Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f07505e45b8d581…

MALICIOUS

PDF

31.6 KB Created: 2020-04-25 04:49:25 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: b31618218662bbce81fefdf3efe0d29f SHA-1: f41c4f47e54c470628515f7cd42934894028d8e9 SHA-256: 5f07505e45b8d58195cbc8a0c0ec12062aedb5e2bedcbedac3abe64be8b21e71
156 Risk Score

Malware Insights

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

This PDF document was identified as malicious by ClamAV and an ML classifier, indicating it functions as a dropper. It contains numerous external links, suggesting a link farm or SEO manipulation tactic to distribute further malicious content. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly suggest the document's primary purpose is to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.Dropper.Agent-9252546-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Dropper.Agent-9252546-0
  • 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 http://lubeauty.co/uploads/1/3/0/7/130738963/130738963.html#frette+sheets+online
    • http://inusak.com/uploads/1/3/1/4/131453421/7418528.pdf
    • http://powerfarmmachine.com/uploads/1/3/1/1/131164281/nabodorodadob-nadugab-susenixixan-resimurab.pdf
    • http://mandmwoodcrafts.com/uploads/1/3/0/5/130588214/2461266.pdf
    • http://jbopal.com/uploads/1/3/0/8/130874573/duporikixesore.pdf
    • http://larrylovescannabis.com/uploads/1/3/0/5/130589165/37a5cf0.pdf
    • http://eventgroundandlodging.com/uploads/1/3/0/8/130874339/6480504.pdf
    • http://avocadoandarugula.com/uploads/1/3/0/2/130271116/5584507.pdf
    • http://pintanbastos.net/uploads/1/3/0/5/130543764/regodu.pdf
    • http://406tech.net/uploads/1/3/0/4/130479008/1469633.pdf
    • http://winnerschoiceawards.net/uploads/1/3/1/4/131438304/pavomigo.pdf
    • http://rheacafeandgrill.com/uploads/1/3/0/6/130640142/xeropubobumidopava.pdf
    • http://opti-illusions.net/uploads/1/3/1/6/131636872/sejolinegapazed.pdf
    • http://mamaafricaangel.com/uploads/1/3/0/3/130323709/8327080.pdf
    • http://sexyshineauto.com/uploads/1/3/1/4/131406610/7393c8a464e31.pdf
    • http://timwagnerperforms.com/uploads/1/3/0/3/130323633/84b05781e6ec58.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/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000056c3.bin
2dbc81b9fac41e1bc3b48997d38ceb173424e44fb935b4b194a7c2208c8c03d7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x56C3 6992 bytes

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