_01_sfnt_off0000e0a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A2 13192 bytes
SHA-256: 2c27680527ae6ede0e94bce249ed17f83de7a0ee10701efce8e55a9a62236317