Malicious PDF — malware analysis report

Static analysis result for SHA-256 b54e09621bd17659…

MALICIOUS

PDF

77.4 KB Created: 2021-05-05 20:10:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b5b0575c0c819af16bc9ae0b6ce5f204 SHA-1: 7928e7b936f48c517b6ebca7641a36468ed52c96 SHA-256: b54e09621bd17659fa7904a387f866804b91675132750b968cfc36cdf8a062f8
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a large number of external links, suggesting a link farm or phishing attempt, with one prominent URL being https://kuzutuzo.ru/strik. The document body, though heavily obfuscated, appears to be a lure related to 'Painting canvas art lesson'. No scripts were extracted, but the presence of numerous external links points towards a redirection or phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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
  • 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/strik?utm_term=painting+canvas+art+lesson
    • https://pejilajapife.weebly.com/uploads/1/3/4/4/134477767/5425419.pdf
    • https://malalufapavi.weebly.com/uploads/1/3/4/4/134481779/xogukiwufiwotoj_jaziwufiluba_guxotanoravune.pdf
    • https://rafanubenab.weebly.com/uploads/1/3/4/7/134747024/dobovuliramilom_lazenogixowef.pdf
    • https://jadegivi.weebly.com/uploads/1/3/4/8/134851053/69ed54a32103f79.pdf
    • https://gugajapu.weebly.com/uploads/1/3/5/3/135330564/3388744.pdf
    • https://juxilejaguzu.weebly.com/uploads/1/3/4/4/134404551/8982018.pdf
    • https://dizufarul.weebly.com/uploads/1/3/1/3/131379939/kenofog_jogilusijaz_rodipagu_safumogeke.pdf
    • https://tuberosaguxe.weebly.com/uploads/1/3/1/4/131437792/bakuzas.pdf
    • https://nuvutujozexavu.weebly.com/uploads/1/3/4/1/134131277/4497331.pdf
    • https://pojasulexubu.weebly.com/uploads/1/3/5/9/135993084/bb428fe430e5310.pdf
    • https://kiteginizi.weebly.com/uploads/1/3/1/8/131871518/visasumulavo.pdf
    • https://litukepulaj.weebly.com/uploads/1/3/4/8/134863372/9745811.pdf
    • https://segukikiregitep.weebly.com/uploads/1/3/1/8/131856439/soxadivudodutelagep.pdf
    • https://pisexenileket.weebly.com/uploads/1/3/5/3/135350899/ligufubutiwa-korapiramejowud-kelovegadut-zuzuzigufexiji.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/lixisariwulo/sivivupawisuxij.pdf
    • https://s3.amazonaws.com/tuxalowafokuvo/27973501128.pdf
    • https://s3.amazonaws.com/towakog/wokaxejifa.pdf
    • https://s3.amazonaws.com/zozuxukoxo/honda_pioneer_1000-5_for_sale_arkansas.pdf
    • https://s3.amazonaws.com/sedowedi/daily_planner_template_for_mac_pages.pdf
    • https://s3.amazonaws.com/lakujusitejojet/22162251891.pdf
    • https://s3.amazonaws.com/tetofamuxulil/chaucer_canterbury_tales_worksheet.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_off0000f1d6.bin
ca036f8de6aee9eda33ef8a24eb19767981ca0edec76f0e5456b4f0b5c8999e3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D6 5028 bytes
font_01_sfnt_off0001030b.bin
a7e1f5975f5fd75e99a27917feb62a6def94ac89a302d9e24e4313e03d9738fa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1030B 11052 bytes

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