Malicious PDF — malware analysis report

Static analysis result for SHA-256 b41ba46c923fb57d…

MALICIOUS

PDF

33.9 KB Created: 2020-06-16 13:44:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2082ba54bea153fbfdc84025bd351876 SHA-1: f0c5f5ba8eca3021937c829d1945dc20df41ec45 SHA-256: b41ba46c923fb57d587b60a869a91e4b4dbfb4653e957c1c5735b0f2fb05f7f5
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.001 PowerShell

The PDF document contains a large number of external links to other PDF files hosted on various domains. This pattern is indicative of SEO poisoning or a link farm designed to distribute malicious content or redirect users to phishing sites. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent. No scripts were extracted, limiting the analysis of specific execution behaviors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 4

  • 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.
  • 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://imfrida.com/uploads/1/3/0/4/130491947/130491947.html#nicole+french+exercise+physiologist
    • http://hyunsookimmedia.com/uploads/1/3/0/6/130604088/6051488.pdf
    • http://longacrefoods.com/uploads/1/3/0/2/130288307/wotobetowif.pdf
    • http://brvndaprl.shop/uploads/1/3/1/4/131437276/d89041ab53227.pdf
    • http://keto2u.org/uploads/1/3/0/7/130775029/1929408.pdf
    • http://shadesofgreylive.com/uploads/1/3/1/4/131407395/rejunuxuv-duturum-fesevoxo-neriru.pdf
    • http://fleekstreets.com/uploads/1/3/0/8/130813851/9498428.pdf
    • http://kometaniassociates.com/uploads/1/3/1/3/131383726/midujegupukunotij.pdf
    • http://southwindtrading.com/uploads/1/3/0/7/130775903/b18acbf20ec87.pdf
    • http://completecarpetrecovery.com/uploads/1/3/0/2/130289254/rafovulo_badovigaxigirak_jobesokidixapob.pdf
    • http://haitianchristianchurchaz.com/uploads/1/3/1/8/131857586/gamesotesaniburuvi.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_off00005a23.bin
82bc3e911b2038cc3934b87f502c9b8ff5e2727739fb9c144149ae5a11d5ab23		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A23 10188 bytes

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