Malicious PDF — malware analysis report

Static analysis result for SHA-256 d046f2fbc912cd77…

MALICIOUS

PDF

78.2 KB Created: 2021-03-14 23:56:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: eb8fd8ed349e9eab0a18e1fa9ad2fba3 SHA-1: 180912571ae9fa8df5b8741b2f67242e0d7ae216 SHA-256: d046f2fbc912cd7745da8f938c3b0c33139eb8022bb6f499502779d35c9a6147
216 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 SEO-themed, suggesting a link farm designed to distribute malicious content. The heuristic 'SE_SECRET_RECOVERY_LURE' indicates the document may also attempt to trick users into revealing sensitive information. ClamAV detection and ML classification confirm the malicious nature of the file, likely acting as a downloader for further stages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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.
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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/award?keyword=ccna+security+study+guide+exam+210+260+troy+mcmillan+pdf PDF link annotation
    • https://kuxobemif.weebly.com/uploads/1/3/1/3/131379353/lobuxejun.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367313/normal_5feb8ab2770db.pdfIn PDF document text
    • http://xisumagogali.getenjoyment.net/trueman_s_elementary_biology_book.pdfIn PDF document text
    • https://zovamegazojuji.weebly.com/uploads/1/3/4/8/134849063/zevarugu.pdfIn PDF document text
    • http://xowimixipivup.22web.org/english_quotes_about_life.pdfIn PDF document text
    • https://lufukosiresefo.weebly.com/uploads/1/3/4/7/134707539/5042289.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478927/normal_6013da56c3c97.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421061/normal_5ffb17ff8222f.pdfIn PDF document text
    • http://nuloriwilorij.scienceontheweb.net/cygolite_hotshot_pro_150_usb_rechargeable_tail_lights.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lofuwokapowudug.rf.gd/welesukiluponi.pdfIn PDF document text
    • https://s3.amazonaws.com/nosepevozux/58386451855.pdfIn PDF document text
    • http://kozusabupo.epizy.com/evolution_of_built_environment.pdfIn PDF document text
    • https://s3.amazonaws.com/sefipa/wavakewuxatameloxizum.pdfIn PDF document text
    • https://s3.amazonaws.com/jeduzizonox/answer_key_nda_2018_1.pdfIn PDF document text
    • https://s3.amazonaws.com/kumasala/58678720001.pdfIn PDF document text
    • https://s3.amazonaws.com/vuzotisenixava/xuvunilego.pdfIn PDF document text
    • https://s3.amazonaws.com/kujesulad/vascular_malformation_in_child_s_leg.pdfIn PDF document text
    • https://s3.amazonaws.com/falevi/nunoki.pdfIn PDF document text
    • https://s3.amazonaws.com/bejokazemur/how_to_troubleshoot_an_rv_ac_unit.pdfIn PDF document text
    • https://s3.amazonaws.com/mogedozara/life_after_english_version_apk_free.pdfIn PDF document text
    • https://s3.amazonaws.com/dukajevo/53670398718.pdfIn PDF document text
    • http://jemileti.atwebpages.com/kojusi.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_off0000f374.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF374 6028 bytes
SHA-256: 52ce971b2f8b6d6f858df6171be78f11039f374f5c25cc36d79caa37e7cf431b
font_01_sfnt_off000107f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107F8 10568 bytes
SHA-256: 662fe0419c1a3a08ff8df8a5a171177ab867889974ef7a0635e95e0b61e1fea8

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