Malicious PDF — malware analysis report

Static analysis result for SHA-256 774f442f88986c13…

MALICIOUS

PDF

72.6 KB Created: 2021-01-28 22:41:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 50a7fb967137273ccd61fc49a9adf6db SHA-1: c70f9c447f509111bacebb2e5ec888f9684d41f4 SHA-256: 774f442f88986c132cd153bdcf9db90f5cd3a4667d7889996f268e94a86a5ea6
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate maliciousness. The embedded URL 'https://jottigo.ru/123?utm_term=two+trexes+fighting+over+a+saw' is a primary indicator of the malicious content.

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 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.
  • 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/123?utm_term=two+trexes+fighting+over+a+saw PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4384652/normal_600cf4fae3d62.pdfIn PDF document text
    • http://urott-hu.com/full_wave_bridge_rectifier_operationk8uom.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478408/normal_5fc75462e145b.pdfIn PDF document text
    • http://gajozemexip.22web.org/mixed_aldol_condensation.pdfIn PDF document text
    • https://putigored.weebly.com/uploads/1/3/0/7/130738503/633196.pdfIn PDF document text
    • http://spiritstudio.ru/dunkaroos_2020_ingredientszq3gi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446398/normal_5fd76af950bf3.pdfIn PDF document text
    • http://lunesygets.xyz/912575090988pt87.pdfIn PDF document text
    • https://kujufilobi.weebly.com/uploads/1/3/1/4/131482850/falufiximewobok.pdfIn PDF document text
    • https://gopaposoxawa.weebly.com/uploads/1/3/0/7/130740193/rimakudoruxiwogas.pdfIn PDF document text
    • https://xegezegev.weebly.com/uploads/1/3/2/6/132683484/pejiwod.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tinezedu/the_algorithm_design_manual_2nd_edition_solutions.pdfIn PDF document text
    • https://s3.amazonaws.com/xupimaral/42567568414.pdfIn PDF document text
    • https://s3.amazonaws.com/liwafo/makesakoxifofegi.pdfIn PDF document text
    • https://s3.amazonaws.com/bulikowexunepov/bga_full_form_in_mobile.pdfIn PDF document text
    • http://renirujetumofid.epizy.com/23335061694.pdfIn PDF document text
    • https://s3.amazonaws.com/jepinebawo/clothes_worksheet_for_preschool.pdfIn PDF document text
    • http://rubaporejolo.rf.gd/pezugexedumojekadixo.pdfIn PDF document text
    • https://s3.amazonaws.com/ropuba/gp_m_trong_m_sheet.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_off0000da3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA3F 5164 bytes
SHA-256: b1fe0bf1f45eebc0ab5fbf5257416196e82d9de0feda48111f9c084d0e5d043f
font_01_sfnt_off0000ebe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE9 12080 bytes
SHA-256: 3c82760fdf8829a2e5e25f1709e136e9ce3a035c8bd956b1c1de1a3d29f64724