Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdbcbd453e47854b…

MALICIOUS

PDF

77.2 KB Created: 2021-03-25 17:25:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 5db2da8f11a330734645d175589db444 SHA-1: 2903d6aeac55e3b5dd154bac28d411a4c91bc239 SHA-256: fdbcbd453e47854b718c0b4e20a21fbe731e4f9bc85e040d62d0609506b55345
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are to SEO-optimized PDF hosting sites, suggesting a link farm or spamming operation. One prominent URL, 'https://resalured.ru/strik?utm_term=how+to+get+latitude+and+longitude+on+google+maps+api', is directly embedded and likely leads to a malicious site. The ML classifier and ClamAV detection strongly indicate malicious intent, consistent with phishing or scamming activities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://resalured.ru/strik?utm_term=how+to+get+latitude+and+longitude+on+google+maps+api PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4465941/normal_6026d5d46708e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450641/normal_600f1a0323f7b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465398/normal_603813de583ab.pdfIn PDF document text
    • http://floradoma.net/dalata_group_annual_reportw4kip.pdfIn PDF document text
    • http://mebelintera.ru/gubavelejocdsr8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467593/normal_605a11fd6c70d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384817/normal_5fdef8c1149b0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453532/normal_5ff374b9b1cc8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462093/normal_605041fd5b45b.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/sewamos/new_video_songs_tamil_2019.pdfIn PDF document text
    • https://be9ca920-c372-4566-b00d-544f92814f3b.filesusr.com/ugd/f0c5a9_10e0539a63c34d66915e2ae9d8c67215.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sezebepit/siwagunik.pdfIn PDF document text
    • https://f3c4034a-4a94-4c47-b6c5-0445626d7bf8.filesusr.com/ugd/655f09_faae7591d5ae4de79ac8bf2c6dfcfcec.pdf?index=trueIn PDF document text
    • https://cceb078e-1df6-42b0-9e12-359f30e42f1d.filesusr.com/ugd/e8506d_6b7df7ab41914b04b36ccf8d352fcaf5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pusolefosex/konunovifa.pdfIn PDF document text
    • https://53002a68-e35f-4167-ac88-1ab9777d7e72.filesusr.com/ugd/f5bc2a_5df647d397994cd18ffc4ac326703625.pdf?index=trueIn PDF document text
    • https://f770b3d7-c897-40e0-9323-5ad0abd91552.filesusr.com/ugd/1fa6dd_f0b375c50858426285d89c90212ff4d6.pdf?index=trueIn PDF document text
    • https://19d8af67-ac20-4a7c-8ffd-69be953788a8.filesusr.com/ugd/578741_ff0c8186c9684b929dd4e2435a99c63f.pdf?index=trueIn PDF document text
    • https://c4fca8c4-0f54-45c3-ae88-320069d86c16.filesusr.com/ugd/ac0d21_c0f81748440a433981c7b90befe5f280.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nitajosasa/bugelataxupofamipifu.pdfIn PDF document text
    • https://45ed8376-e832-497f-ab20-0a31924dc5db.filesusr.com/ugd/4b7290_4710e00a6ddd41e4abf58d95e998b002.pdf?index=trueIn PDF document text
    • https://a97be2a3-bfb5-42de-bba9-b145341b31aa.filesusr.com/ugd/1f2860_5bd30401029e4997b2759175be2bbbdd.pdf?index=trueIn 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_off0000f099.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF099 5236 bytes
SHA-256: 24abb44febd46a5ce01336f31674f376194c4f132d31f0b0b4a636a634ab70e0
font_01_sfnt_off00010270.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10270 10796 bytes
SHA-256: d0b7a5a168cfafe9a7c312da493343d3b891cf244bb2d29ce1c91af0c9664bf1

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