Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f354d12922aee9b…

MALICIOUS

PDF

72.6 KB Created: 2021-02-28 05:42:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f97d0ffec87a5ada88e9a036b6eedc1b SHA-1: 7b2638a96490e7ebc50bb81bfe7ac47259d9e31f SHA-256: 6f354d12922aee9b57f57459239039f47e784df4541a4749f11a62c2b9407220
164 Risk Score

Malware Insights

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

The PDF file contains numerous external links, flagged as a 'PDF_SEO_LINK_FARM', suggesting a tactic to distribute malicious content or phish for information. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. The embedded links, such as 'https://kuzutuzo.ru/wix?keyword=hidden+valley+middle+school+staff+directory', are used to disguise the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/wix?keyword=hidden+valley+middle+school+staff+directory
    • https://mizewipexu.weebly.com/uploads/1/3/4/6/134609608/a7b963b655a2d4b.pdf
    • https://vijopafixav.weebly.com/uploads/1/3/1/6/131636601/xorawuduxo_furizu_lowumibigip_vogibesalaboxo.pdf
    • http://fisujerekuvij.getenjoyment.net/disney_world_attraction_refurbishment_schedule.pdf
    • http://ziwefewixus.iblogger.org/context_clues_worksheets_for_grade_8.pdf
    • https://cdn-cms.f-static.net/uploads/4464702/normal_6037baab8f015.pdf
    • https://xososikanezav.weebly.com/uploads/1/3/4/8/134892973/1afcc.pdf
    • https://cdn-cms.f-static.net/uploads/4479462/normal_602b6c5e5b2ca.pdf
    • https://lilalosemojuwo.weebly.com/uploads/1/3/0/8/130814601/7411604.pdf
    • https://tatogupuragafa.weebly.com/uploads/1/3/4/0/134096405/5511864.pdf
    • https://fesoviso.weebly.com/uploads/1/3/4/7/134710514/bamunelasibaf.pdf
    • http://wusapibixabupak.iblogger.org/jiselegutitiza.pdf
    • https://xovigojimere.weebly.com/uploads/1/3/4/8/134854331/vavokofefomilinib.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://vaguxupinirulop.epizy.com/biboj.pdf
    • http://wubujuf.rf.gd/martin_luther_king_quote_the_ultimate_measure_of_a_man.pdf
    • http://gapojegutebu.rf.gd/brute_lawn_mower_parts.pdf
    • http://zekakodususebu.epizy.com/recyclerview_android_example_with_image.pdf
    • http://pamerugug.epizy.com/49117537197.pdf
    • http://tiwatimab.atwebpages.com/61859218700.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfda.bin
5e6e21171841f97bd7899465837bbd5c63c15f200f4010b0c2a820f2ee02d84d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDFDA 5384 bytes
font_01_sfnt_off0000f209.bin
499652c0c3c4d058485773bdebc994b2f5ad596141b5badab0067a4b876b7104		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF209 10308 bytes

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