Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f5c65f191a89d76…

MALICIOUS

PDF

79.6 KB Created: 2021-05-01 01:47:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 735b4f1915d023892e4b39956554bfff SHA-1: b5c146380a4a295022bcd81e3e02a0773871d19e SHA-256: 9f5c65f191a89d7682b2c97f7c6d3df3245b6e98e822894e3ba5940d13e6130b
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many pointing to disposable domains, suggesting a link farm or phishing lure. The primary URL, 'https://jottigo.ru/strik?utm_term=is+barrons+good+for+sat', indicates a potential phishing attempt disguised as a search result. The ML classifier and ClamAV detection strongly support its malicious nature, likely as a phishing or scam document.

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://jottigo.ru/strik?utm_term=is+barrons+good+for+sat PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4480590/normal_5ff47602492df.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411483/normal_5fd093276c69b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383692/normal_60065e885fa30.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420459/normal_5fd31f4dd935f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385435/normal_601fbd5ff1289.pdfIn PDF document text
    • https://guvefivilemu.weebly.com/uploads/1/3/4/3/134397682/adbf2f33dde525.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365656/normal_6045e69693848.pdfIn PDF document text
    • https://bujubisagakib.weebly.com/uploads/1/3/4/3/134323903/riwitiwexizif_voketewivo_zavana_jerep.pdfIn PDF document text
    • https://xasigusuvenazuj.weebly.com/uploads/1/3/0/7/130739755/a3dbc0658f24f38.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413347/normal_6001e38396b93.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454973/normal_5fd6239ab055e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416131/normal_60527f0f9bad4.pdfIn PDF document text
    • https://sugelama.weebly.com/uploads/1/3/4/8/134898925/2856033.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414851/normal_606131c54f737.pdfIn PDF document text
    • https://kobizixudowizeb.weebly.com/uploads/1/3/4/4/134402546/95f8b0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473947/normal_60403dd4815f1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • https://s3.amazonaws.com/geradi/titakisu.pdfIn PDF document text
    • https://s3.amazonaws.com/wibadinavosunom/respiracin_aerobia_y_anaerobia.pdfIn PDF document text
    • https://s3.amazonaws.com/zasepo/alexa_app_for_windows_8._1.pdfIn PDF document text
    • https://s3.amazonaws.com/fizup/formal_letter_for_job_promotion.pdfIn PDF document text
    • https://s3.amazonaws.com/nitirew/kidde_kn-coeg-3_instructions.pdfIn PDF document text
    • https://s3.amazonaws.com/daxemo/office_365_business_premium_azure_rights_management.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
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB4C 5120 bytes
SHA-256: 400763e6e2c5ad6cbb2af716166216b5c48af76453134ee76c818ab13addfe26
font_01_sfnt_off0000fcb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB7 6044 bytes
SHA-256: 083dbae029c4de47ac63fef7e774980313a00ffc4527a7f11972c88a012a9605
font_02_sfnt_off00010c53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C53 10684 bytes
SHA-256: 84215a882106c292ad6d2023beed4d732f6371c393aa204f112458c8d416379a