Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6fbf028f64fab7b…

MALICIOUS

PDF

74.6 KB Created: 2021-04-02 09:43:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cad6c264a20af16cff62b830f877e411 SHA-1: 19c2b4a1b7287b7dbab17257faddf37e1adc4769 SHA-256: b6fbf028f64fab7b72db6b6c5806d8432880da3ea0a4cceb520a81579dd949ca
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains heuristics indicating it is a phishing lure, specifically prompting the user to install a browser extension or update. It also contains numerous external links, suggesting a link farm or redirection to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to deliver a secondary payload or steal credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://mezovuduw.ru/wix?keyword=chrome+older+version+offline+installer
    • https://gunujudota.weebly.com/uploads/1/3/2/3/132303168/zaxutotibenebenulor.pdf
    • https://mugojilakifev.weebly.com/uploads/1/3/4/5/134510671/ca2ee69074.pdf
    • https://nudozulewofofij.weebly.com/uploads/1/3/4/7/134711849/2c994.pdf
    • https://fujulisu.weebly.com/uploads/1/3/4/0/134042697/8934199.pdf
    • https://rebodegumirimak.weebly.com/uploads/1/3/0/7/130775130/5932668.pdf
    • https://cdn.sqhk.co/limiwebu/e0Matjg/togoxomuxixa.pdf
    • https://cdn-cms.f-static.net/uploads/4383912/normal_6046392c8fc17.pdf
    • http://pigofumibimu.iblogger.org/sotudivikiluditek.pdf
    • https://kupelaranix.weebly.com/uploads/1/3/4/7/134729830/4828433.pdf
    • https://static.s123-cdn-static.com/uploads/4387573/normal_5ffe092131d1b.pdf
    • https://munemajof.weebly.com/uploads/1/3/2/3/132302982/kivolunato.pdf
    • https://soluvixam.weebly.com/uploads/1/3/0/8/130873975/jalamitebefabapereka.pdf
    • https://rozusuwiloguf.weebly.com/uploads/1/3/4/6/134644861/bewifarofatemox.pdf
    • https://cdn.sqhk.co/rufopunuk/eoNhePb/48152108069.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://xifogufog.epizy.com/beard_style_guide.pdf
    • http://kuvonukuwe.epizy.com/earthwise_lawn_mower_replacement_blade.pdf
    • http://josusasufuni.epizy.com/alexander_movie_in_tamil_hd.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_off0000e46b.bin
dd7598c1dd58799388ce3645e04755b7d9ae9bf8ff8c2114a09cff191148f7f9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE46B 5112 bytes
font_01_sfnt_off0000f5a1.bin
b5c9d65b742d6ec3786fc3eb7150fcc8b07578994c191a4ab06a15514bd1c40f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A1 11184 bytes

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