Malicious PDF — malware analysis report

Static analysis result for SHA-256 408da8747ce2a5b4…

MALICIOUS

PDF

81.8 KB Created: 2021-03-17 22:02:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 01dcac6edaf78533742934fddc584ac1 SHA-1: 9b366f960d2e429533751ba7ea024925f57d2970 SHA-256: 408da8747ce2a5b47d867971cc4657fbecbd928eb61c0b62f7a41a873d0b412d
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically pointing to 'kuzutuzo.ru', indicating a likely phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further suggests the document is designed to host many links, potentially to obscure malicious activity. Although no scripts were explicitly extracted, the ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the exploitation of PDF vulnerabilities or social engineering.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 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://kuzutuzo.ru/123?utm_term=x+plane+11+bombardier+challenger+300 PDF link annotation
    • https://pezilesuwubev.weebly.com/uploads/1/3/4/6/134639222/koweleralijawodatup.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365589/normal_5fe44f79ea874.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474978/normal_60187c355b1a0.pdfIn PDF document text
    • https://sufimademum.weebly.com/uploads/1/3/4/2/134236216/rakozatuwavufum.pdfIn PDF document text
    • http://citimart.online/android_7._0_frp_bypass_apkdqvis.pdfIn PDF document text
    • http://nutunajika.66ghz.com/webojufojebuzuxa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404725/normal_5ff3f028d0aa8.pdfIn PDF document text
    • http://easylearning.space/accomplishment_report_for_teachers_dayevi7l.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454167/normal_5ff631861978d.pdfIn PDF document text
    • https://vuguzakinizole.weebly.com/uploads/1/3/4/4/134493236/71b2e6fdbe085.pdfIn PDF document text
    • http://sayfelengs.space/mp4_cheer_up_hong_jin_young1p3xi.pdfIn PDF document text
    • http://comforfemj.fun/sulisekimivilez5wqec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415304/normal_60520d39dc3d9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454419/normal_6016931c0b8af.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465701/normal_603c1aeb30756.pdfIn PDF document text
    • http://boviriso.22web.org/pumigasu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378386/normal_5fd9a29066691.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404308/normal_5fd0dcf3abd60.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/wupiwupiwot/free_lagu_bloodshed_srikandi_cintaku.pdfIn PDF document text
    • http://dalezogidaxi.epizy.com/68439611295.pdfIn PDF document text
    • https://s3.amazonaws.com/rizezobabub/57908518497.pdfIn PDF document text
    • https://s3.amazonaws.com/dudujopixejikug/71247263712.pdfIn PDF document text
    • https://s3.amazonaws.com/fumiposamisur/adobe_reader_viewer_chrome.pdfIn PDF document text
    • https://s3.amazonaws.com/widofafane/12223445503.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_off00010022.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10022 5784 bytes
SHA-256: 9506e16720891afdde853be94d796cea95faf0f6afe968960494236408c35e83
font_01_sfnt_off000113a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113A7 10704 bytes
SHA-256: 1a1bca37cf8de929ee82be9c06814e4b8b5e9fcb05a043b2d6784d148903e562

Open this report in the interactive analyzer, or submit your own file for analysis.